Physics
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9..785f&link_type=abstract
Geophysical Research Letters, vol. 9, July 1982, p. 785-788. NASA-supported research
Physics
19
Airglow, Fabry-Perot Interferometers, Meridional Flow, Reversed Flow, Thermosphere, Wind Direction, Wind Velocity Measurement, Emission Spectra, Line Spectra, Neutral Gases, Periodic Variations
Scientific paper
Direct measurements of the meridional neutral winds in the thermosphere made with the Fabry-Perot interferometer at the Arecibo Observatory show the postmidnight meridional wind reversal that was inferred from previous incoherent scatter radar ion-drift data and airglow intensity maps and observed in-situ with the Atmosphere Explorer-E satellite. Data for three nights between October 29 and December 9, 1981, are presented. For this period, the meridional wind is observed to be northward after sunset and to turn south before midnight; the velocities often exceed 100 m/sec. After midnight, its direction is seen to reverse to northward for one to two hours. The reversal after midnight is recurrent and propagates from the equator, as predicted on the basis of previous meridional airglow intensity measurements.
Friedman Jeffrey F.
Herrero Federico A.
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