Middle Atmosphere Vertical Coupling Analyst
Andrew is a solar terrestrial physicist. He has worked at BAS since January 2012 on middle atmosphere dynamics, and upper atmosphere science as part of the Space Weather and Atmosphere Team. He has been fortunate to spend time in both the Arctic and Antarctic during his career
He was awarded his PhD in Solar Terrestrial Physics from Lancaster University in 2002 before taking up a postdoctoral fellowship at the High Altitude Observatory, part of the National Center for Atmospheric Research. Andrew returned to the UK in 2004 taking up teaching and subsequent research position with the SPEARS group at Lancaster.
Andrew has worked with data from both satellites and ground-based instruments to understand different mechanisms in the Sun-Earth system. Prior to joining BAS he studied the aurora, HF radio absorption, particle dynamics, geomagnetic pulsations, plasma heating and mesospheric dust. He was fortunate to take part in experiments that generated artificial aurora and to be the project scientist for a VLF receiver mounted on a Yorkshire school roof that formed part of the AARDDVARK network.
Andrew studies how the layers of the atmosphere and the near-Earth space environment couple together – known as vertical coupling.
He is interested in:
– space weather influences on the neutral middle atmosphere and the effects on regional climate variability around the poles
– how the meteorology of the lower atmosphere impacts on processes in the upper atmosphere
– heating of the upper atmosphere via space weather events
Each of these is important for our understanding of space weather events and how they impact our lives.
There is growing evidence that changes in the solar wind can lead to temperature changes in the polar regions. Waves the transfer energy and momentum into the upper atmosphere can modify conditions that affect satellite signal fade-out & scintillation, and the behaviour of electric current systems. Space weather events lead to heating of the upper atmosphere which in turn affects the lifetime of satellites and space debris in Low Earth Orbit (LEO). This is important to understand since LEO is becoming very crowded and collisions with debris can seriously damage satellites.
Part of the EISCAT Science Support Group working with colleagues at RAL Space
Middle & Upper Atmosphere
T. Moffat-Griffin, M. J. Jarvis, S. R. Colwell, A. J. Kavanagh, G. L. Manney, and W. H. Daffer: Seasonal variations in lower stratospheric gravity wave energy above the Falkland Islands, J. Geophys. Res. Atmos., 118, 10,861–10,869, doi:10.1002/jgrd.50859., 2013.
Routledge, G. M. J. Kosch, A. Senior, A. J. Kavanagh, I. W. McCrea, and M. T. Rietveld: A statistical survey of electron temperature enhancements in heater modulated polar mesospheric summer echoes at EISCAT, Journal of Atmospheric and Solar Terrestrial Physics 73(4), 472-482. doi:10.1016/j.jastp.2010.11.004. 2011.
A. Kero, C. F. Enell, A. J. Kavanagh, J. Vierinen, I. Virtanen, E. Turunen: Could negative ion production explain the polar mesosphere winter echo (PMWE) modulation in active HF heating experiments? Geophys. Res. Lett. 35(23), doi: 10.1029/2008GL035798 2008
A. J. Kavanagh, F. Honary, M. T. Rietveld, and A. Senior. First Observations of the Artificial Modulation of Polar Mesospheric Winter Echoes. Geophys. Res. Lett., 33(19) L19801. doi:10.1029/2006GL027565, 2006.
E. Griffin, M. Kosch, A. Aruliah, A. J. Kavanagh, I. McWhirter, A. Senior, E. Ford, C. Davis, T. Abe, J. Kurihara, K. Kauristie, and Y. Ogawa. Combined Ground-based Optical Support for the Aurora (DELTA) Sounding Rocket Campaign. Earth, Planets and Space. 58(9), 1113-1121, 2006.
C. J. Rodger, A. J. Kavanagh, M. A. Clilverd, and S. R. Marple: Comparison between POES energetic electron precipitation observations and riometer absorptions: Implications for determining true precipitation fluxes, J. Geophys. Res. Space Physics, 118, 7810–7821, doi:10.1002/2013JA019439. 2013.
