Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm31a1510l&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM31A-1510
Physics
[2407] Ionosphere / Auroral Ionosphere, [2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2455] Ionosphere / Particle Precipitation, [2704] Magnetospheric Physics / Auroral Phenomena
Scientific paper
The hemispheric power, which is the total auroral electron precipitation energy flux over the auroral oval area in one hemisphere, is calculated from the averaged energy flux derived from Far-ultraviolet emissions of the Global Ultraviolet Imager (GUVI) instrument on board the TIMED satellite. Using observations from 2002 to 2007, the seasonal variation in the hemispheric power are separated from its hemispheric dependence. The results show that there is almost no June/Southern-winter to December/Northern-winter difference under all conditions (Kp=1-5). On the other hand, under geomagnetically quiet conditions (Kp<=3), the hemispheric power shows significant summer-winter and June/Northern-summer to December/Southern-summer differences, which vary between 5%-35% and decrease with an increase in the Kp index. These seasonal variations in hemispheric power disappear under geomagnetically disturbed conditions (Kp=4, 5).
Burns Alan G.
Luan XiaoLi
Paxton Larry J.
Solomon Stanley C.
Wang Wenhong
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