Physics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.2314t&link_type=abstract
Journal of Geophysical Research, vol. 86, Apr. 1, 1981, p. 2314-2316.
Physics
7
Emission Spectra, Metastable State, Nitrogen Ions, Thermosphere, Twilight Glow, Atmospheric Ionization, Electron Transitions, Extreme Ultraviolet Radiation, Photodissociation, Solar Radiation, Spectrophotometry, Spectrum Analysis
Scientific paper
Measurements are reported of the 5755-A emission arising from the transition N(+)(1D-1S) made at Sutherland, South Africa (32.4 deg S, 20.8 deg E). The surface brightness of the emission in mid-November 1977 decayed from approximately 5 R at 10 solar depression angle (SDA) to approximately 1 R at 15 deg SDA. By the use of these data, it has been determined that less than 5% of all N2 ionizations result in the production of N(+) ions in the 1S state. Quenching of N(+)(1S) by neutral constituents and electrons is found to be negligible above 220 km in the twilight thermosphere in November and December 1977. Measurements of the 5755-A emission therefore potentially provide a ground based means of measuring the N2 density in the twilight thermosphere.
Burnside R.
Meriwether W. Jr. J.
Torr Douglas G.
Torr Marsha R.
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