Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...10630323s&link_type=abstract
Journal of Geophysical Research, Volume 106, Issue A12, p. 30323-30330
Physics
4
Atmospheric Composition And Structure: Airglow And Aurora, Magnetospheric Physics: Energetic Particles, Precipitating, Magnetospheric Physics: Ring Current
Scientific paper
We report the detection of storm time enhancements in the low-latitude far ultraviolet airglow as observed by the Low-Resolution Airglow and Aurora Spectrograph on the Advanced Research and Global Observation Satellite. The enhancements are present in several of the dayside and nightside emission lines, including the prominent 1304- and 1356-Å lines of atomic oxygen as well as the N2 Lyman-Birge-Hopfield bands near 1465 and 1495 Å. Time histories of the average low-latitude intensities of all emissions show a correlation with geomagnetic activity, as measured by the Dst index. Comparisons between the prestorm and storm time latitude profiles indicate that the emission increases are confined to magnetic latitudes <20°. We have used the ratio of 1356 Å/1495 Å as a measure of O/N2 composition changes at these low latitudes. Although this ratio shows composition changes during the storm, no change in the ratio is observed during the peak in the emission. On the basis of the emission morphology, we conclude that these emission enhancements are most likely the result of energetic neutral atoms, which are created in the ring current and collisionally excite ambient atomic oxygen and molecular nitrogen in the low-altitude, low-latitude ionosphere and thermosphere.
Budzien Scott A.
Chakrabarti Supriya
Dymond Kenneth F.
McCoy Robert P.
Stephan Andrew Ward
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