12817 to 12828 of 13722 results
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Model of the energization of outer-zone electrons by whistler-mode chorus during the October 9, 1990 geomagnetic storm
Read more of: Model of the energization of outer-zone electrons by whistler-mode chorus during the October 9, 1990 geomagnetic storm[1] Relativistic (> 1 MeV) ‘killer electrons’ are frequently generated in the Earth’s inner magnetosphere during the recovery phase of a typical magnetic storm. We test the hypothesis that the […]
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Additional stratospheric NOx production by relativistic electron precipitation during the 2004 spring NOx descent event
Read more of: Additional stratospheric NOx production by relativistic electron precipitation during the 2004 spring NOx descent eventWe analyze in detail the February 2004 Global Ozone Monitoring by Occultation of Stars (GOMOS) NO2 observations in the northern polar latitudes during the springtime descent of NOx from the […]
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Atmospheric impact of the Carrington event solar protons
Read more of: Atmospheric impact of the Carrington event solar protonsThe Carrington event of August/September 1859 was the most significant solar proton event (SPE) of the last 450 years, about four times larger than the solar proton fluence of the […]
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Energetic electron precipitation during substorm injection events: high-latitude fluxes and an unexpected midlatitude signature
Read more of: Energetic electron precipitation during substorm injection events: high-latitude fluxes and an unexpected midlatitude signatureGeosynchronous Los Alamos National Laboratory (LANL-97A) satellite particle data, riometer data, and radio wave data recorded at high geomagnetic latitudes in the region south of Australia and New Zealand are […]
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Observations of relativistic electron precipitation from the radiation belts driven by EMIC waves
Read more of: Observations of relativistic electron precipitation from the radiation belts driven by EMIC wavesFor some time theoretical modeling has shown that electromagnetic ion cyclotron (EMIC) waves should play an important role in the loss of relativistic electrons from the radiation belts, through precipitation […]
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Radiation belt electron precipitation by man-made VLF transmissions
Read more of: Radiation belt electron precipitation by man-made VLF transmissionsEnhancements of drift-loss cone fluxes in the inner radiation belt have been observed to coincide with the geographic location of the powerful VLF transmitter NWC. In this paper we expand […]
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Significance of transient luminous events to neutral chemistry: experimental measurements
Read more of: Significance of transient luminous events to neutral chemistry: experimental measurementsFor many years it has been suggested that transient luminous events (TLE) occurring over thunderstorms may produce significant modifications to neutral atmospheric chemistry. Some have speculated that large ionisation increases […]
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The effects of hard-spectra solar proton events on the middle atmosphere
Read more of: The effects of hard-spectra solar proton events on the middle atmosphereThe stratospheric and mesospheric impacts of the solar proton events of January 2005 are studied here using ion and neutral chemistry modeling and subionospheric radio wave propagation observations and modeling. […]
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Arctic and Antarctic polar winter NOx and energetic particle precipitation in 2002-2006
Read more of: Arctic and Antarctic polar winter NOx and energetic particle precipitation in 2002-2006We report GOMOS nighttime observations of middle atmosphere NO2 and O-3 profiles during eight recent polar winters in the Arctic and Antarctic. The NO2 measurements are used to study the […]
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Energetic particle precipitation into the middle atmosphere triggered by a coronal mass ejection
Read more of: Energetic particle precipitation into the middle atmosphere triggered by a coronal mass ejectionPrecipitation of relativistic electrons into the atmosphere has been suggested as the primary loss mechanism for radiation belt electrons during large geomagnetic storms. Here we investigate the geographical spread of […]
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Latitudinal extent of the January 2005 solar proton event in the Northern Hemisphere from satellite observations of hydroxyl
Read more of: Latitudinal extent of the January 2005 solar proton event in the Northern Hemisphere from satellite observations of hydroxylWe utilise hydroxyl observations from the MLS/Aura satellite instrument to study the latitudinal extent of particle forcing in the northern polar region during the January 2005 solar proton event. MLS […]