Plasma line observations in the auroral oval

Details Plasma line observations in the auroral oval Plasma line observations in the auroral oval

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.1997v&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, March 1, 1988, p. 1997-2003.

Physics

13

Auroral Spectroscopy, Auroral Zones, Plasma Spectra, Incoherent Scatter Radar, Line Spectra, Radar Scattering

Scientific paper

This paper reports on a series of experiments conducted at the Sondre Stromfjord incoherent scatter radar, aimed at detecting enhanced plasma lines associated with midnight sector auroral arcs. Using different receivers, both ion and plasma lines were detected simultaneously. The plasma line signal was recorded with the use of a filter bank of eight frequencies. Plasma lines were found to originate mainly from the topside of the particle-produced E layer. The enhanced plasma lines are sometimes a factor of 100 times larger than the thermal level. The data show a rapid decay of the plasma lines, however. In some cases, only a 30-s integration time was needed in order to unambiguously detect both upshifted and downshifted lines. The level of the plasma lines reaches values of up to 40 K above the noise temperature. These are considerably higher than results from prior auroral zone plasma line experiments.

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