Neutral winds in the lower thermosphere from Dynamics Explorer 2

Details Neutral winds in the lower thermosphere from Dynamics Explorer 2 Neutral winds in the lower thermosphere from Dynamics Explorer 2

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1093k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 11, June 2, 1992, p. 1093-1096.

Physics

15

Dynamics Explorer 2 Satellite, Thermosphere, Wind Measurement, Wind Profiles, Winds Aloft, Atmospheric General Circulation Models, Fabry-Perot Interferometers, Satellite Observation

Scientific paper

Doppler line profile measurements of the OI lambda 557.7 nm 'green line' emission, made by the Fabry-Perot interferometer on Dynamics Explorer 2, have provided altitude profiles of the meridional component of the lower thermospheric neutral wind. The wind inversion technique of Nardi has been used to extract the neutral wind profiles from the line-of-sight measurements. Individual lambda 557.7 nm Doppler line profiles and inverted volume-emission-rate and neutral-wind profiles are presented. Neutral wind measurements from the about 120 km altitude level, obtained on multiple orbital passes over the summer hemisphere polar region, have been merged to produce a synthesized averaged 'vector' wind field in geomagnetic coordinates. The wind pattern exhibits a region of anticyclonic vorticity in the daytime sector of the magnetic polar cap. Averaged winds of about 300 m/sec in the equatorial direction are observed in the early morning sector. The satellite winds are in reasonable agreement with the predictions of the NCAR and UCL thermosphere general circulation models, with significant regional discrepancies evident in both magnitude and direction.

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