Effect of the Interplanetary Magnetic Field on the Thermospheric Density at High Latitude

Details Effect of the Interplanetary Magnetic Field on the Thermospheric Density at High Latitude Effect of the Interplanetary Magnetic Field on the Thermospheric Density at High Latitude

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa23b..07k&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA23B-07

Physics

0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition (3369), 1704 Atmospheric Sciences, 2134 Interplanetary Magnetic Fields, 5462 Polar Regions

Scientific paper

The high-latitude thermospheric total mass density near 400 km altitude, derived from the high-accuracy accelerometer on board the Challenging Minisatellite Payload (CHAMP) spacecraft in November 2001 through February 2002, is statistically analyzed as a function of the direction and strength of the interplanetary magnetic field (IMF) for southern hemisphere. The difference densities, which are obtained by subtracting values for zero IMF from these for nonzero IMF, show the IMF dependence as follow: 1) Difference density for negative By shows increase in the early morning and dawn sectors, but decrease in the premidnight and dusk sectors. 2) For positive By it is opposite in the signs for negative By. 3) Those for negative Bz show significant increase in the cusp region and premidnight sector, but decrease in the dawn sector. High-latitude thermospheric total mass densities and variations with IMF simulated by the National Center for Atmospheric Research Thermosphere- Ionosphere Electrodynamics General Circulation Model (NCAR/TIEGCM), coupled with a new quantitative empirical model of the high-latitude forcing on the thermosphere, show reasonable agreement with CHAMP observations for the dependence of density on the IMF direction. Using the numerical simulation, we can gain insight into sources responsible for the thermospheric density variations. It is suggested that high-latitude thermospheric density variations with different IMF conditions can be strongly determined by thermospheric winds, which vary strongly with respect to the direction of IMF. In addition, we find that the density variations are also influenced by the local heating associated with ionospheric current or auroral particle precipitation, or by the local cooling, which varies with IMF conditions.

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