Short-term EUV flux variations from AE-E He/+/ abundances

Details Short-term EUV flux variations from AE-E He/+/ abundances Short-term EUV flux variations from AE-E He/+/ abundances

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87..246s&link_type=abstract

Journal of Geophysical Research, vol. 87, Jan. 1, 1982, p. 246-248.

Computer Science

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Abundance, Extreme Ultraviolet Radiation, Helium Ions, Radiant Flux Density, Satellite Sounding, Twenty-Seven Day Variation, Atmospheric Ionization, Ion Production Rates, Neutral Particles, Solar Rotation, Thermosphere, Ultraviolet Spectroscopy

Scientific paper

The ionization rate of helium in the thermosphere is inferred from AE-E ion and neutral particle composition measurements made on 20 days from January 1979 to June 1980. The variations in the inferred rate are consistent with variations in the UV flux measured during the same period by the AE-E UV spectrometer. The approximately 27-day modulation of the calculated ionization rate is the result of cyclical variations in the UV flux, which are in turn coupled to the rotation period of the sun. Results indicate that the ionization structure of helium in the thermosphere is closely coupled to both the long and short term EUV flux variations.

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