Physics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.4491k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, April 1, 1986, p. 4491-4512.
Physics
25
Exosphere, Geocoronal Emissions, H Alpha Line, Radar Measurement, Solar Cycles, Spectral Line Width, Abundance, Airglow, Balmer Series, F Region, Fabry-Perot Interferometers, Hydrogen, Line Spectra, Signal To Noise Ratios
Scientific paper
Meriwether et al. (1980) have shown that it is now possible to retrieve high resolution H-alpha profiles with a ground-based Fabry-Perot interferometer (FPI). The studies conducted revealed the profile asymmetry related to hydrogen escape. The present investigation had the objective to monitor the H-alpha line shape at several phases of a solar cycle. The observational results of six data-taking campaigns at Arecibo are considered. The observations are utilized to study five primary topics relevant to exospheric theory. Attention is given to exospheric hydrogen abundance, exospheric temperature, cooling due to the escape of energetic hydrogen (evaporative cooling), exospheric velocity distribution, and excitation of the H-alpha emission by multiply scattered solar Ly beta radiation. A number of emerging trends are examined.
Atreya Sushil K.
Burnside Roger G.
Kerr Robert B.
Meriwether W. Jr. J.
Tepley Craig A.
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