Thermospheric neutral winds at low latitudes during the September-October 1986 Sundial campaign - Optical interferometer results

Details Thermospheric neutral winds at low latitudes during the September-October 1986 Sundial campaign - Optical interferometer results Thermospheric neutral winds at low latitudes during the September-October 1986 Sundial campaign - Optical interferometer results

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8..409b&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 8, June 1990, p. 409-417.

Physics

6

Airglow, Fabry-Perot Interferometers, Thermosphere, Tropical Regions, Wind Profiles, Atmospheric Circulation, Atmospheric Models, Diurnal Variations, South America, Temperature Distribution

Scientific paper

Results of Fabry-Perot interferometer determinations of near-equatorial thermospheric temperatures and winds are presented for the late September and early October 1986 period. Measurements were made from Arequipa, Peru and Sao Jose dos Campos, Brazil. The thermospheric temperatures during the night at Sao Jose averaged 915 K, with a measurement uncertainty of + or - 75 K. At both Arequipa and Sao Jose, the meridional component of the thermospheric winds was generally poleward (southward) in the early night, became equatorward (northward) after about 21-22 h LT, reached a maximum velocity of about 40-100 m/s near local midnight, then decreased to zero and became poleward after about 02-03 h LT. The zonal wind component was eastward after about 19 h LT, reached a maximum of 100-150 m/s at about 22 h LT and decreased thereafter. Substantial day-to-day variability and convergence effects were seen in the Arequipa wind determinations. The poleward-equatorward-poleward change in the meridional wind component at the two stations agrees with the midnight pressure bulge model of Mayr et al. (1979), but the Sao Jose winds are about half the model values. The Arequipa meridional winds are consistent with the AE-E satellite results and mirror the behavior measured at Kwajalein Atoll during the 1977 solar minimum. The eastward zonal flow at both stations agrees in magnitude with the average of the DE satellite data, but only the Sao Jose data clearly exhibit the double-humped shape noted in the DE data.

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