Gareth Chisham

Space Weather Researcher

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Gareth Chisham

Space Weather Researcher

Biography

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I am a Space Weather researcher in the Space Weather and Atmosphere Team at BAS with extensive experience working in upper atmosphere/space science.

My areas of expertise include:

The calibration, analysis and interpretation of SuperDARN HF radar observations of the ionosphere.
Solar wind – magnetosphere – ionosphere coupling.
The effects of space weather on Joule heating and satellite drag.
Solar variability effects on weather and climate via the effect of the global atmospheric electric circuit.

Highlights of my research include:

The use of SuperDARN electric field measurements to remotely sense the rate of magnetic reconnection at the Earth’s magnetopause during different interplanetary magnetic field conditions.
Developing new techniques to accurately identify the open-closed magnetic field line boundary using SuperDARN radar measurements of the ionosphere and spacecraft ultra-violet imager observations of auroral emissions in the ionosphere.
I have 20 years experience in developing models and data analysis products using SuperDARN data, such as new techniques to measure ionospheric vorticity and accurately map SuperDARN observations.

I am presently the PI for the BAS SuperDARN radars located at Halley and in the Falkland Islands.

Walker, S.J., Laundal, K.M., Reistad, J.P., Ohma, A., Hatch, S.M., Chisham, G., and Decotte, M., A comparison of auroral oval proxies with the boundaries of the auroral electrojets. Space Weather, 22, e2023SW003689, 2024.

Chisham, G., Kavanagh, A.J., Cobbett, N., Breen, P., and Barnes, T., High-time-resolution analysis of meridional tides in the upper mesosphere and lower thermosphere at mid-latitudes measured by the Falkland Islands SuperDARN radar. Ann. Geophys., 42, 1-15, 2024.

Carter, J.A., Dunlop, M., Forsyth, C., Oksavik, K., Donovan, E., Kavanagh, A., Milan, S.E., Sergienko, T., Fear, R.C., Sibeck, D.G., Connors, M., Yeoman, T., Tan, X., Taylor, M.G.G.T., McWilliams, K., Gjerloev, J., Barnes, R., Billet, D.D., Chisham, G., Dimmock, A., Freeman, M.P., Han, D.-S., Hartinger, M.D., Hsieh, S.-Y.W., Hu, Z.-J., James, M.K., Juusola, L., Kauristie, K., Kronberg, E.A., Lester, M., Manuel, J., Matzka, J., McCrea, I., Miyoshi, Y., Rae, J., Ren, L., Sigernes, F., Spanswick, E., Sterne, K., Steuwer, A., Sun, T., Walach, M.-T., Walsh, B., Wang, C., Weygand, J., Wild, J., Yan, J., Zhang, J., and Zhang, Q.-H., Ground-based and additional science support for SMILE. Earth and Planetary Physics, 8, 275-298, 2024.

Coxon, J.C., Chisham, G., Freeman, M.P., Forsyth, C., Walach, M.-T., Murphy, K.R., Vines, S.K., Anderson, B.J., Smith, A.W., and Fogg, A.R., Extreme Birkeland currents are more likely during geomagnetic storms on the dayside of the Earth. J. Geophys. Res., 128, e2023JA031946, 2023.

Chisham, G., and Freeman, M.P., Separating contributions to plasma vorticity in the high-latitude ionosphere from large-scale convection and meso-scale turbulence. J. Geophys. Res., 128, e2023JA031885, 2023.

Lam, M.M., Shore, R.M., Chisham, G., Freeman, M.P., Grocott, A., Walach, M.-T., and Orr, L., A model of high latitude ionospheric convection derived from SuperDARN EOF model data. Space Weather, 21, e2023SW003428, 2023.

Orr, L., Grocott, A., Walach, M.-T., Chisham, G., Freeman, M.P., Lam, M.M., and Shore, R.M., A quantitative comparison of high latitude electric field models during a large geomagnetic storm. Space Weather, 21, e2022SW003301, 2023.

Chisham, G., Burrell, A.G., Thomas, E.G., and Chen, Y.-J., Ionospheric boundaries derived from auroral images. J. Geophys. Res., 127, e2022JA030622, 2022.

Coxon, J.C., Chisham, G., Freeman, M.P., Anderson, B.J., and Fear, R.C., Distributions of Birkeland current density observed by AMPERE are heavy-tailed or long-tailed. J. Geophys. Res., 127, e2021JA029801, 2022.

Chisham, G., and Freeman, M.P., A statistical model of vorticity in the polar ionosphere and implications for extreme values. J. Geophys. Res., 126, e2021JA029307, 2021.

Mooney, M.K., Marsh, M.S., Forsyth, C., Sharpe, M., Hughes, T., Bingham, S., Jackson, D.R., Rae, I.J., and Chisham, G., Evaluating auroral forecasts against satellite observations. Space Weather, 19, e2020SW002688, 2021.

Shore, R.M., Freeman, M.P., and Chisham, G., Data-driven basis functions for SuperDARN ionospheric plasma flow characterization and prediction. J. Geophys. Res., 126, e2021JA029272, 2021.

Chisham, G., Burrell, A.G., Marchaudon, A., Shepherd, S.G., Thomas, E.G., and Ponomarenko, P., Comparison of interferometer calibration techniques for improved SuperDARN elevation angles. Polar Sci., 28, 100638, 2021.

