The profile of the hydrogen <formula alphabet="latin">Hβ emission line in proton aurora

Details The profile of the hydrogen <formula alphabet="latin">Hβ emission line in proton aurora The profile of the hydrogen <formula alphabet="latin">Hβ emission line in proton aurora

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...106...23l&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A1, p. 23-32

Physics

22

Atmospheric Composition And Structure: Airglow And Aurora, Ionosphere: Auroral Ionosphere, Ionosphere: Particle Precipitation, Ionosphere: Instruments And Techniques

Scientific paper

Models of hydrogen-proton transport in proton aurora predict the line profile of the hydrogen emissions from specified incident proton precipitation. We are using a model that includes collisional angular redistribution which leads to upward moving proton and hydrogen fluxes. For ground-based observation in the magnetic zenith this causes a small Doppler broadening toward the red in the line profile. The precipitating energetic hydrogen atoms are responsible for the prominent Doppler shift toward the blue. The resulting line profile has thus both a widened red and a widened blue wing. Using a spectrometer with sufficient spectral resolution to distinguish the red-shifted wing of the line from the instrumental line broadening, we obtain Hβ line profiles (486.1 nm). Comparing the predicted line shapes to our observations, we find the red-shifted wing is due to upward moving hydrogen as predicted by the angular redistribution in the model calculations. The shape of the blue-shifted wing, rather than the location of the peak of the blue-shifted line profile, is a suitable indicator of the mean energy of the precipitating proton flux.

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