The Auroral 2145Å feature

Details The Auroral 2145Å feature The Auroral 2145Å feature

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..603d&link_type=abstract

Geophysical Research Letters, Volume 8, Issue 6, p. 603-606

Physics

30

Scientific paper

Laboratory data are used to argue that the excitation of the N II doublet near 2145Å by electron impact on N2 occurs through the ejection of an electron from the 2sσg orbital. The cross section probably exceeds 10-18 cm2, as is required if electron impact excitation of N2 is the source of the auroral feature. By extrapolation along the isoelectronic sequence, we estimate a lifetime of 5.8 ms, in harmony with recent ab initio calculations. The auroral observations then imply a rate coefficient for quenching of N+(5So2) ions in the atmosphere of less than 10-10 cm3 s-1.

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