Neutral composition effects on negative ionospheric storms at middle and low latitudes: Polar ultraviolet imager observations

Details Neutral composition effects on negative ionospheric storms at middle and low latitudes: Polar ultraviolet imager observations Neutral composition effects on negative ionospheric storms at middle and low latitudes: Polar ultraviolet imager observations

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa33a1138w&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA33A-1138

Physics

2435 Ionospheric Disturbances, 2443 Midlatitude Ionosphere, 0355 Thermosphere: Composition And Chemistry

Scientific paper

The April 17-24 geomagnetic storm event is studied to understand the relationship between neutral composition (specifically, atomic oxygen to molecular nitrogen column density ratios, O/N2) and total electron content (TEC) on an instantaneous global scale on dayside. The O/N2 column density ratio is derived from the dayglow emissions of OI 135.6 nm and N2 Lyman-Birge-Hopfield (160-180 nm) acquired from the ultraviolet imager (UVI) aboard the Polar satellite and the total electron content is derived from the phase delays of dual-band global positioning satellite (GPS) accumulated around the globe. It is found that the regions of decreasing O/N2 generally coincided with the regions of depleted TEC during and the after the development of the storm. This is consistent with previous theoretical and experimental analysis in which composition changes play a major role in the negative ionospheric storm effects. At lower latitudes there was no noticeable change in O/N2. The TEC data also showed no noticeable change, except a few "short-lived," localized positive TEC effects. Long duration positive storm effects, frequently predicted by general circulation models, are not observed. Detailed results will be presented and their implication will be discussed.

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