Mooney, M.K., Forsyth, C., Rae, I.J., Chisham, G., Coxon, J.C., Marsh, M.S., Jackson, D.R., Bingham, S., and Hubert, B., Examining local time variations in the gains and losses of open magnetic flux during substorms. J. Geophys. Res., 125, e2019JA027369, 2020.

Burrell, A.G., Chisham, G., Milan, S.E., Kilcommons, L., Chen, Y.-J., Thomas, E.G., and Anderson, B., AMPERE polar cap boundaries. Ann. Geophys., 38, 481-490, 2020.

Nishitani, N., Ruohoniemi, J.M., Lester, M., Baker, J.B.H., Koustov, A.V., Shepherd, S.G., Chisham, G., Hori, T., Thomas, E.G., Makarevich, R.A., Marchaudon, A., Ponomarenko, P., Wild, J.A., Milan, S.E., Bristow, W.A., Devlin, J., Miller, E., Greenwald, R.A., Ogawa, T., and Kikuchi, T., Review of the accomplishments of mid-latitude Super Dual Auroral Radar Network (SuperDARN) HF radars. Prog. Earth Planet. Sci., 6:27, 2019.

Lam, M.M., Freeman, M.P., and Chisham, G., IMF-driven change to the Antarctic tropospheric temperature due to the global atmospheric electric circuit. J. Atmos. Sol. Terr. Phys., 180, 148-152, 2018.

Chisham, G., Calibrating SuperDARN interferometers using meteor backscatter. Radio Sci., 53, 761-774, 2018.

Chisham, G., A new methodology for the development of high-latitude ionospheric climatologies and empirical models. J. Geophys. Res., 122, 932-947, 2017.

Longden, N., Chisham, G., and Freeman, M.P., Magnetic local time variation and scaling of poleward auroral boundary dynamics. J. Geophys. Res., 119, 10,006-10,022, 2014.

Lam, M.M., Chisham, G., and Freeman, M.P., Solar wind-driven geopotential height anomalies originate in the Antarctic lower troposphere. Geophys. Res. Lett., 41, doi:10.1002/2014GL061421, 2014.

Milan, S.E., Grocott, A., de Larquier, S., Lester, M., Yeoman, T.K., Freeman, M.P., and Chisham, G., Travelling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity. J. Geophys. Res., 118, 6608-6617, 2013.

Lam, M.M., Chisham, G., and Freeman, M.P., The interplanetary magnetic field influences mid-latitude surface atmospheric pressure. Env. Res. Lett., 8, 045001, doi:10.1088/1748-9326/8/4/045001, 2013.

Chisham, G. and Freeman, M.P., A reassessment of SuperDARN meteor echoes from the upper mesosphere and lower thermosphere. J. Atmos. Sol. Terr. Phys., 102, 207-221, 2013.

Boakes, P.D., Milan, S.E., Abel, G.A., Freeman, M.P., Chisham, G., and Hubert, B., A superposed epoch investigation of the relation between magnetospheric solar wind driving and substorm dynamics with geosynchronous particle injection signatures. J. Geophys. Res., 116, A01214, doi:10.1029/2010JA016007, 2011.

Longden, N., Chisham, G., Freeman, M.P., Abel, G.A., and Sotirelis, T., Estimating the location of the open-closed magnetic field line boundary from auroral images. Ann. Geophys., 28, 1659-1678, 2010.

Chisham, G., and Freeman, M.P., On the non-Gaussian nature of ionospheric vorticity. Geophys. Res. Lett., 37, L12103, doi:10.1029/2010GL043714, 2010.

Abel, G.A., Freeman, M.P., and Chisham, G., IMF clock angle control of multifractality in ionospheric velocity fluctuations. Geophys. Res. Lett., 36, L19102, doi:10.1029/2009GL040336, 2009.

Chisham, G., Freeman, M.P., Abel, G.A., Bristow, W.A., Marchaudon, A., Ruohoniemi, J.M., and Sofko, G.J., Spatial distribution of average vorticity in the high-latitude ionosphere and its variation with interplanetary magnetic field direction and season. J. Geophys. Res., 114, A09301, doi:10.1029/2009JA014263, 2009.

Boakes, P.D., Milan, S.E., Abel, G.A., Freeman, M.P., Chisham, G., and Hubert, B., A statistical study of the open magnetic flux content of the magnetosphere at the time of substorm onset. Geophys. Res. Lett., 36, L04105, doi:10.1029/2008GL037059, 2009.

Boakes, P.D., Milan, S.E., Abel, G.A., Freeman, M.P., Chisham, G., Hubert, B., and Sotirelis,T., On the use of IMAGE FUV for estimating the latitude of the open/closed magnetic field line boundary in the ionosphere. Ann. Geophys., 26, 2759-2769, 2008.

Yeoman, T.K., Chisham, G., Baddeley, L.J., Dhillon, R.S., Karhunen, T.J.T., Robinson, T.R., Senior, A., and Wright, D.M., Mapping ionospheric backscatter measured by the SuperDARN HF radars, 2: Assessing SuperDARN virtual height models. Ann. Geophys., 26, 843-852, 2008.

Chisham, G., Yeoman, T.K., and Sofko, G.J., Mapping ionospheric backscatter measured by the SuperDARN HF radars, 1: A new empirical virtual height model. Ann. Geophys., 26, 823-841, 2008.

