EISCAT Svalbard radar observations of SPEAR-induced E- and F-region spectral enhancements in the polar cap ionosphere
The Space Plasma Exploration by Active Radar (SPEAR) facility has successfully operated in the high-power heater and low-power radar modes and has returned its first results. The high-power results include observations of SPEAR-induced ion and plasma line spectral enhancements recorded by the EISCAT...
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Copernicus Publications on behalf of the European Geosciences Union (EGU)
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Online Access: | http://www.ann-geophys.net/25/1801/2007/ http://hdl.handle.net/2381/8119 https://doi.org/10.5194/angeo-25-1801-2007 |
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ftleicester:oai:lra.le.ac.uk:2381/8119 2023-05-15T16:04:32+02:00 EISCAT Svalbard radar observations of SPEAR-induced E- and F-region spectral enhancements in the polar cap ionosphere Dhillon, R. S. Robinson, T. R. Yeoman, Tim K. 2010-06-28T15:48:04Z http://www.ann-geophys.net/25/1801/2007/ http://hdl.handle.net/2381/8119 https://doi.org/10.5194/angeo-25-1801-2007 en eng Copernicus Publications on behalf of the European Geosciences Union (EGU) Radio and Space Plasma Physics Annales Geophysicae, 2007, 25 (8), pp. 1801-1814. 0992-7689 http://www.ann-geophys.net/25/1801/2007/ http://hdl.handle.net/2381/8119 doi:10.5194/angeo-25-1801-2007 This paper was published as Annales Geophysicae, 2007, 25 (8), pp. 1801-1814. It is also available from http://www.ann-geophys.net/25/1801/2007/angeo-25-1801-2007.html. Doi:10.5194/angeo-25-1801-2007 © Author(s) 2007. This work is distributed under the Creative Commons Attribution 3.0 License. CC-BY Article 2010 ftleicester https://doi.org/10.5194/angeo-25-1801-2007 2019-03-22T20:14:12Z The Space Plasma Exploration by Active Radar (SPEAR) facility has successfully operated in the high-power heater and low-power radar modes and has returned its first results. The high-power results include observations of SPEAR-induced ion and plasma line spectral enhancements recorded by the EISCAT Svalbard UHF incoherent scatter radar system (ESR), which is collocated with SPEAR. These SPEAR-enhanced spectra possess features that are consistent with excitation of both the purely growing mode and the parametric decay instability. In this paper, we present observations of upper and lower E-region SPEAR-induced ion and plasma line enhancements, together with F-region spectral enhancements, which indicate excitation of both instabilities and which are consistent with previous theoretical treatments of instability excitation in sporadic E-layers. In agreement with previous observations, spectra from the lower E-region have the single-peaked form characteristic of collisional plasma. Our observations of the SPEAR-enhanced E-region spectra suggest the presence of variable drifting regions of patchy overdense plasma, which is a finding also consistent with previous results. Article in Journal/Newspaper EISCAT Svalbard University of Leicester: Leicester Research Archive (LRA) Svalbard Annales Geophysicae 25 8 1801 1814 |
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Open Polar |
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University of Leicester: Leicester Research Archive (LRA) |
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ftleicester |
language |
English |
description |
The Space Plasma Exploration by Active Radar (SPEAR) facility has successfully operated in the high-power heater and low-power radar modes and has returned its first results. The high-power results include observations of SPEAR-induced ion and plasma line spectral enhancements recorded by the EISCAT Svalbard UHF incoherent scatter radar system (ESR), which is collocated with SPEAR. These SPEAR-enhanced spectra possess features that are consistent with excitation of both the purely growing mode and the parametric decay instability. In this paper, we present observations of upper and lower E-region SPEAR-induced ion and plasma line enhancements, together with F-region spectral enhancements, which indicate excitation of both instabilities and which are consistent with previous theoretical treatments of instability excitation in sporadic E-layers. In agreement with previous observations, spectra from the lower E-region have the single-peaked form characteristic of collisional plasma. Our observations of the SPEAR-enhanced E-region spectra suggest the presence of variable drifting regions of patchy overdense plasma, which is a finding also consistent with previous results. |
format |
Article in Journal/Newspaper |
author |
Dhillon, R. S. Robinson, T. R. Yeoman, Tim K. |
spellingShingle |
Dhillon, R. S. Robinson, T. R. Yeoman, Tim K. EISCAT Svalbard radar observations of SPEAR-induced E- and F-region spectral enhancements in the polar cap ionosphere |
author_facet |
Dhillon, R. S. Robinson, T. R. Yeoman, Tim K. |
author_sort |
Dhillon, R. S. |
title |
EISCAT Svalbard radar observations of SPEAR-induced E- and F-region spectral enhancements in the polar cap ionosphere |
title_short |
EISCAT Svalbard radar observations of SPEAR-induced E- and F-region spectral enhancements in the polar cap ionosphere |
title_full |
EISCAT Svalbard radar observations of SPEAR-induced E- and F-region spectral enhancements in the polar cap ionosphere |
title_fullStr |
EISCAT Svalbard radar observations of SPEAR-induced E- and F-region spectral enhancements in the polar cap ionosphere |
title_full_unstemmed |
EISCAT Svalbard radar observations of SPEAR-induced E- and F-region spectral enhancements in the polar cap ionosphere |
title_sort |
eiscat svalbard radar observations of spear-induced e- and f-region spectral enhancements in the polar cap ionosphere |
publisher |
Copernicus Publications on behalf of the European Geosciences Union (EGU) |
publishDate |
2010 |
url |
http://www.ann-geophys.net/25/1801/2007/ http://hdl.handle.net/2381/8119 https://doi.org/10.5194/angeo-25-1801-2007 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_relation |
Radio and Space Plasma Physics Annales Geophysicae, 2007, 25 (8), pp. 1801-1814. 0992-7689 http://www.ann-geophys.net/25/1801/2007/ http://hdl.handle.net/2381/8119 doi:10.5194/angeo-25-1801-2007 |
op_rights |
This paper was published as Annales Geophysicae, 2007, 25 (8), pp. 1801-1814. It is also available from http://www.ann-geophys.net/25/1801/2007/angeo-25-1801-2007.html. Doi:10.5194/angeo-25-1801-2007 © Author(s) 2007. This work is distributed under the Creative Commons Attribution 3.0 License. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/angeo-25-1801-2007 |
container_title |
Annales Geophysicae |
container_volume |
25 |
container_issue |
8 |
container_start_page |
1801 |
op_container_end_page |
1814 |
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1766400121667321856 |