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

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 vertic...

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Main Authors: Kosch, M. J., Rietveld, M. T., Hagfors, T., Leyser, T. B.
Format: Article in Journal/Newspaper
Language:unknown
Published: 2000
Subjects:
Online Access:https://eprints.lancs.ac.uk/id/eprint/6590/
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record_format openpolar
spelling ftulancaster:oai:eprints.lancs.ac.uk:6590 2023-08-27T04:09:14+02:00 High-latitude HF-induced airglow displaced equatorwards of the pump beam Kosch, M. J. Rietveld, M. T. Hagfors, T. Leyser, T. B. 2000-09 https://eprints.lancs.ac.uk/id/eprint/6590/ unknown 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 Journal Article PeerReviewed 2000 ftulancaster 2023-08-03T22:16:10Z 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. Article in Journal/Newspaper EISCAT Skibotn Tromsø Lancaster University: Lancaster Eprints Norway Tromsø
institution Open Polar
collection Lancaster University: Lancaster Eprints
op_collection_id ftulancaster
language unknown
description 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.
format Article in Journal/Newspaper
author Kosch, M. J.
Rietveld, M. T.
Hagfors, T.
Leyser, T. B.
spellingShingle Kosch, M. J.
Rietveld, M. T.
Hagfors, T.
Leyser, T. B.
High-latitude HF-induced airglow displaced equatorwards of the pump beam
author_facet Kosch, M. J.
Rietveld, M. T.
Hagfors, T.
Leyser, T. B.
author_sort Kosch, M. J.
title High-latitude HF-induced airglow displaced equatorwards of the pump beam
title_short High-latitude HF-induced airglow displaced equatorwards of the pump beam
title_full High-latitude HF-induced airglow displaced equatorwards of the pump beam
title_fullStr High-latitude HF-induced airglow displaced equatorwards of the pump beam
title_full_unstemmed High-latitude HF-induced airglow displaced equatorwards of the pump beam
title_sort high-latitude hf-induced airglow displaced equatorwards of the pump beam
publishDate 2000
url https://eprints.lancs.ac.uk/id/eprint/6590/
geographic Norway
Tromsø
geographic_facet Norway
Tromsø
genre EISCAT
Skibotn
Tromsø
genre_facet EISCAT
Skibotn
Tromsø
op_relation 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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