Strongly enhanced incoherent-scatter plasma lines in aurora

Details Strongly enhanced incoherent-scatter plasma lines in aurora Strongly enhanced incoherent-scatter plasma lines in aurora

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10021343k&link_type=abstract

Journal of Geophysical Research, Volume 100, Issue A11, p. 21343-21356

Physics

4

Ionosphere: Auroral Ionosphere, Ionosphere: Instruments And Techniques, Ionosphere: Plasma Waves And Instabilities, Ionosphere: Plasma Temperature And Density

Scientific paper

Observations of incoherent-scatter plasma-line intensities, measured in the E-region with the European Incoherent Scatter UHF radar, during auroral precipitation, are presented. Intensities up to 200 times the thermal level were observed in a restricted frequency interval from 5.5 to 6.5 MHz. Intensities were lower at both higher and lower frequencies. The intensities are compared with quantitative estimates based on model suprathermal electron fluxes for the prevailing conditions. The minimum in suprathermal electron fluxes between 2 and 4 eV, which is caused by the excitation of vibrational levels in N2, is found to result in a minimum in expected plasma-line damping and a maximum in intensity between 5.5 and 6.5 MHz, for the EISCAT UHF wavelength. Good agreement is found between the calculated and observed intensities.

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