Chisham, G., Freeman, M.P., Abel, G.A., Lam, M.M., Pinnock, M., Coleman, I.J., Milan, S.E., Lester, M., Bristow, W.A., Greenwald, R.A., Sofko, G.J., and Villain, J.-P., Remote sensing of the spatial and temporal structure of magnetopause and magnetotail reconnection from the ionosphere. Rev. Geophys., 46, RG1004, doi:10.1029/2007RG000223, 2008.

Abel, G.A., Freeman, M.P., Chisham, G., and Watkins, N.W., Investigating turbulent structure of ionospheric plasma velocity using the Halley SuperDARN radar. Nonlin. Processes Geophys., 14, 799-809, 2007.

Chisham, G., Lester, M., Milan, S.E., Freeman, M.P., Bristow, W.A., Grocott, A., McWilliams, K.A., Ruohoniemi, J.M., Yeoman, T.K., Dyson, P.L., Greenwald, R.A., Kikuchi, T., Pinnock, M., Rash, J.P.S., Sato, N., Sofko, G.J., Villain, J.-P., and Walker, A.D.M., A decade of the Super Dual Auroral Radar Network (SuperDARN): Scientific achievements, new techniques and future directions. Surv. Geophys., 28, 33-109, 2007.

Freeman, M.P., Chisham, G., and Coleman, I.J., Remote sensing of reconnection, in Reconnection of Magnetic Fields, Eds. J. Birn and E. Priest, Cambridge University Press, pp.217-228, 2007.

Abel, G.A., Freeman, M.P., and Chisham, G., Spatial structure of ionospheric convection velocities in regions of open and closed magnetic field topology. Geophys. Res. Lett., 33, L24103, doi:10.1029/2006GL027919, 2006.

Chisham, G., Freeman, M.P., Lam, M.M., Abel, G.A., Sotirelis, T., Greenwald, R.A., and Lester, M., A statistical comparison of SuperDARN spectral width boundaries and DMSP particle precipitation boundaries in the afternoon sector ionosphere. Ann. Geophys., 23, 3645-3654, 2005.

Abel, G.A., Freeman, M.P. and Chisham, G., Comment on “Location of the reconnection line for northward interplanetary magnetic field” by K.J. Trattner, S.A. Fuselier, and S.M. Petrinec. J. Geophys. Res., 110, A10208, doi:10.1029/2004JA010973, 2005.

Chisham, G., Freeman, M.P., Sotirelis, T., and Greenwald, R.A., The accuracy of using the spectral width boundary measured in off-meridional SuperDARN HF radar beams as a proxy for the open-closed field line boundary. Ann. Geophys., 23, 2599-2604, 2005.

Chisham, G., New proxy for reconnection. Astronomy and Geophysics, 46, 4.23, 2005.

Chisham, G., Freeman, M.P., Sotirelis, T., Greenwald, R.A., Lester, M., and Villain, J.-P., A statistical comparison of SuperDARN spectral width boundaries and DMSP particle precipitation boundaries in the morning sector ionosphere. Ann. Geophys., 23, 733-743, 2005.

Chisham, G., Freeman, M.P., Coleman, I.J., Pinnock, M., Hairston, M.R., Lester, M., and Sofko, G., Measuring the dayside reconnection rate during an interval of due northward interplanetary magnetic field. Ann. Geophys., 22, 4243-4258, 2004.

Parkinson, M.L., Chisham, G., Pinnock, M., Dyson, P.L., and Devlin, J.C., Magnetic local time, substorm, and particle precipitation-related variations in the behaviour of SuperDARN Doppler spectral widths. Ann. Geophys., 22, 4103-4122, 2004.

Freeman, M.P. and Chisham, G., On the probability distributions of SuperDARN Doppler spectral width measurements inside and outside the cusp. Geophys. Res. Lett., 31, L22802, doi:10.1029/2004GL020923, 2004.

Chisham, G., Abel, G.A., and Milan, S.E., Whose field line is it anyway? Astronomy and Geophysics, 45,36-38, 2004.

Chisham, G. and Freeman, M.P., An investigation of latitudinal transitions in the SuperDARN Doppler spectral width parameter at different magnetic local times. Ann. Geophys., 22, 1187-1202, 2004.

Chisham, G., Freeman, M.P., and Sotirelis, T., A statistical comparison of SuperDARN spectral width boundaries and DMSP particle precipitation boundaries in the nightside ionosphere. Geophys. Res. Lett., 31, L02804, doi:10.1029/2003GL019074, 2004.

Pinnock, M., Chisham, G., Coleman, I.J, Freeman, M.P., Hairston, M.R., and Villain, J.-P., The location and rate of dayside reconnection during an interval of southward interplanetary magnetic field. Ann. Geophys., 21, 1467-1482, 2003.

Coleman, I.J, Chisham, G., Pinnock, M., and Freeman, M.P., Reply to comment by S.M. Petrinec and S.A. Fuselier on “An ionospheric convection signature of antiparallel reconnection”. J. Geophys. Res., 108, 1178, doi:10.1029/2002JA009568, 2003.

Chisham, G., and Freeman, M.P., A technique for accurately determining the cusp-region polar cap boundary using SuperDARN HF radar measurements. Ann. Geophys., 21, 983-996, 2003.

