The Causes of Time Variations of Winds and Temperatures in a Geomagnetic Storm

Details The Causes of Time Variations of Winds and Temperatures in a Geomagnetic Storm The Causes of Time Variations of Winds and Temperatures in a Geomagnetic Storm

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa12b0681k&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA12B-0681

Physics

0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition

Scientific paper

Space Weather Month occurred in September and October 1999. It is being intensively studied by both experimentalists and theorists as a special S-RAMP campaign (see http://worktools.si.umich.edu). During this period some small geomagnetic storms occurred. A series of these storms (September, 12-17, 1999) has been simulated using the Thermosphere-Ionosphere Nested Grid (TING) model coupled with the Lyon-Fedder-Mobarry (LFM) MHD model. This simulation is used in this presentation to study how the neutral temperature and wind changes evolved during the storms. In addition, postprocessors have been applied to the model outputs to aid in understanding how the processes forcing the winds and temperatures also change with time. Of particular interest is the means by which the low latitude temperature increases that occur at midnight are forced. The thermal postprocessor indicates that temperature increases in this region are mainly driven by convergence of the horizontal winds and downwelling leading to compressional heating. The momentum processor is applied to aid in understanding how and why this convergence evolves.

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