Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa51b..02r&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA51B-02
Physics
1
2427 Ionosphere/Atmosphere Interactions (0335), 3369 Thermospheric Dynamics (0358)
Scientific paper
Summertime wind measurements between 96 km and 200 km at southern high latitudes from the WINDII instrument on the Upper Atmosphere Research Satellite are statistically analyzed in geomagnetic coordinates to determine influences of ion convection associated with the interplanetary magnetic field (IMF). Because direct IMF measurements are often unavailable during the 1992--1993 period analyzed, we supplement these with proxy IMF values estimated from ground-based high-latitude magnetometer data. The winds have detectable responses to both the By and Bz components of the IMF at least down to 114~km on time scales of a few hours. On longer time scales, the geomagnetically zonal-mean zonal wind has a detectable response to IMF By down to 105~km. For a typical 20-hour averaged By value of +2.5 nT, the By-dependent component of this mean eastward wind maximizes around -80o magnetic latitude, with values of 11 m/s at 105 km and 55 m/s at 120 km. This mean eastward wind component exists mainly poleward of -65o magnetic latitude. For negative By the direction reverses to westward.
Lathuillere Ch.
Richmond Arthur D.
Vennerstroem S.
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