Measurement of geocoronal Balmer alpha in the auroral zone

Details Measurement of geocoronal Balmer alpha in the auroral zone Measurement of geocoronal Balmer alpha in the auroral zone

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...101..189k&link_type=abstract

Journal of Geophysical Research, Volume 101, Issue A1, p. 189-194

Physics

3

Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Thermosphere-Composition And Chemistry, Atmospheric Composition And Structure: Transmission And Scattering Of Radiation, Ionosphere: Auroral Ionosphere

Scientific paper

A Fabry-Perot spectrometer is used at Sondre Stromfjord, Greenland, during periods of quiet auroral conditions to isolate the resonant fluorescent component of the geocoronal atomic hydrogen Balmer alpha emission. The data demonstrate that we can detect a weak, 8-rayleigh emission with signal-to-noise ratio of 6 using 25-min of integration. Moreover, these observations have sufficient spectral resolution to determine effective exospheric temperatures with statistical uncertainties of about 35%. Energetic neutral hydrogen, due presumably to neutralized proton precipitation, appears in the line profile background, and as such, is distinct from the quiescent, less energetic, geocoronal component excited by resonant fluorescence of solar Lyman beta photons.

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