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

Kosch, M. J. and Rietveld, M. T. and Hagfors, T. and Leyser, T. B. (2000) High-latitude HF-induced airglow displaced equatorwards of the pump beam. Geophysical Research Letters, 27 (17). pp. 2817-2820. ISSN 0094-8276

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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 (zenith angle = 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.

Item Type: Journal Article
Journal or Publication Title: Geophysical Research Letters
Uncontrolled Keywords: /dk/atira/pure/researchoutput/libraryofcongress/t1
Departments: Faculty of Science and Technology > School of Computing & Communications
Faculty of Science and Technology > Physics
ID Code: 6590
Deposited By: ep_importer_dcs
Deposited On: 21 Apr 2008 10:33
Refereed?: Yes
Published?: Published
Last Modified: 01 Jan 2020 07:12
URI: https://eprints.lancs.ac.uk/id/eprint/6590

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