Observations of Three Dimensional Neutral Composition Changes in the Thermosphere During Geomagnetic Storms.

Details Observations of Three Dimensional Neutral Composition Changes in the Thermosphere During Geomagnetic Storms. Observations of Three Dimensional Neutral Composition Changes in the Thermosphere During Geomagnetic Storms.

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa23a..06s&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA23A-06

Physics

0355 Thermosphere: Composition And Chemistry, 2427 Ionosphere/Atmosphere Interactions (0335), 2443 Midlatitude Ionosphere, 2736 Magnetosphere/Ionosphere Interactions (2431), 2788 Magnetic Storms And Substorms (7954)

Scientific paper

The geomagnetic storm of May 29-30, 2003 caused large decreases in the O/N2 column density ratio in the thermosphere. For this storm, O/N2 column density decreases of > 50% were observed to extend to mid-to-low latitudes with the FUV sensitive Polar/VIS Earth Camera. Simultaneously in the same region, the FUV sensitive TIMED/GUVI camera observed height profiles of the O/N2 ratio along its orbital track. The combination of the two data sets thus provides a 3-dimensional picture of the evolution of the thermosphere for this storm. The reduction in the O/N2 column density ratio is due mainly to increases in the molecular species that have welled-up into the thermosphere from the lower levels of the atmosphere due to auroral heating. The geomagnetic-storm driven increase in molecular densities at typical ionospheric heights rapidly charge exchange with the ambient ionized atoms and subsequently dissociatively recombine with the ionospheric electrons leading to a reduction in the total charge density. Details of the combined observations will be discussed.

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