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Detailed Reference Information |
Wu, Q., Killeen, T.L. and Spencer, N.W. (1994). Dynamics Explorer 2 observations of equatorial thermospheric winds and temperatures: Local time and longitudinal dependences. Journal of Geophysical Research 99: doi: 10.1029/93JA02521. issn: 0148-0227. |
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We have analyzed a large database of Dynamics Explorer 2 (DE 2) measurements of equatorial (3, respectively). Local time variations and longitudinal dependences on the duskside, dayside, and nightside have been separately examined. The dayside hourly averaged neutral zonal winds are relatively insensitive to variations in geomagnetic activity and appear to show an inverse dependence (lower zonal wind speed for higher Kp) in the midnight-dawn local time sector. The duskside neutral temperatures show a region of enhancement (by ~60 K) over the South Atlantic magnetic anomaly. The quiet time zonal winds are weaker than the corresponding active time zonal winds on the dayside near the South Atlantic magnetic anomaly. Enhanced ionization in the region, which increases the ion drag on the neutral gas, is suggested as the causal mechanism for these effects. The DE 2 averaged measurements have also been compared with MSIS-86/HWM90 and VSH models. The data and models are in good general agreement, though, the MSIS-86/HWM90 model predicts stronger dayside zonal winds than are observed under active conditions and the VSH model appears to underestimate the magnitude of the dayside zonal winds for both high and low Kp cases. ¿ American Geophysical Union 1994 |
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Abstract |
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Keywords
Meteorology and Atmospheric Dynamics, Thermospheric dynamics, Ionosphere, Ionosphere-atmosphere interactions, Ionosphere, Equatorial ionosphere |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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