Physics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.3284i&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, April 1, 1987, p. 3284-3292.
Physics
9
Auroral Ionization, Helium Ions, Magnetic Storms, Oxygen Ions, Particle Precipitation, Elastic Scattering, Light (Visible Radiation), Neutral Atmospheres
Scientific paper
Ground-based spectral observations of a midlatitude aurora on Sept. 22, 1982 indicated that the observed emissions were caused by either O(+) or H(+) energetic ions. In this paper, the model of Ishimoto et al. (1986) is used to simulate the interaction between precipitating energetic He(+) and a neutral atmosphere of He, O, and N2, computing the atmospheric impacts in terms of heating, ionization, and excitation of certain emissions and comparing the results with those obtained earlier with O(+) as the energetic flux. It was found that, of the total energy influx, approximately 50 percent goes into ionization, compared with 2 percent in the case of O(+), and 40 percent is backscattered or escapes, compared with 16 percent in the case of O(+). By contrast, He(+) is much less efficient at heating the atmosphere and does not excite the N2 2P system. It is concluded that the aurora observed on Sept. 22 is well explained by an influx of energetic O(+) together with a 6 percent admixture of He(+).
Ishimoto Michi
Torr Marsha R.
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