Aspect angle sensitivity of pump-induced optical emissions at EISCAT
Abstract We investigate the aspect angle sensitivity of the pump-induced artificial optical emissions in the ionosphere over the European Incoherent Scatter Scientific Association (EISCAT) high-frequency transmitter facility at Ramfjord, Norway, as a function of the pump beam launch angle relative t...
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Springer Science and Business Media LLC
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crspringernat:10.1186/s40623-014-0159-x 2023-05-15T16:04:33+02:00 Aspect angle sensitivity of pump-induced optical emissions at EISCAT Kosch, Michael J Bryers, Carl Rietveld, Michael T Yeoman, Timothy K Ogawa, Yasunobu 2014 http://dx.doi.org/10.1186/s40623-014-0159-x http://link.springer.com/content/pdf/10.1186/s40623-014-0159-x.pdf http://link.springer.com/article/10.1186/s40623-014-0159-x/fulltext.html http://link.springer.com/content/pdf/10.1186/s40623-014-0159-x https://link.springer.com/content/pdf/10.1186/s40623-014-0159-x.pdf en eng Springer Science and Business Media LLC http://creativecommons.org/licenses/by/4.0 CC-BY Earth, Planets and Space volume 66, issue 1 ISSN 1880-5981 Space and Planetary Science Geology journal-article 2014 crspringernat https://doi.org/10.1186/s40623-014-0159-x 2022-01-04T16:47:53Z Abstract We investigate the aspect angle sensitivity of the pump-induced artificial optical emissions in the ionosphere over the European Incoherent Scatter Scientific Association (EISCAT) high-frequency transmitter facility at Ramfjord, Norway, as a function of the pump beam launch angle relative to the magnetic field line direction. The highest intensity optical emissions occur when the pump beam pointing direction is in the magnetic zenith (approximately 12° S of local zenith). For pump beam directions further north from field aligned, the optical emission intensity decreases for the same pump power. In addition, the primary photon-emitting region becomes displaced towards the magnetic zenith relative to the pump beam and for larger aspect angles, the brightest emissions were found to be outside the −3-dB pump beam width. The Cooperative UK Twin-Located Auroral Sounding System (CUTLASS) coherent scatter high-frequency (HF) radar detected a quasi-constant level of backscatter power from the pumped ionosphere, indicating that saturated striations were formed for all pump beam directions. This indicates that the presence of upper-hybrid resonance is not sufficient to explain the angular sensitivity of the optical emissions. Article in Journal/Newspaper EISCAT Springer Nature (via Crossref) Norway Ramfjord ENVELOPE(11.589,11.589,64.910,64.910) Earth, Planets and Space 66 1 |
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Springer Nature (via Crossref) |
op_collection_id |
crspringernat |
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English |
topic |
Space and Planetary Science Geology |
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Space and Planetary Science Geology Kosch, Michael J Bryers, Carl Rietveld, Michael T Yeoman, Timothy K Ogawa, Yasunobu Aspect angle sensitivity of pump-induced optical emissions at EISCAT |
topic_facet |
Space and Planetary Science Geology |
description |
Abstract We investigate the aspect angle sensitivity of the pump-induced artificial optical emissions in the ionosphere over the European Incoherent Scatter Scientific Association (EISCAT) high-frequency transmitter facility at Ramfjord, Norway, as a function of the pump beam launch angle relative to the magnetic field line direction. The highest intensity optical emissions occur when the pump beam pointing direction is in the magnetic zenith (approximately 12° S of local zenith). For pump beam directions further north from field aligned, the optical emission intensity decreases for the same pump power. In addition, the primary photon-emitting region becomes displaced towards the magnetic zenith relative to the pump beam and for larger aspect angles, the brightest emissions were found to be outside the −3-dB pump beam width. The Cooperative UK Twin-Located Auroral Sounding System (CUTLASS) coherent scatter high-frequency (HF) radar detected a quasi-constant level of backscatter power from the pumped ionosphere, indicating that saturated striations were formed for all pump beam directions. This indicates that the presence of upper-hybrid resonance is not sufficient to explain the angular sensitivity of the optical emissions. |
format |
Article in Journal/Newspaper |
author |
Kosch, Michael J Bryers, Carl Rietveld, Michael T Yeoman, Timothy K Ogawa, Yasunobu |
author_facet |
Kosch, Michael J Bryers, Carl Rietveld, Michael T Yeoman, Timothy K Ogawa, Yasunobu |
author_sort |
Kosch, Michael J |
title |
Aspect angle sensitivity of pump-induced optical emissions at EISCAT |
title_short |
Aspect angle sensitivity of pump-induced optical emissions at EISCAT |
title_full |
Aspect angle sensitivity of pump-induced optical emissions at EISCAT |
title_fullStr |
Aspect angle sensitivity of pump-induced optical emissions at EISCAT |
title_full_unstemmed |
Aspect angle sensitivity of pump-induced optical emissions at EISCAT |
title_sort |
aspect angle sensitivity of pump-induced optical emissions at eiscat |
publisher |
Springer Science and Business Media LLC |
publishDate |
2014 |
url |
http://dx.doi.org/10.1186/s40623-014-0159-x http://link.springer.com/content/pdf/10.1186/s40623-014-0159-x.pdf http://link.springer.com/article/10.1186/s40623-014-0159-x/fulltext.html http://link.springer.com/content/pdf/10.1186/s40623-014-0159-x https://link.springer.com/content/pdf/10.1186/s40623-014-0159-x.pdf |
long_lat |
ENVELOPE(11.589,11.589,64.910,64.910) |
geographic |
Norway Ramfjord |
geographic_facet |
Norway Ramfjord |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
Earth, Planets and Space volume 66, issue 1 ISSN 1880-5981 |
op_rights |
http://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1186/s40623-014-0159-x |
container_title |
Earth, Planets and Space |
container_volume |
66 |
container_issue |
1 |
_version_ |
1766400148788740096 |