Unusual spikes in high latitude ion temperature

Details Unusual spikes in high latitude ion temperature Unusual spikes in high latitude ion temperature

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa31b1416r&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA31B-1416

Physics

[0335] Atmospheric Composition And Structure / Ion Chemistry Of The Atmosphere, [0358] Atmospheric Composition And Structure / Thermosphere: Energy Deposition, [2407] Ionosphere / Auroral Ionosphere, [2427] Ionosphere / Ionosphere/Atmosphere Interactions

Scientific paper

This paper presents observations of spikes in ion temperature that have been observed by the Poker Flat Advanced Modular Incoherent Scatter Radar (PFISR) in the summer of 2007. The spikes occur in the pre-midnight hours during periods of low magnetic activity. They have a sharply peaked triangular shape characterized by increases of 100-300 degrees above the ambient temperature of ~ 800 degrees. The elevated ion temperatures have a duration of ~1-3 hours and occur at the same time as steep decreases in electron density. The electron temperature usually shows no unusual behavior at these times. We investigate the possible cause of the ion temperature spikes with the aid of the field line interhemispheric plasma (FLIP) model.

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