Aspect angle sensitivity of pump-induced optical emissions at EISCAT
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 mag...
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ftleicesterunfig:oai:figshare.com:article/10153244 2023-05-15T16:04:34+02:00 Aspect angle sensitivity of pump-induced optical emissions at EISCAT M. J. Kosch C. Bryers M. T. Rietveld Timothy Kenneth Yeoman Y. Ogawa 2014-12-04T00:00:00Z https://figshare.com/articles/journal_contribution/Aspect_angle_sensitivity_of_pump-induced_optical_emissions_at_EISCAT/10153244 unknown 2381/36446 https://figshare.com/articles/journal_contribution/Aspect_angle_sensitivity_of_pump-induced_optical_emissions_at_EISCAT/10153244 All Rights Reserved Uncategorized Science & Technology Physical Sciences Geosciences Multidisciplinary Geology Wave plasma interaction Ionosphere Aspect angle POWER RADIO-WAVES ENHANCED AIRGLOW SURA FACILITY HF FREQUENCY IRREGULARITIES LATITUDES SUPERDARN PLASMA HEATER Text Journal contribution 2014 ftleicesterunfig 2021-11-11T19:43:23Z 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. Other Non-Article Part of Journal/Newspaper EISCAT University of Leicester: Figshare Norway Ramfjord ENVELOPE(11.589,11.589,64.910,64.910) Sura ENVELOPE(34.333,34.333,67.917,67.917) |
institution |
Open Polar |
collection |
University of Leicester: Figshare |
op_collection_id |
ftleicesterunfig |
language |
unknown |
topic |
Uncategorized Science & Technology Physical Sciences Geosciences Multidisciplinary Geology Wave plasma interaction Ionosphere Aspect angle POWER RADIO-WAVES ENHANCED AIRGLOW SURA FACILITY HF FREQUENCY IRREGULARITIES LATITUDES SUPERDARN PLASMA HEATER |
spellingShingle |
Uncategorized Science & Technology Physical Sciences Geosciences Multidisciplinary Geology Wave plasma interaction Ionosphere Aspect angle POWER RADIO-WAVES ENHANCED AIRGLOW SURA FACILITY HF FREQUENCY IRREGULARITIES LATITUDES SUPERDARN PLASMA HEATER M. J. Kosch C. Bryers M. T. Rietveld Timothy Kenneth Yeoman Y. Ogawa Aspect angle sensitivity of pump-induced optical emissions at EISCAT |
topic_facet |
Uncategorized Science & Technology Physical Sciences Geosciences Multidisciplinary Geology Wave plasma interaction Ionosphere Aspect angle POWER RADIO-WAVES ENHANCED AIRGLOW SURA FACILITY HF FREQUENCY IRREGULARITIES LATITUDES SUPERDARN PLASMA HEATER |
description |
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 |
Other Non-Article Part of Journal/Newspaper |
author |
M. J. Kosch C. Bryers M. T. Rietveld Timothy Kenneth Yeoman Y. Ogawa |
author_facet |
M. J. Kosch C. Bryers M. T. Rietveld Timothy Kenneth Yeoman Y. Ogawa |
author_sort |
M. J. Kosch |
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 |
publishDate |
2014 |
url |
https://figshare.com/articles/journal_contribution/Aspect_angle_sensitivity_of_pump-induced_optical_emissions_at_EISCAT/10153244 |
long_lat |
ENVELOPE(11.589,11.589,64.910,64.910) ENVELOPE(34.333,34.333,67.917,67.917) |
geographic |
Norway Ramfjord Sura |
geographic_facet |
Norway Ramfjord Sura |
genre |
EISCAT |
genre_facet |
EISCAT |
op_relation |
2381/36446 https://figshare.com/articles/journal_contribution/Aspect_angle_sensitivity_of_pump-induced_optical_emissions_at_EISCAT/10153244 |
op_rights |
All Rights Reserved |
_version_ |
1766400163497115648 |