Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa21b1552s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA21B-1552
Physics
3369 Thermospheric Dynamics (0358)
Scientific paper
During geomagnetically active times, thermospheric winds are strongly enhanced by large pressure gradients and interaction with ionized particles. In many physical and empirical models, these winds are underspecified due to the sparsity of wind measurements in the thermosphere. We use cross-track wind speeds measured by the accelerometer aboard the CHAMP satellite to characterize the response of the high-latitude thermosphere to magnetic activity. With an orbital inclination of 87.25°, the cross-track axis of CHAMP is nominally oriented in the zonal direction; however, near the poles CHAMP is able to produce ~16 measurements per day of meridional winds at both the north and south poles. This dataset represents one of the few available satellite-based thermospheric wind datasets that spans solar cycle 23 from maximum through solar minimum (2001--2008). High-latitude meridional wind dependencies on magnetic activity, local time and latitude, phase of the solar cycle, and solar wind configuration become apparent when employing a statistical analysis of the entire dataset.
Forbes Jeffrey M.
Sutton Eric K.
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