Atomic nitrogen abundance in polar upper thermosphere

Details Atomic nitrogen abundance in polar upper thermosphere Atomic nitrogen abundance in polar upper thermosphere

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..349s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, April 1983, p. 349-352.

Physics

3

Atmospheric Composition, Auroras, Nitrogen Atoms, Polar Regions, Thermosphere, Abundance, Emission Spectra, Infrared Spectra, Line Spectra, Night Sky

Scientific paper

Results of observations are presented which show that in night-time auroras teh intensity of highly excited (n much greater than 3) N I line emissions is much less than 1 percent of the red and near-IR N2 1PG as well as N2(+)M Delta v = 3 band emissions, while in mid-day cusp auroras the ratio is greater than 10 percent. These results indicate that the electron impact on N, rather than on N2, is the main source of some of the mid-day auroral N I line emissions. It is shown that in order to produce the measured level of N I 6945-51 and 6979-82A emissions due to the impact of cusp electrons on N, the daytime polar thermospheric density of atomic nitrogen above 200 km is required to be in excess of 10 to the 7th/cu cm.

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