Nightglow /557.7 nm of OI/ in the central polar cap

Details Nightglow /557.7 nm of OI/ in the central polar cap Nightglow /557.7 nm of OI/ in the central polar cap

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25...23m&link_type=abstract

Planetary and Space Science, vol. 25, Jan. 1977, p. 23-38.

Physics

Auroral Spectroscopy, Nightglow, Oxygen Spectra, Polar Caps, Diurnal Variations, Spectrophotometry, Sunspots

Scientific paper

The atomic oxygen green line intensity at 557.7 nm was measured by ground-based photometers at Thule Air Base, Greenland, during the winter months of 1972-1973 and 1974-1975. The 557.7 nm night airglow in the polar cap exhibited no diurnal variation; a sector influence, increasing in a + sector and decreasing in a - sector; no correlation with magnetic indices after removing sector influence; a bimodal distribution of daily averages; long-term variations with an average factor of 6.1 over an average period of 10.2 days; and a positive trend with sunspot number. These findings are analyzed in terms of the Barth and Chapman mechanisms, and it is hypothesized that the observed 557.7 nm airglow variations are accounted for by meridional winds carrying atomic oxygen northward into the central polar cap from the auroral oval.

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