Solar cycle variations of geocoronal Balmer alpha emission

Details Solar cycle variations of geocoronal Balmer alpha emission Solar cycle variations of geocoronal Balmer alpha emission

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3669n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A3, p. 3669-3676.

Astronomy and Astrophysics

Astronomy

19

Alpha Particles, Balmer Series, Exosphere, Geocoronal Emissions, Solar Cycles, Fabry-Perot Interferometers, Lyman Beta Radiation

Scientific paper

Results are presented of observations of the geocoronal Balmer alpha nightglow with a double-etalon, pressure-scanned, 15-cm aperture Fabry-Perot interferometer for more than a solar cycle with an internally consistent intensity reference to standard astronomical nebulae. The data make it possible to examine solar cycle influence on the midlatitude exosphere and to address questions concerning the degree to which the exosphere is locally static or changing. No statistically significant variations are found throughout the solar cycle when the variation with viewing geometry is removed by normalizing the data to reference exospheric model predictions by Anderson et al. (1987). The relative intensity dependence on solar depression angle does show a solar cycle variation. A possible related variation in the exospheric hydrogen density profile is suggested.

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