Rodger, A.S., Chisham, G., Coleman, I.J., Freeman, M.P., and Pinnock, M., Anti-parallel reconnection at the dayside magnetopause: Ionospheric signatures and implications for the low latitude boundary layer. Earth’s Low-Latitude Boundary Layer, Geophys. Monograph 133, AGU, 2003.

Chisham, G., Coleman, I.J., Freeman, M.P., Pinnock, M., and Lester, M., Ionospheric signatures of split reconnection X-lines during conditions of IMF Bz<0 and |By|~|Bz|: Evidence for the anti-parallel merging hypothesis. J. Geophys. Res., 107, 1323, doi:10.1029/2001JA009124, 2002.

Chisham, G., Pinnock, M., Coleman, I.J., Hairston, M.R., and Walker, A.D.M., An unusual geometry of the ionospheric signature of the cusp: Implications for magnetopause merging sites. Ann. Geophys., 20, 29-40, 2002.

Chisham, G. and Pinnock, M., Assessing the contamination of SuperDARN global convection maps by non-F-region backscatter. Ann. Geophys., 20, 13-28, 2002.

Coleman, I.J., Chisham, G., Pinnock, M. and Freeman, M.P., An ionospheric signature of antiparallel reconnection. J. Geophys. Res., 106, 28,995-29,007, 2001.

Chisham, G., Pinnock, M. and Rodger, A.S., The response of the HF radar spectral width boundary to a switch in the IMF By direction: Ionospheric consequences of transient dayside reconnection? J. Geophys. Res., 106, 191-202, 2001.

Chisham, G., Pinnock, M. and Rodger, A.S., Poleward-moving HF radar flow bursts in the cusp: Transient changes in flow speed or direction? Geophys. Res. Lett., 27, 919-922, 2000.

Chisham, G., Pinnock, M., Rodger, A.S. and Villain, J.-P., High-time resolution conjugate SuperDARN radar observations of the dayside convection response to changes in IMF By. Ann. Geophys., 18, 191-201, 2000.

Mann, I.R. and Chisham, G., Comment on “Concerning the generation of geomagnetic giant pulsations by drift-bounce resonance ring current instabilities” by K.-H. Glassmeier et al., Ann. Geophysicae, 17, 338-350, (1999). Ann. Geophys., 18, 161-166, 2000.

Chisham, G., Schwartz, S.J., Burgess, D., Bale, S.D., Dunlop, M.W. and Russell, C.T., Multi-satellite observations of large magnetic depressions in the solar wind. J. Geophys. Res., 105, 2325-2335, 2000.

Chisham, G. and Mann, I.R., A Pc5 ULF wave with large azimuthal wavenumber observed within the morning sector plasmasphere by Sub-Auroral Magnetometer Network. J. Geophys. Res., 104, 14,717-14,727, 1999.

Mann, I.R., Chisham, G. and Wanliss, J.A., Frequency-doubled density perturbations driven by ULF pulsations. J. Geophys. Res., 104, 4559-4565, 1999.

Chisham, G., Schwartz, S.J., Balikhin, M.A. and Dunlop, M.W., AMPTE observations of mirror mode waves in the magnetosheath: Wavevector determination. J. Geophys. Res., 104, 437-447, 1999.

Chisham, G., Burgess, D., Schwartz, S.J. and Dunlop, M.W., Observations of electron distributions in magnetosheath mirror mode waves. J. Geophys. Res., 103, 26,765-26,774. 1998.

Mann, I.R., Chisham, G. and Bale, S.D., Multisatellite and ground-based observations of a tailward propagating Pc5 magnetospheric waveguide mode. J. Geophys. Res., 103, 4657-4669, 1998.

Bale, S.D., Chisham, G., Burgess, D. and Schwartz, S.J., Langmuir wave amplitudes and the electron distribution function near the solar wind-foreshock boundary. Adv. Space Res., 20, (4/5)695-(4/5)698, 1997.

Chisham, G. and Orr, D., A statistical study of the local time asymmetry of Pc5 ULF wave characteristics observed at mid-latitudes by SAMNET. J. Geophys. Res., 102, 24,339-24,350, 1997.

Chisham, G., Bale, S.D., Burgess, D. and Schwartz, S.J., A large magnetic depression observed in the solar wind close to the Earth’s bow shock. Adv. Space Res., 19, (6)869-(6)872, 1997.

Chisham, G., Mann, I.R. and Orr, D., A statistical study of giant pulsation latitudinal polarization and amplitude variation. J. Geophys. Res., 102, 9619-9629, 1997.

Chisham, G. Giant pulsations (Pgs): An explanation for their rarity and occurrence during geomagnetically quiet times. J. Geophys. Res., 101, 24,755-24,763, 1996.

Chisham, G., Schwartz, S.J. and Burgess, D., The anisotropy variations of electron distributions in the terrestrial ion foreshock. J. Geophys. Res., 101, 445-455, 1996.

Chisham, G., Orr, D., Yeoman, T.K., Milling, D.K., Lester, M. and Davies, J.A., The polarization of Pc5 ULF waves around dawn: A possible ionospheric conductivity gradient effect. Ann. Geophys., 13, 159-167, 1995.

