Comparison of Nighttime Zonal Neutral Winds and Plasma Bubble Drift Velocities over Brazil

Details Comparison of Nighttime Zonal Neutral Winds and Plasma Bubble Drift Velocities over Brazil Comparison of Nighttime Zonal Neutral Winds and Plasma Bubble Drift Velocities over Brazil

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa22a..04c&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA22A-04

Physics

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [0343] Atmospheric Composition And Structure / Planetary Atmospheres, [2415] Ionosphere / Equatorial Ionosphere, [2439] Ionosphere / Ionospheric Irregularities

Scientific paper

We present the first simultaneous measurements of equatorial thermospheric neutral wind measurements and plasma bubble (EPB) zonal speeds over northeastern Brazil during September-December 2009 and 2010. The wind data are obtained from a bi-static Fabry-Perot interferometer experiment measuring the Doppler shift of the 630.0-nm spectral emission. The FPIs are located at Cajazeiras (6.86°S, 38.56°W) and Cariri (7.38°S, 36.53°W). The EPB zonal speed, which is assumed to be equal to the drift of the background plasma, is measured using images of the 630.0-nm emission obtained from a wide-angle imaging system collocated with the FPI at Cajazeiras. In general, the simultaneous measurement of the zonal neutral wind and the EPB zonal speed show excellent agreement. However, the EPB zonal speed is slower than that of the wind motion in the early evening hours on several occasions, suggesting the F-region dynamo is not fully activated.

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