Latitudinal variation of thermospheric hydrogen near solstice from AE-D observations

Details Latitudinal variation of thermospheric hydrogen near solstice from AE-D observations Latitudinal variation of thermospheric hydrogen near solstice from AE-D observations

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.9945s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Sept. 1, 1988, p. 9945-9957.

Physics

14

Atmospheric Models, F Region, Hydrogen Atoms, Polar Orbits, Solstices, Thermosphere, Explorer 54 Satellite, Polar Regions, Upper Atmosphere

Scientific paper

Variations of thermospheric neutral atomic hydrogen with latitude during a solstice season near solar minimum were investigated using data acquired with the polar-orbiting AE-D satellite. Hydrogen concentrations at low latitude were found to be comparable to those found from observations with the AE-E satellite, but were slightly higher than concentrations derived from the 1983 mass spectrometer incoherent scatter atmospheric model. Results confirm the general summer-to-winter density increase, large latitudinal gradients in the summer hemisphere, and the winter enhancement of hydrogen observed in AE-C nighttime measurements. The AE-D data, however, show a small polar depression in hydrogen concentration at high winter latitudes, attributed to atmospheric dynamics following auroral heating. The density gradients observed by AE-D in the summer hemisphere were in sharp contrast to the more constant horizontal daytime profiles reported from OGO-6 and previous AE-C measurements, indicating the possibility of local time effects.

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