Chisham, G., Burgess, D. and Schwartz, S.J., Electron distributions in the ion foreshock. Adv. Space Res., 15, (8/9)141-(8/9)145, 1995.

Chisham, G., and Orr, D., The association between giant pulsations (Pgs) and the auroral oval. Ann. Geophys., 12, 649-654, 1994.

Chisham, G., Orr, D. and Yeoman, T.K., Observations of a giant pulsation across an extended array of ground magnetometers and on auroral radar. Planet. Space Sci., 40, 953-964, 1992.

Chisham, G., and Orr, D., Statistical studies of giant pulsations (Pgs): Harmonic mode. Planet. Space Sci., 39, 999-1006, 1991.

Chisham, G., Orr, D., Taylor, M.J. and Luhr, H., The magnetic and optical signature of a Pg pulsation. Planet. Space Sci., 38, 1443–1456, 1990.

Taylor, M.J., Chisham, G. and Orr, D., Pulsating auroral forms and their association with geomagnetic giant pulsations. Planet. Space Sci., 37, 1477-1484, 1989.

Publications from NERC Open Research Archive

2024

Walker, S.J., Laundal, K.M., Reistad, J.P., Ohma, A., Hatch, S.M., Chisham, G. , Decotte, M.. (2024) A Comparison of Auroral Oval Proxies With the Boundaries of the Auroral Electrojets. Space Weather, 22. 19 pp. 10.1029/2023SW003689

Chisham, Gareth , Kavanagh, Andrew J. , Cobbett, Neil, Breen, Paul , Barnes, Tim . (2024) High-time-resolution analysis of meridional tides in the upper mesosphere and lower thermosphere at mid-latitudes measured by the Falkland Islands SuperDARN radar. Annales Geophysicae, 42. 15 pp. 10.5194/angeo-42-1-2024

Carter, J.A., Dunlop, M., Forsyth, C., Oksavik, K., Donovon, E., Kavanagh, A. , Milan, S.E., Sergienko, T., Fear, R.C., Sibeck, D.G., Connors, M., Yeoman, T., Tan, X., Taylor, M.G.G.T., McWilliams, K., Gjerloev, J., Barnes, R., Billet, D.D., Chisham, G. , Dimmock, A., Freeman, M.P. , Han, D.-S., Hartinger, M.D., Hsieh, S.-Y.W., Hu, Z.-J., James, M.K., Juusola, L., Kauristie, K., Kronberg, E.A., Lester, M., Manuel, J., Matzka, J., McCrea, I., Miyoshi, Y., Rae, J., Ren, L., Sigernes, F., Spanswick, E., Sterne, K., Steuwer, A., Sun, T., Walach, M.-T., Walsh, B., Wang, C., Weygand, J., Wild, J., Yan, J., Zhang, J., Zhang, Q.-H.. (2024) Ground-based and additional science support for SMILE. Earth and Planetary Physics, 8. 24 pp. 10.26464/epp2023055

2023

Coxon, J.C., Chisham, G. , Freeman, M.P. , Forsyth, C., Walach, M-T., Murphy, K.R., Vines, S.K., Anderson, B.J., Smith, A.W., Fogg, A.R.. (2023) Extreme Birkeland Currents Are More Likely During Geomagnetic Storms on the Dayside of the Earth. Journal of Geophysical Research: Space Physics, 128. 16 pp. 10.1029/2023JA031946

Chisham, G. , Freeman, M.P. . (2023) Separating contributions to plasma vorticity in the high-latitude ionosphere from large-scale convection and meso-scale turbulence. Journal of Geophysical Research: Space Physics, 128. 13 pp. 10.1029/2023JA031885

Lam, M.M. , Shore, R.M. , Chisham, G. , Freeman, M.P. , Grocott, A., Walach, M.-T., Orr, L.. (2023) A Model of High Latitude Ionospheric Convection Derived From SuperDARN EOF Model Data. Space Weather, 21. 17 pp. 10.1029/2023SW003428

Orr, L., Grocott, A., Walach, M.‐T., Chisham, G. , Freeman, M.P. , Lam, M.M. , Shore, R.M. . (2023) A quantitative comparison of high latitude electric field models during a large geomagnetic storm. Space Weather, 21. 24 pp. 10.1029/2022SW003301

2022

Chisham, G. , Burrell, A.G., Thomas, E.G., Chen, Y.-J.. (2022) Ionospheric boundaries derived from auroral images. Journal of Geophysical Research: Space Physics, 127. 19 pp. 10.1029/2022JA030622

Coxon, John C., Chisham, Gareth , Freeman, Mervyn P. , Anderson, Brian J., Fear, Robert C.. (2022) Distributions of Birkeland current density observed by AMPERE are heavy‐tailed or long‐tailed. Journal of Geophysical Research: Space Physics, 127. 20 pp. 10.1029/2021JA029801

2021

Chisham, G. , Freeman, M.P. . (2021) A statistical model of vorticity in the polar ionosphere and implications for extreme values. Journal of Geophysical Research: Space Physics, 126. 16 pp. 10.1029/2021JA029307

Mooney, M.K., Marsh, M.S., Forsyth, C., Sharpe, M., Hughes, T., Bingham, S., Jackson, D.R., Rae, I.J., Chisham, G. . (2021) Evaluating auroral forecasts against satellite observations. Space Weather, 19. 16 pp. 10.1029/2020SW002688

