Spectral characteristics of two types of low latitude aurorae

Details Spectral characteristics of two types of low latitude aurorae Spectral characteristics of two types of low latitude aurorae

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..572t&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 11, June 1984, p. 572-575.

Physics

23

Auroral Spectroscopy, Emission Spectra, Oxygen Spectra, Tropical Regions, Electrons, Energy Dissipation, Ions, Neutral Particles, Nitrogen, Ring Currents, Spectral Bands

Scientific paper

Attention is given to two types of aurorae whose low altitude emissions seem to be due to energy loss from trapped ring current ions or electrons whose energy is of the order of 1 eV. The spectral characteristics which predominate in the first type of aurora indicate direct precipitation of ring current particles as ions, and/or indirect precipitation as energetic neutrals, following charge transfer with exospheric H or O neutrals. The spectral characteristics of the second type indicate excitation by electrons and can yield brighter displays. The time variations of the emissions are found to be closely related to fluctuations of periods shorter than an hour in the magnetograms from nearby observatories.

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