High-latitude HF-induced airglow displaced equatorwards of the pump beam

Details High-latitude HF-induced airglow displaced equatorwards of the pump beam High-latitude HF-induced airglow displaced equatorwards of the pump beam

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2817k&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 17, p. 2817-2820

Physics

28

Ionosphere, Ionosphere: Active Experiments, Ionosphere: Auroral Ionosphere, Ionosphere: Particle Acceleration

Scientific paper

HF-induced airglow at 630 nm was observed by the Digital All-sky Imager, located near Skibotn in Norway, at F-region altitudes above the EISCAT HF facility near Tromsø on 21 February 1999. The transmitter was operated in a 4-min on, 4-min off sequence at 4.04 MHz O-mode with the beam pointing vertically. The airglow reached a peak intensity of about 100 R above background and appeared equatorward of the HF beam's projection on the reflection altitude, which was obtained from ionograms. Generally, the region of maximum airglow was displaced towards the magnetic field line (zenithangle=12.8°S) passing through the HF facility. This is a unique feature of these observations. From mid-latitude studies, such airglow is thought to be excited either by electrons energised to several eV by plasma turbulence, or by thermal electron temperature enhancement. Such localisation towards the magnetic field is unexpected for both mechanisms of airglow generation and suggests this feature may be important at high latitudes.

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