A. J. Kavanagh, F. Honary, E. F. Donovan, T. Ulich, and M. H. Denton (2012): Key features of >30 keV electron precipitation during high speed solar wind streams: A superposed epoch analysis, J. Geophys. Res., 117, A00L09, doi:10.1029/2011JA017320.
Rodger, C. J., M. A. Clilverd, A. J. Kavanagh, C. E. J. Watt, P. T. Verronen, and T. Raita: Contrasting the responses of three different ground-based instruments to energetic electron precipitation, Radio Sci., 47, RS2021, doi:10.1029/2011RS004971. 2012.
J. J. Denton, M.H. Denton, A. J. Kavanagh, H. Harron, T. Ulich, J. S. Denton: Training school pupils in the sceintific method: Student participation in an international VLF radio experiment, Phys. Educ., 47, 64, doi: 10.1088/0031-9120/47/1/64, 2012
A. J. Kavanagh, M. Denton, J. Denton, H. Harron: Probing Geospace with VLF radio signals, Astronomy and Geophysics, 52(2), 27-30, 2011
P. Wild, F. Honary, A. J. Kavanagh and A. Senior: Triangulating the height of Cosmic Noise Absorption: A method for estimating the Characteristic Energy of Precipitating Electrons, J. Geophys. Res. Space Physics, 115(A12326) doi:10.1029/2010JA015766. 2010
M. A. Clilverd, C. J. Rodger, S. Dietrich T. Raita, T. Ulich, E. Clarke, A. W. P. Thomson and A. J. Kavanagh: High-latitude geomagnetically induced current events observed on very low frequency radio wave receiver systems. Rad. Sci. 45. doi: 10.1029/2009RS004215. 2010
N. Longden, F. Honary, A. J. Kavanagh, and J. Manninen: The Driving Mechanisms of Particle Precipitation during the Moderate Geomagnetic Storm of 7 January 2005, Ann. Geophys.. 25(9) SRef-ID:1432-0576/angeo/2007-25-2053. 2007.
M. A. Clilverd, C. J. Rodger, R. M. Millan, J. G. Sample, M. Kokorowski, M. P. McCarthy, T. Ulich, T. Raita, A. J. Kavanagh, and E. Spanswick: Energetic particle precipitation into the middle atmosphere triggered by a coronal mass ejection, J. Geophys. Res. Space Physics. 112 A12206. doi:10.1029/2007JA012395. 2007.
A. J. Kavanagh, G. Lu, E. F. Donovan, G. D. Reeves, F. Honary, J. Manninen, and T. J. Immel: Energetic Electron Precipitation during Sawtooth Injections, Ann. Geophys. 25(5), 1199-1214. SRef-ID:1432-0576/angeo/2007-25-1199. 2007.
A. Kavanagh and M. Denton: High-speed solar-wind streams and geospace interactions. Astronomy and Geophysics. 48(6) 6.24-6.26, 2007.
A. J. Kavanagh, S. R. Marple, F. Honary, I. W. McCrea, and A. Senior: On Solar Protons and Polar Cap Absorption: Constraints on an Empirical Relationship, Ann. Geophys. 22(4) pp. 1133-1147. SRef-ID:1432-0576/ag/2004-22-1133. 2004.
A. J. Kavanagh, M. J. Kosch, F. Honary, A. Senior, S. R. Marple, E. E. Woodfield, and I. W. McCrea: The Statistical Dependence of Auroral Absorption on Geomagnetic and Solar Wind Parameters, Ann. Geophys. 22(3), 877-887. SRef-ID:1432-0576/ag/2004-22-877. 2004.
E. E. Woodfield, J. A. Wild, A. J. Kavanagh, A. Senior, and S. E. Milan: Combining incoherent scatter radar data and IRI2007 to monitor the open-closed field line boundary during substorms, J. Geophys. Res. Space Physics A00115. doi:10.1029/2010JA015751. 2010.
