Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa31b..09l&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA31B-09
Physics
0310 Airglow And Aurora, 0358 Thermosphere: Energy Deposition (3369), 2716 Energetic Particles: Precipitating
Scientific paper
This work investigates changes of high-latitude auroral precipitation energy with geophysical conditions using measurements by the Global Ultraviolet Imager (GUVI) on the TIMED satellite from 2002 to 2007. GUVI images can obtain emissions from a significant potion of the auroral oval, and thus have much better coverage than in-situ particle measurements along satellite tracks. Six years of GUVI observations make it possible to study solar cycle, seasonal, hemispheric and geomagnetic variations of auroral electron precipitation. In this study, we use energy flux and mean energy retrieved from GUVI images to obtain hemispheric power and composite auroral maps. The change of hemispheric power and auroral maps with solar wind, solar activity, season and geomagnetic activity are then investigated. We also compare hemispheric power and auroral maps from the two hemispheres under same geophysical conditions to investigate whether there are significant hemispheric asymmetries in auroral precipitation.
Burns A. A.
Luan XiaoLi
Solomon Sean
Wang Wenhong
Zhang Yajing
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