Shore, R.M. , Freeman, M.P. , Chisham, G. . (2021) Data‐driven basis functions for SuperDARN ionospheric plasma flow characterisation and prediction. Journal of Geophysical Research: Space Physics, 126. 18 pp. 10.1029/2021JA029272

Chisham, Gareth , Burrell, Angeline, Marchaudon, Aurélie, Shepherd, Simon G., Thomas, Evan G., Ponomarenko, Pasha. (2021) Comparison of interferometer calibration techniques for improved SuperDARN elevation angles. Polar Science, 28. 15 pp. 10.1016/j.polar.2021.100638

2020

Mooney, M.K., Forsyth, C., Rae, I.J., Chisham, G. , Coxon, J.C., Marsh, M.S., Jackson, D.R., Bingham, S., Hubert, B.. (2020) Examining local time variations in the gains and losses of open magnetic flux during substorms. Journal of Geophysical Research: Space Physics, 125. 10.1029/2019JA027369

Burrell, Angeline G., Chisham, Gareth , Milan, Stephen E., Kilcommons, Liam, Chen, Yun-Ju, Thomas, Evan G., Anderson, Brian. (2020) AMPERE Polar Cap Boundaries. Annales Geophysicae, 38. 481-490. 10.5194/angeo-38-481-2020

2019

Nishitani, Nozomu, Ruohoniemi, John Michael, Lester, Mark, Baker, Joseph Benjamin Harold, Koustov, Alexandre Vasilyevich, Shepherd, Simon G., Chisham, Gareth , Hori, Tomoaki, Thomas, Evan G., Makarevich, Roman A., Marchaudon, Aurélie, Ponomarenko, Pavlo, Wild, James A., Milan, Stephen E., Bristow, William A., Devlin, John, Miller, Ethan, Greenwald, Raymond A., Ogawa, Tadahiko, Kikuchi, Takashi. (2019) Review of the accomplishments of midlatitude Super Dual Auroral Radar Network (SuperDARN) HF radars. Progress in Earth and Planetary Science, 6. 10.1186/s40645-019-0270-5

2018

Lam, Mai Mai , Freeman, Mervyn P. , Chisham, Gareth . (2018) IMF-driven change to the Antarctic tropospheric temperature due to the global atmospheric electric circuit. Journal of Atmospheric and Solar-Terrestrial Research, 180. 148-152. 10.1016/j.jastp.2017.08.027

Chisham, Gareth . (2018) Calibrating SuperDARN interferometers using meteor backscatter. Radio Science, 53. 761-774. 10.1029/2017RS006492

2017

Chisham, Gareth . (2017) A new methodology for the development of high-latitude ionospheric climatologies and empirical models. Journal of Geophysical Research: Space Physics, 122. 932-947. 10.1002/2016JA023235

2014

Longden, N., Chisham, G. , Freeman, M.P. . (2014) Magnetic local time variation and scaling of poleward auroral boundary dynamics. Journal of Geophysical Research: Space Physics, 119. 10006-10022. 10.1002/2014JA020430

Lam, Mai Mai , Chisham, Gareth , Freeman, Mervyn . (2014) Solar-wind-driven geopotential height anomalies originate in the Antarctic lower troposphere. Geophysical Research Letters, 41. 6509-6514. 10.1002/2014GL061421

2013

Lam, Mai Mai , Chisham, Gareth , Freeman, Mervyn P. . (2013) The interplanetary magnetic field influences mid-latitude surface atmospheric pressure. Environmental Research Letters, 8. 10.1088/1748-9326/8/4/045001

Milan, S. E., Grocott, A., de Larquier, S., Lester, M., Yeoman, T. K., Freeman, M. P. , Chisham, G. . (2013) Traveling ionospheric disturbances in the Weddell Sea Anomaly associated with geomagnetic activity. Journal of Geophysical Research: Space Physics, 118. 6608-6617. doi:10.1002/jgra.50566

Chisham, Gareth , Freeman, Mervyn P. . (2013) A reassessment of SuperDARN meteor echoes from the upper mesosphere and lower thermosphere. Journal of Atmospheric and Solar-Terrestrial Physics, 102. 207-221. 10.1016/j.jastp.2013.05.018

2011

Boakes, P.D., Milan, S.E., Abel, G.A., Freeman, M.P. , Chisham, G. , Hubert, B.. (2011) A superposed epoch investigation of the relation between magnetospheric solar wind driving and substorm dynamics with geosynchronous particle injection signatures. Journal of Geophysical Research, 116. 12 pp. 10.1029/2010JA016007

2010

Longden, Nicola, Chisham, Gareth , Freeman, Mervyn P. , Abel, Gary A., Sotirelis, Tom. (2010) Estimating the location of the open-closed magnetic field line boundary from auroral images. Annales Geophysicae, 28. 1659-1678. 10.5194/angeo-28-1659-2010

Chisham, G. , Freeman, M.P. . (2010) On the non-Gaussian nature of ionospheric vorticity. Geophysical Research Letters, 37. 5 pp. doi:10.1029/2010GL043714

