Magnetosphere-ionosphere convection and the upper thermosphere wind: Comparison of CHAMP observations with UAM modelling

Details Magnetosphere-ionosphere convection and the upper thermosphere wind: Comparison of CHAMP observations with UAM modelling Magnetosphere-ionosphere convection and the upper thermosphere wind: Comparison of CHAMP observations with UAM modelling

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa41a1714f&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA41A-1714

Physics

[2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2753] Magnetospheric Physics / Numerical Modeling, [2760] Magnetospheric Physics / Plasma Convection, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions

Scientific paper

At high latitudes, important features of the thermospheric behaviour are better ordered with respect to geomagnetic coordinates than geographically. This points to the fact that main drivers of the high latitude upper thermosphere are bound to geomagnetic coordinates and are influenced by varying solar wind conditions via electromagnetic coupling with the magnetosphere. By use of accelerometer measurements of the mass density and cross-track thermospheric wind onboard the polar orbiting LEO satellite CHAMP, we investigate the high-latitude upper thermosphere behaviour for selected periods with sharp changes of IMF and solar wind conditions and compared the measurements with simulation results of a global, time-dependent theoretical model. In this study we employ the Upper Atmosphere Model (UAM), a fully self-consistent model of the neutral and plasma composition and temperature, which includes the solution of the momentum and continuity equations to calculate the 3D thermospheric circulation. We obtain characteristic thermospheric circulation pattern and response times to the varying magnetosphere-ionosphere convection pattern.

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