Aspect sensitive E- and F-region SPEAR-enhanced incoherent backscatter observed by the EISCAT Svalbard radar
Previous studies of the aspect sensitivity of heater-enhanced incoherent radar backscatter in the high-latitude ionosphere have demonstrated the directional dependence of incoherent scatter signatures corresponding to artificially excited electrostatic waves, together with consistent field-aligned s...
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Copernicus Publications on behalf of the European Geosciences Union (EGU)
2010
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Online Access: | http://www.ann-geophys.net/27/65/2009/ http://hdl.handle.net/2381/8175 https://doi.org/10.5194/angeo-27-65-2009 |
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ftleicester:oai:lra.le.ac.uk:2381/8175 2023-05-15T16:04:34+02:00 Aspect sensitive E- and F-region SPEAR-enhanced incoherent backscatter observed by the EISCAT Svalbard radar Dhillon, R. S. Robinson, T. R. Yeoman, Tim K. 2010-07-06T14:49:12Z http://www.ann-geophys.net/27/65/2009/ http://hdl.handle.net/2381/8175 https://doi.org/10.5194/angeo-27-65-2009 en eng Copernicus Publications on behalf of the European Geosciences Union (EGU) Radio and Space Plasma Physics Annales Geophysicae, 2009, 27 (1, Special Issue), pp. 65-81. 0992-7689 http://www.ann-geophys.net/27/65/2009/ http://hdl.handle.net/2381/8175 doi:10.5194/angeo-27-65-2009 This paper was published as Annales Geophysicae, 2009, 27 (1, Special Issue), pp. 65-81. It is also available from http://www.ann-geophys.net/27/65/2009/angeo-27-65-2009.html. Doi:10.5194/angeo-27-65-2009 Article 2010 ftleicester https://doi.org/10.5194/angeo-27-65-2009 2019-03-22T20:14:13Z Previous studies of the aspect sensitivity of heater-enhanced incoherent radar backscatter in the high-latitude ionosphere have demonstrated the directional dependence of incoherent scatter signatures corresponding to artificially excited electrostatic waves, together with consistent field-aligned signatures that may be related to the presence of artificial field-aligned irregularities. These earlier high-latitude results have provided motivation for repeating the investigation in the different geophysical conditions that obtain in the polar cap ionosphere. The Space Plasma Exploration by Active Radar (SPEAR) facility is located within the polar cap and has provided observations of RF-enhanced ion and plasma line spectra recorded by the EISCAT Svalbard UHF incoherent scatter radar system (ESR), which is collocated with SPEAR. In this paper, we present observations of aspect sensitive E- and F-region SPEAR-induced ion and plasma line enhancements that indicate excitation of both the purely growing mode and the parametric decay instability, together with sporadic E-layer results that may indicate the presence of cavitons. We note consistent enhancements from field-aligned, vertical and also from 5° south of field-aligned. We attribute the prevalence of vertical scatter to the importance of the Spitze region, and of that from field-aligned to possible wave/irregularity coupling. Article in Journal/Newspaper EISCAT Svalbard University of Leicester: Leicester Research Archive (LRA) Svalbard Annales Geophysicae 27 1 65 81 |
institution |
Open Polar |
collection |
University of Leicester: Leicester Research Archive (LRA) |
op_collection_id |
ftleicester |
language |
English |
description |
Previous studies of the aspect sensitivity of heater-enhanced incoherent radar backscatter in the high-latitude ionosphere have demonstrated the directional dependence of incoherent scatter signatures corresponding to artificially excited electrostatic waves, together with consistent field-aligned signatures that may be related to the presence of artificial field-aligned irregularities. These earlier high-latitude results have provided motivation for repeating the investigation in the different geophysical conditions that obtain in the polar cap ionosphere. The Space Plasma Exploration by Active Radar (SPEAR) facility is located within the polar cap and has provided observations of RF-enhanced ion and plasma line spectra recorded by the EISCAT Svalbard UHF incoherent scatter radar system (ESR), which is collocated with SPEAR. In this paper, we present observations of aspect sensitive E- and F-region SPEAR-induced ion and plasma line enhancements that indicate excitation of both the purely growing mode and the parametric decay instability, together with sporadic E-layer results that may indicate the presence of cavitons. We note consistent enhancements from field-aligned, vertical and also from 5° south of field-aligned. We attribute the prevalence of vertical scatter to the importance of the Spitze region, and of that from field-aligned to possible wave/irregularity coupling. |
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. Aspect sensitive E- and F-region SPEAR-enhanced incoherent backscatter observed by the EISCAT Svalbard radar |
author_facet |
Dhillon, R. S. Robinson, T. R. Yeoman, Tim K. |
author_sort |
Dhillon, R. S. |
title |
Aspect sensitive E- and F-region SPEAR-enhanced incoherent backscatter observed by the EISCAT Svalbard radar |
title_short |
Aspect sensitive E- and F-region SPEAR-enhanced incoherent backscatter observed by the EISCAT Svalbard radar |
title_full |
Aspect sensitive E- and F-region SPEAR-enhanced incoherent backscatter observed by the EISCAT Svalbard radar |
title_fullStr |
Aspect sensitive E- and F-region SPEAR-enhanced incoherent backscatter observed by the EISCAT Svalbard radar |
title_full_unstemmed |
Aspect sensitive E- and F-region SPEAR-enhanced incoherent backscatter observed by the EISCAT Svalbard radar |
title_sort |
aspect sensitive e- and f-region spear-enhanced incoherent backscatter observed by the eiscat svalbard radar |
publisher |
Copernicus Publications on behalf of the European Geosciences Union (EGU) |
publishDate |
2010 |
url |
http://www.ann-geophys.net/27/65/2009/ http://hdl.handle.net/2381/8175 https://doi.org/10.5194/angeo-27-65-2009 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_relation |
Radio and Space Plasma Physics Annales Geophysicae, 2009, 27 (1, Special Issue), pp. 65-81. 0992-7689 http://www.ann-geophys.net/27/65/2009/ http://hdl.handle.net/2381/8175 doi:10.5194/angeo-27-65-2009 |
op_rights |
This paper was published as Annales Geophysicae, 2009, 27 (1, Special Issue), pp. 65-81. It is also available from http://www.ann-geophys.net/27/65/2009/angeo-27-65-2009.html. Doi:10.5194/angeo-27-65-2009 |
op_doi |
https://doi.org/10.5194/angeo-27-65-2009 |
container_title |
Annales Geophysicae |
container_volume |
27 |
container_issue |
1 |
container_start_page |
65 |
op_container_end_page |
81 |
_version_ |
1766400160850509824 |