Physics
Scientific paper
Mar 1967
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967jatp...29..251b&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 29, no. 3, pp. 251-258
Physics
1
Scientific paper
An examination is made of the excitation processes leading to population of the molecular nitrogen states C3IIu and B3IIg under auroral conditions. The conclusions are applied here especially to the 1PG, and a number of recent measurements of auroral 1PG emission are considered in the light of the excitation rate tables of this investigation. The requirement of consistency between the measured relative photon output of the 1PG and the 2PG and the capabilities of the possible sources of excitation for the two systems confirms earlier conclusions that electron impingement predominates over cascading in the excitation of the auroral 1PG. Cascading from the 2PG appears to contribute from 6 to 10 per cent to the emission from the 1PG, a somewhat lower figure than that obtained by Broadfoot and Hunten. On the basis of the auroral data considered, a tentative conclusion has been drawn that the total emission rate of the 2PG is largely independent of the auroral intensity (from IBC III to IBC IV), while there is a significant variation in the corresponding rate of the 1PG.
Benesch William
Tilford Shelby G.
Vanderslice Joseph T.
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