2009

Chisham, G. , Freeman, M.P. , Abel, G.A., Bristow, W.A., Marchaudon, A., Ruohoniemi, J.M., Sofko, G.J.. (2009) Spatial distribution of average vorticity in the high-latitude ionosphere and its variation with interplanetary magnetic field direction and season. Journal of Geophysical Research, 114. 14 pp. doi:10.1029/2009JA014263

Boakes, P.D., Milan, S.E., Abel, G.A., Freeman, M.P. , Chisham, G. , Hubert, B.. (2009) A statistical study of the open magnetic flux content of the magnetosphere at the time of substorm onset. Geophysical Research Letters, 36. 5 pp. doi:10.1029/2008GL037059

Abel, G.A., Freeman, M.P. , Chisham, G. . (2009) IMF clock angle control of multifractality in ionospheric velocity fluctuations. Geophysical Research Letters, 36. 5 pp. 10.1029/2009GL040336

2008

Boakes, P.D., Milan, S.E., Abel, G.A., Freeman, M.P. , Chisham, G. , Hubert, B., Sotirelis, T.. (2008) On the use of IMAGE FUV for estimating the latitude of the open/closed magnetic field line boundary in the ionosphere. Annales Geophysicae, 26. 2759-2769. doi:10.5194/angeo-26-2759-2008

Chisham, G. , Freeman, M.P. , Abel, G.A., Lam, M. M. , Pinnock, M., Coleman, I. J., Milan, S. E., Lester, M., Bristow, W. A., Greenwald, R. A., Sofko, G. J., Villain, J.-P.. (2008) Remote sensing of the spatial and temporal structure of magnetopause and magnetotail reconnection from the ionosphere. Reviews of Geophysics, 46. 27 pp. doi:10.1029/2007RG000223

Chisham, G. , Yeoman, T. K., Sofko, G. J.. (2008) Mapping ionospheric backscatter measured by the SuperDARN HF radars – Part 1: A new empirical virtual height model. Annales Geophysicae, 26. 823-841.

Yeoman, T. K., Chisham, G. , Baddeley, L. J., Dhillon, R. S., Karhunen, T. J. T., Robinson, T. R., Senior, A., Wright, D. M.. (2008) Mapping ionospheric backscatter measured by the SuperDARN HF radars – Part 2: Assessing SuperDARN virtual height models. Annales Geophysicae, 26. 843-852. doi:10.5194/angeo-26-843-2008

2007

Abel, G.A., Freeman, M.P. , Chisham, G. , Watkins, N.W.. (2007) Investigating turbulent structure of ionospheric plasma velocity using the Halley SuperDARN radar. Nonlinear Processes in Geophysics, 14. 799-809. 10.5194/npg-14-799-2007

Abel, Gary A., Freeman, Mervyn P. , Chisham, Gareth , Watkins, Nicholas W.. (2007) Investigating the turbulent structure of ionospheric plasma velocities on open and closed magnetic field lines. In: Shaikh, Dastgeer, Zank, Gary P. (eds.). Turbulence and nonlinear processes in astrophysical plasmas, Melville, New York, American Institute of Physics, 307-312. (AIP conference proceedings, ).

Chisham, G. , Lester, M., Milan, S.E., Freeman, M.P. , Bristow, W.A., Grocott, A., McWilliams, K.A., Ruohoniemi, J.M., Yeoman, T.K., Dyson, P.L., Greenwald, R.A., Kikuchi, T., Pinnock, M., Rash, J.P.S., Sato, N., Sofko, G.J., Villain, J.-P., Walker, A.D.M.. (2007) A decade of the Super Dual Auroral Radar Network (SuperDARN): scientific achievements, new techniques and future directions. Surveys in Geophysics, 28. 33-109. doi:10.1007/s10712-007-9017-8

2006

Abel, G.A., Freeman, M.P. , Chisham, G. . (2006) Spatial structure of ionospheric convection velocities in regions of open and closed magnetic field topology. Geophysical Research Letters, 33. 4 pp. doi:10.1029/2006GL027919

2005

Abel, G.A., Freeman, M.P. , Chisham, G. . (2005) Comment on “Location of the reconnection line for northward interplanetary magnetic field” by K. J. Trattner, S. A. Fuselier, and S. M. Petrinec. Journal of Geophysical Research, 110. 2 pp. doi:10.1029/2004JA010973

Chisham, G. , Freeman, M.P. , Lam, M.M. , Abel, G.A., Sotirelis, T., Greenwald, R.A., Lester, M.. (2005) A statistical comparison of SuperDARN spectral width boundaries and DMSP particle precipitation boundaries in the afternoon sector ionosphere. Annales Geophysicae, 23. 3645-3654. 10.5194/angeo-23-3645-2005

Chisham, G. , Freeman, M.P. , Sotirelis, T., Greenwald, R.A.. (2005) The accuracy of using the spectral width boundary measured in off-meridional SuperDARN HF radar beams as a proxy for the open-closed field line boundary. Annales Geophysicae, 23. 2599-2604. 10.5194/angeo-23-2599-2005

Chisham, G. , Freeman, M.P. , Sotirelis, T., Greenwald, R.A., Lester, M., Villain, J.-P.. (2005) A statistical comparison of SuperDARN spectral width boundaries and DMSP particle precipitation boundaries in the morning sector ionosphere. Annales Geophysicae, 23. 733-743. 10.5194/angeo-23-733-2005