M. Beharrell, A. J.Kavanagh and F. Honary: On the origin of high m magnetospheric waves, J. Geophys. Res. Space Physics, 115, doi:10.1029/2009JA014709. 2010
M. A. Clilverd, C. J. Rodger, J. B. Brundell, J. L. Bahr, N. Cobbett, T. Moffat-Griffin, A. J. Kavanagh, A. Seppälä, N. R. Thomson, R. H. W. Friedel, and F. W. Menk: Energetic electron precipitation during sub-storm injection events: high latitude fluxes and an unexpected mid-latitude signature, J. Geophys. Res. Space Physics. doi:10.1029/2008JA013220. 2008
A. Aminaei, F. Honary, A. J. Kavanagh, E. Spanswick, and A. Viljanen: Characteristics of Night-time Absorption Spike Events. Ann. Geophys. 24(7), 1887-1904. SRef-ID:1432-0576/ag/2006-24-1887. 2006.
A. J. Kavanagh, F. Honary, I. W. McCrea, E. Donovan, E. E. Woodfield, J. Manninen, and P. C. Anderson: Substorm Related Changes in Precipitation in the Dayside Auroral Zone – A Multi Instrument Case Study, Ann. Geophys. 20(9), 1321-1334. SRef-ID:1432-0576/ag/2002-20-1321. 2002.
Ionosphere and Aurora
A. J. Kavanagh, J. A. Wild, and F. Honary: Observations of Omega Bands Using an Imaging Riometer, Ann. Geophys.. 27(11), 4183-4195. SRef-ID: 1432-0576/angeo/2009-27-4183, 2009.
L. Alfonsi, A. J. Kavanagh, E. Amata, P. Cilliers, E. Correia, M. Freeman, K. Kauristie, R. Liu, J.-P. Luntama, C. N. Mitchell, G.A. Zherebtsov: Probing the high latitude ionosphere from ground-based observations: The state of current knowledge and capabilities during IPY (2007-2009), J. Atmos. Sol. Terr. Phys., 70(18). 2293-2308, 2008
B. Gustavsson, M. J. Kosch, A. Senior, A. J. Kavanagh, B. U. E. Brändström, and E. M. Blixt: Combined EISCAT Radar and Optical Multispectral and Tomographic Observations of Black Aurora, J. Geophys. Res. Space Physics. ISSN 0148-0227. 113 A06308. doi:10.1029/2007JA012999. 2008.
A. Senior, A. J. Kavanagh, M. J. Kosch, and F. Honary: Statistical Relationships Between Cosmic Radio Noise Absorption and Ionospheric Electrical Conductances in the Auroral Zone, J. Geophys. Res. Space Physics. ISSN 0148-0227. 112 A11301. doi:10.1029/2007JA012519. 2007.
K. Cierpka, M. J. Kosch, H. Holma, A. J. Kavanagh, and T. Hagfors: Novel Fabry-Perot Interferometer Measurements of F-region Ion Temperature, Geophys. Res. Lett. 30(6), 26-1-26-4. doi:10.1029/2002GL015833. 2003.
M. J. Kosch, M. T. Rietveld, A. Senior, I. W. McCrea, A. J. Kavanagh, B. Isham, and F. Honary: Novel Artificial Optical Annular Structures in the High Latitude Ionosphere over EISCAT, Geophys. Res. Lett. 31(12) L12805 1-4. doi:10.1029/2004GL019713. 2004.
M. J. Kosch, M. T. Rietveld, A. J. Kavanagh, C. Davis, T. K. Yeoman, F. Honary, and T. Hagfors: High-latitude Pump-induced Optical Emissions for Frequencies Close to the Third Electron Gyro-harmonic, Geophys. Res. Lett. 29(23), 2112-2115. doi:10.1029/2002GL015744. 2002.
Rodger, Craig J., Kavanagh, Andrew J., Clilverd, Mark A., Marple, Steve R.. (2013) Comparison between POES energetic electron precipitation observations and riometer absorptions; implications for determining true precipitation fluxes. Journal of Geophysical Research: Space Physics, 118. 7810-7821. 10.1002/2013JA019439
Moffat-Griffin, T., Jarvis, M.J., Colwell, S.R., Kavanagh, A.J., Manney, G.L., Daffer, W.H.. (2013) Seasonal variations in lower stratospheric gravity wave energy above the Falkland Islands. Journal of Geophysical Research: Atmospheres, 118. 10861-10869. 10.1002/jgrd.50859