Anomalous vibrational distribution of N2/+/ 1 NG emissions from a proton aurora

Details Anomalous vibrational distribution of N2/+/ 1 NG emissions from a proton aurora Anomalous vibrational distribution of N2/+/ 1 NG emissions from a proton aurora

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85..206s&link_type=abstract

Journal of Geophysical Research, vol. 85, Jan. 1, 1980, p. 206-212.

Physics

Geophysics

2

Auroral Spectroscopy, Nitrogen Ions, Optical Emission Spectroscopy, Proton Precipitation, Spectral Energy Distribution, Vibrational Spectra, Geophysics, H Beta Line, Oxygen Spectra, Proton Energy, Spectrophotometry

Scientific paper

The relative vibrational population of N2(+)(B2Sigma u +) in a rare proton aurora, observed on March 8 (UT) 1978, was twice as high as the values found in almost all the nighttime auroras. On the basis of various laboratory measurements the proton aurora observations point to precipitation of 1.2 keV protons, carrying an energy flux of 14 ergs/ sq cm s. Simultaneous measurements of N2(+) 1 NG (0, 1), (1, 2), (0, 2), and (1, 3) bands as well as H beta and O I forbidden line 6300 A emissions from this proton aurora yield H-beta/N2(+) 1 NG (0, 2) roughly equal to 3 and forbidden line O I/N2(+) 1 NG (0, 1) roughly equal to 2.4. The corresponding values in the auroras excited predominantly by electrons are generally low. Most of the N2(+) 1 NG emissions from proton auroras are excited by protons interacting with N2.

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