Other
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...100.5757s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 100, no. A4, p. 5757-5768
Other
2
Abundance, Diurnal Variations, F Region, Horizontal Distribution, Hydrogen Atoms, Satellite Observation, Summer, Thermosphere, Atmospheric Models, Atmospheric Temperature, Charge Exchange, Explorer 51 Satellite, Geotemperature, In Situ Measurement, Mass Spectrometers, Solstices
Scientific paper
We describe saellite observations and analyses leading to the abundance of neutral atomic hydrogen near 300 km and its horizontal distribution with latitude and local time through the summer thermosphere. These H concentrations were derived from the charge-exchange equilibrium relationship between hydrogen and oxygen atoms and ions, with basic in situ measurements accomplished in the F region with the Atmospheric Explorer-C (AE-C) satellite around the June 1974 solstice near a solar minimum. Critical observational information concerning the low ion densities of H(+) was provided by the magnetic ion mass spectrometer (MIMS) on board this spacecraft. We demonstrate reasonable consistency of the broad horizontal behavior with other available observations and the mass spectrometer/incoherent scatter 1986 atmospheric model, both for the extensively studied diurnal variation at low latitude and the lesser-known latiudinal dependence. We include a brief discussion regarding the observed relationship between the local H concentration and the temperature as they vary through the summer thermosphere, noting distinctly different power law behaviors in the hydrogen distribution for temperatures lesser and greater than approximately 800 K.
Breig Edward L.
Coley William R.
Sanatani S.
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