Physics
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976georl...3..455k&link_type=abstract
Geophysical Research Letters, vol. 3, Aug. 1976, p. 455-458.
Physics
1
Aeronomy, Mass Spectrometers, Nitrogen Ions, Oxygen Ions, Satellite-Borne Instruments, Thermosphere, Annual Variations, Atmospheric Models, Diurnal Variations, Explorer Satellites, Geomagnetic Latitude, Molecular Diffusion, Solstices
Scientific paper
Utilizing the fly-through mode, the open source neutral mass spectrometer on Atmosphere Explorer-D (AE-D) has measured O2 densities, as well as N2 densities and in situ neutral temperatures, at midmorning during winter solstice over the latitude range 90 degrees S to 90 degrees N. The expected seasonal variation in N2 was found at 200 km together with a more complex behavior in molecular oxygen than might be expected from a diffusive equilibrium model with constant lower boundary values. Under geomagnetically quiet conditions the equatorial 200 km value of O2 was about 1.7 x 10 to the 8th/cu cm. A local maximum in the 200 km O2 densities was found near 70 degrees N, where an average quiet time value was 2.5 x 10 to the 8th/cu cm, implying a 120 km density of 8.3 x 10 to the 10th/cu cm. The in situ temperature measurements confirm the presence of higher temperatures near 70 degrees N latitude, even during geomagnetically quiet conditions.
Kayser David C.
Potter W. E.
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