Chisham, Gareth . (2005) New proxy for reconnection. Astronomy and Geophysics, 46. 4.23-4.23. doi:10.1111/j.1468-4004.2005.46423.x

2004

Chisham, G. , Freeman, M.P. . (2004) A statistical comparison of SuperDARN spectral width boundaries and DMSP particle precipitation boundaries in the nightside ionosphere. Geophysical Research Letters, 31. 4 pp. 10.1029/2003GL019074

Chisham, G. , Freeman, M.P. . (2004) An investigation of latitudinal transitions in the SuperDARN Doppler spectral width parameter at different magnetic local times. Annales Geophysicae, 22. 1187-1202. 10.5194/angeo-22-1187-2004

Chisham, G. , Freeman, M.P. , Coleman, I.J., Pinnock, M., Hairston, M.R., Lester, M., Sofko, G.. (2004) Measuring the dayside reconnection rate during an interval of due northward interplanetary magnetic field. Annales Geophysicae, 22. 4243-4258. 10.5194/angeo-22-4243-2004

Freeman, M.P. , Chisham, G. . (2004) On the probability distributions of SuperDARN Doppler spectral width measurements inside and outside the cusp. Geophysical Research Letters, 31. 4 pp. 10.1029/2004GL020923

Parkinson, M.L., Chisham, G. , Pinnock, M., Dyson, P.L., Devlin, J.C.. (2004) Magnetic local time, substorm, and particle precipitation-related variations in the behaviour of SuperDARN Doppler spectral widths. Annales Geophysicae, 22. 4103-4122. 10.5194/angeo-22-4103-2004

2003

Rodger, A.S., Chisham, G. , Coleman, I.J., Freeman, M.P. , Pinnock, M.. (2003) Anti-parallel reconnection at the dayside magnetopause: ionospheric signatures and implications for the low latitude boundary layer. In: Newell, P.T., Onsager, T. (eds.). Earth's low-latitude boundary layer, Washington, D.C., American Geophysical Union, 311-318. (Geophysical Monograph, ).

Pinnock, M., Chisham, G. , Coleman, I.J., Freeman, M.P. , Hairston, M., Villain, J.-P.. (2003) The location and rate of dayside reconnection during an interval of southward interplanetary magnetic field. Annales Geophysicae, 21. 1467-1482. 10.5194/angeo-21-1467-2003

Coleman, Iain J., Chisham, Gareth , Pinnock, Michael, Freeman, Mervyn P. . (2003) Reply to comment by S.M. Petrinec and S.A. Fuselier on ‘An ionospheric convection signature of antiparallel reconnection’. Journal of Geophysical Research, 108. 3 pp. 10.1029/2002JA009568

Chisham, G. , Freeman, M.P. . (2003) A technique for accurately determining the cusp-region polar cap boundary using SuperDARN HF radar measurements. Annales Geophysicae, 21. 983-996. 10.5194/angeo-21-983-2003

2002

Chisham, G. , Coleman, I.J., Freeman, M.P. , Pinnock, M., Lester, M.. (2002) Ionospheric signatures of split reconnection X-lines during conditions of IMF Bz < 0 and |By| ∼ |Bz|: Evidence for the antiparallel merging hypothesis. Journal of Geophysical Research, 107. SMP 23-1-SMP 23-15. 10.1029/2001JA009124

Pinnock, Michael, Chisham, Gareth . (2002) Assessing the contamination of SuperDARN global convection maps by non-F-region backscatter. Annales Geophysicae, 20. 13-28. 10.5194/angeo-20-13-2002

Chisham, Gareth , Pinnock, Michael, Coleman, I.J., Hairston, M.R., Walker, A.D.M.. (2002) An unusual geometry of the ionospheric signature of the cusp: implications for magnetopause merging sites. Annales Geophysicae, 20. 29-40. 10.5194/angeo-20-29-2002

2001

Coleman, Iain J., Chisham, Gareth , Pinnock, Mike, Freeman, Mervyn P. . (2001) An ionospheric convection signature of antiparallel reconnection. Journal of Geophysical Research, 106. 28,995-29,007. 10.1029/2001JA900084

Chisham, G. , Pinnock, M., Rodger, A.S.. (2001) The response of the HF radar spectral width boundary to a switch in the IMF By direction: ionospheric consequences of transient dayside reconnection?. Journal of Geophysical Research, 106. 191-202. 10.1029/2000JA900094

2000

Chisham, G. , Pinnock, M., Rodger, A.S.. (2000) Poleward‐moving HF radar flow bursts in the cusp: Transient changes in flow speed or direction?. Geophysical Research Letters, 27. 919-922. doi:10.1029/1999GL010760

Chisham, G. , Pinnock, M., Rodger, A.S., Villain, J.-P.. (2000) High-time resolution conjugate SuperDARN radar observations of the dayside convection response to changes in IMF By. Annales Geophysicae, 18. 191-201. doi:10.1007/s00585-000-0191-y

Mann, I.R., Chisham, G. . (2000) Comment on ‘Concerning the generation of geomagnetic giant pulsations by drift-bounce resonance ring current instabilities’ by K.-H. Glassmeier et al., Ann. Geophysicae, 17, 338-350, (1999). Annales Geophysicae, 18. 161-166. 10.1007/s00585-000-0161-4

2020

Space weather monitoring receives funding boost
News 27 June, 2020

2018

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