Ground-based observations of F region aurora associated with the magnetospheric cusp

Details Ground-based observations of F region aurora associated with the magnetospheric cusp Ground-based observations of F region aurora associated with the magnetospheric cusp

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.2185d&link_type=abstract

Journal of Geophysical Research, vol. 85, May 1, 1980, p. 2185-2192. Research supported by the Norges Teknisk-Naturvitenskapeli

Physics

7

Arctic Regions, Auroras, F Region, Magnetospheric Instability, Emission Spectra, Luminous Intensity, Nitrogen, Oxygen Spectra, Spectrophotometry, Winds Aloft

Scientific paper

Observations are reported concerning the temporal and spatial variations of the particle precipitation region characterized by a predominance of O I forbidden line emission at 6300 A and associated with the magnetospheric cusp. The relative values of the intensity ratios of 4278-A N2(+), and of the O I forbidden lines at 5577 A and at 6300 A were compared, revealing a considerable variation in the energy of the incoming electrons during magnetic activity. Results indicate that resonance scattering is the most important source of N2(+) ING emission in the quiet daytime cusp aurora, and that the intensity ratio of 6300 A/5577 A emissions is a better index of incoming particle energy than 6300 A/4278 A. It is also found that the observed N2(+) 4278-A emission is greater than would be expected for impact excitation alone, and that the midday gap in 5577-A emission is simply a result of the low characteristic energy of the incoming particle spectrum.

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