Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa21b0467s&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SA21B-0467
Physics
0355 Thermosphere: Composition And Chemistry, 2427 Ionosphere/Atmosphere Interactions (0335), 2704 Auroral Phenomena (2407), 2788 Storms And Substorms, 7538 Solar Irradiance
Scientific paper
During the period of April 14-24, 2002, a series of solar disturbances began several chains of events that influenced geospace. Earth's thermosphere is one endpoint for these chains. The Polar spacecraft was in a unique position to observe the end effects on the thermosphere. During April 2002, the 8 RE apogee altitude of the Polar orbit was near the equator at approximately 1000 local time. The ultraviolet sensitive Earth Camera of the Visible Imaging System on the Polar spacecraft acquired global images of Earth's dayglow through a broadband filter at FUV wavelengths. For this filter, percentage variations in dayglow intensity relative to quiet times across the dayside hemisphere are related to variations in the O/N2 ratio of the thermosphere. An initial small decrease in the O/N2 ratio was observed on April 17, 2002. The O/N2 ratio reached a maximum depletion of 45% during the magnetospheric storm on April 19, 2002 at 1907 UT. Full recovery of the O/N2 ratio followed in less than 36 hours. The O/N2 depletions were located in the polar regions and extended to mid-latitudes in both the northern and southern hemispheres. These depletion regions were highly structured and differed significantly between the hemispheres. The variability of the solar EUV photon flux can be observed in the hemisphere-integrated dayglow intensities and must be taken into account in order to obtain accurate retrieval of the O/N2 ratios.
Frank Louis A.
Sigwarth John B.
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