Physics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..172m&link_type=abstract
Geophysical Research Letters, vol. 10, Feb. 1983, p. 172-175.
Physics
3
Auroral Ionization, Daytime, Magnetic Storms, Nitrogen Ions, Airglow, Magnetosheath, Molecular Spectra, Night
Scientific paper
The presence of (NII) lines in auroral spectra has been noted in the earliest auroral spectra discussed by Vegard (1932). Atomic nitrogen is a minor constituent in the undisturbed atmosphere. In the auroral region, it is produced by impact dissociation of N2 by incoming energetic electrons. The spectra presented in connection with the current investigation were taken near Longyearbyen, Spitzbergen during local magnetic noon conditions where the emissions mainly originate from species excited by magnetosheath electrons of energies less than 100 eV. This gives rise to a spectrum which is significantly different from that of night-time aurora. Especially noticeable in the cusp spectra are the lack of the molecular emissions normally arising from excitation by more energetic particles.
Deehr Charles S.
Myrabo H. K.
Sivjee G. G.
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