Other
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..16...41c&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 16, no. 5, p. (5)41-(5)52
Other
10
Antarctic Regions, Atmospheric Temperature, Diurnal Variations, Geomagnetism, Horizontal Distribution, Nightglow, Solar Activity, Solar Wind, Thermosphere, Azimuth, Emission Spectra, Estimates, Fabry-Perot Interferometers, Optical Measurement, Temperature Gradients, Temperature Measurement, Time Series Analysis
Scientific paper
High-resolution (R=200,000) nighttime Fabry-Perot spectra of the 630 nm thermospheric airglow emission obtained from Mawson, Antarctica, during the Austral winter of 1992 have been used to provide estimates of thermospheric temperature and neutral wind. Virtually all these data consisted of observations taken cyclically in azimuths aligned geographic NESW at 60 degrees zenith angle plus one zenith observation. The data were gathered over 103 observing nights yeilding a total of 9456 usable spectra. Horizontal winds observed on individual nights varied in a continuous manner between two limiting patterns. At one extreme the wind blew at all times in an anti-sunward direction across the pole. The other extreme had antisunward winds around magnetic midnight but sunward wind in the magnetic afternoon and evening sectors and, on some occasions, the morning sector as well. Many nights fell part-way between these extremes with a mixture of both signatures being observed. It is postulated that the relative strengths of the temperature gradient and ion drag forces determined where a given night fell in this continuum of patterns. Averaged winds from subsets of the data selected according to season and magnetic activity were used to examine the relative influences of these factors. We found solar activity variations to be stronger at higher levels of geomagnetic activity. Comparison with the vector spherical harmonic (VSH) wind model was also made. We found VSH also returned winds similar to our observed limiting cases, although it seemed to lack our observed intermediate states. Further, the activity level at which the model returned sunward flow at dusk was lower than that at which such a response appeared in our data.
Conde Maria M.
Dyson Peter L.
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