Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11509306g&link_type=abstract
Journal of Geophysical Research, Volume 115, Issue A9, CiteID A09306
Astronomy and Astrophysics
Astrophysics
Atmospheric Composition And Structure: Airglow And Aurora, Ionosphere: Auroral Ionosphere (2704), Ionosphere: Particle Precipitation, Solar Physics, Astrophysics, And Astronomy: General Or Miscellaneous
Scientific paper
The H Balmer emissions were first identified in terrestrial aurora by Vegard (1939). The earliest photographic spectral observations are reviewed. In the subsequent decade, the intensity ratios for Hα, Hβ, and Hγ were measured, and the well-known line broadening and blue shift were established. Recently, the Hα, Hγ, Hδ, and H$\varepsilon$ features have been measured by OSIRIS on Odin. The Balmer components are resolved from other auroral features using sets of synthetic spectra. The measured intensity ratios are in good agreement with an extensive set of published model calculations. The presented observations are in the polar region averaged over limb tangent altitudes from 100 to 105 km, approximately perpendicular to the terrestrial magnetic field lines, for this geometry showing Doppler broadening without obvious Doppler shifts. The OSIRIS-measured full-width at half-height of the Hα feature is 2.2 nm corresponding to an H atom velocity of 500 km s-1 and energy approximately 1.3 keV.
Bourassa Adam E.
Degenstein Douglas Arthur
Egeland A. A.
Gattinger Richard L.
Llewellyn Edam J.
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