Temporal variations in geocoronal Balmer alpha
1968; American Geophysical Union; Volume: 73; Issue: 13 Linguagem: Inglês
10.1029/ja073i013p04139
ISSN2156-2202
Autores Tópico(s)Astrophysics and Cosmic Phenomena
ResumoMeasurements made between May 1965 and November 1967 of the Balmer-α emission arising from Lyman-α scattering in the geocorona have been normalized to remove the effects of geometry of scattering. The remaining variations are interpreted in terms of variations in the column abundance and distribution of hydrogen in the geocorona, variations in the intensity of the line center of the solar Lyman-β flux, and possible variations in molecular oxygen distribution. Diurnal, annual, and solar cycle variations are found, together with probable fluctuations with periods of a few days. It is pointed out that there may be significant variations in hydrogen production rate that affect the column abundance.
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