Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm31b2097c&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM31B-2097
Physics
[0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry
Scientific paper
Data from the tri-axial accelerometer on the CHAMP satellite have revealed the thermospheric density and its variability in unprecedented detail. The data often contain regions of high density located in the noon sector at high latitudes. In this paper we provide the first detailed explanation of a high latitude density enhancement observed by CHAMP, focusing on the August 24, 2005 interval. The TIMEGCM model was driven by high-fidelity high-latitude inputs specified by the Assimilative Mapping of Ionospheric Electrodynamics (AMIE) algorithm, and reproduces the density enhancements observed by CHAMP. The TIMEGCM and AMIE provide a global framework for interpretation of the CHAMP densities. Our simulations reveal that the observed significant density enhancement at high latitudes resulted from unexpectedly large amounts of energy that entered the Ionosphere-Thermosphere system at cusp latitudes during an interval of strong (40 nT) positive BY. Understanding thermospheric density is important because it exerts a drag on Low-Earth Orbiting (LEO) satellites, including the space shuttle and space station. Changes in the density and composition of the neutral atmosphere create variable satellite drag, adversely affecting spacecraft missions like maneuver planning and re-entry.
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