HR: 16:30h
AN: SA14A-03    [Abstracts]
TI: Global Observations of Exospheric Temperature During the Bastille Day Event and Comparisons With the TIMEGCM Model and NRLMSIS-2000
AU: * Dymond, K F
EM: kenneth.dymond@nrl.navy.mil
AF: E. O. Hulburt Center for Space Research, Code 7607 Naval Research Laboratory, Washington, DC 20375-5352 United States
AU: Budzien, S A
AF: E. O. Hulburt Center for Space Research, Code 7607 Naval Research Laboratory, Washington, DC 20375-5352 United States
AU: Thonnard, S E
AF: E. O. Hulburt Center for Space Research, Code 7607 Naval Research Laboratory, Washington, DC 20375-5352 United States
AU: Nicholas, A C
AF: E. O. Hulburt Center for Space Research, Code 7607 Naval Research Laboratory, Washington, DC 20375-5352 United States
AU: McCoy, R P
EM: mccyr@onr.navy.mil
AF: Office of Naval Research, Code 321SR 800 N. Quincy Street, Arlington, VA 22217-5660 United States
AU: Crowley, G
EM: gcrowley@swri.edu
AF: Southwest Research Institute, 6220 Culebra Rd, San Antonio, TX 78238-5166 United States
AB: We present observations of the global exospheric temperature and its variation during the Bastille Day geomagnetic storm that occurred on July 14-18, 2000. The Bastiile Day event was initiated by an X-class solar flare that was followed by a coronal mass ejection. The CME eventually produced a major geomagnetic storm. Global exospheric temperatures were derived by fitting the topside intensity distribution of limb scan data observed by the Low Resolution Airglow and Aurora Spectrograph (LORAAS) on the {\it Advanced Research and Global Observation Satellite (ARGOS)}. The {\it ARGOS} was launched into a sun-synchronous orbit on 23 February 1999 at 2:29:55 AM Pacific Standard Time. The LORAAS obtained limb scans every 90 seconds providing soundings spaced by approximately 5.4$\deg$ of latitude. We compare the LORAAS-derived exospheric temperatures with exospheric temperatures predicted by the Mass Spectrometer and Incoherent Scatter (MSIS) with Thermosphere Ionosphere Mesosphere Electrodynamics General Circulation Model (TIMEGCM). We find that the measured temperatures are systematically higher, by $\sim$200 K, than predicted by the NRLMSIS-2000 model and the temporal evolution of the temperature changes is also not well reproduced by the model. The TIMEGCM model, with its more accurate picture of the geomagnetic and solar effects, is shown to better capture both the time evolution of the storm-time temperature changes and to also more accurately predict the quiet time temperatures.
DE: 0310 Airglow and aurora
DE: 0350 Pressure, density, and temperature
DE: 0355 Thermosphere--composition and chemistry
DE: 0394 Instruments and techniques
SC: SPA-Aeronomy [SA]
MN: 2004 AGU Fall Meeting