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Proceedings Paper

Calculations and observations of proton precipitation in the dayside aurora
Author(s): Fred Sigernes; G. J. Fasel; C. S. Deehr
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Paper Abstract

A simple procedure to evaluate the Balmer excitation rates of H(alpha ) and H(beta ) to produce the corresponding volume emission rates vs. height, using semi-empirical range relations of protons in air, is used. The calculations are carried out with identified ion-energy particle spectra of the dayside aurora obtained by low altitude satellites. It is found that the calculated emission intensities of H(alpha ) and H(beta ) are observable for ground-based optical detection. Measurements of the dayside aurora at Longyearbyen, Svalbard, are discussed in relation to these calculations. Furthermore, it is observed pulsed proton events on the dayside which have decreasing time between each event show increase in the emission intensity and a fluctuating behavior in the primary initial proton energy. Each pulsed proton event was associated with an enhancement in the green 5577 angstrom emission, and some corresponded to poleward-moving auroral forms.

Paper Details

Date Published: 23 November 1993
PDF: 10 pages
Proc. SPIE 2050, Airglow and Aurora, (23 November 1993); doi: 10.1117/12.164808
Show Author Affiliations
Fred Sigernes, Univ. of Alaska/Fairbanks (Norway)
G. J. Fasel, Univ. of Alaska/Fairbanks (United States)
C. S. Deehr, Univ. of Alaska/Fairbanks (United States)

Published in SPIE Proceedings Vol. 2050:
Airglow and Aurora
Sergej Leontyev, Editor(s)

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