Low-latitude aurorae and storm time current systems

Details Low-latitude aurorae and storm time current systems Low-latitude aurorae and storm time current systems

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9111257t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Oct. 1, 1986, p. 11257-11269. CNPq-supported research.

Physics

32

Auroras, Magnetic Storms, Molecular Oscillations, Nitrogen Ions, Emission Spectra, Ion Motion, Positive Ions, Ring Currents, Time Response, Vibrational Spectra

Scientific paper

The spectral characteristics of low-latitude aurorae recorded during the last 60 years, especially the vibrational populations for the N2(+) B 2 Sigma(u)+ state which give rise to the N2(+) 1 N bands, are studied in order to evaluate contributions from several excitation mechanisms. Latitude variations of vibrational development and emission rate are examined, and the time variation of some low-latitude displays are compared with the magnetic signatures from nearby observatories in order to identify characteristics of the associated storm time current systems. The brighter low-latitude aurorae are found down to about 40 deg dip latitude, and the vibrational development of the N2(+) 1 N bands indicates the excitation at least some of the time is due to precipitating O(+) ions.

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