K.: Aspect sensitive E- and F-region SPEAR-enhanced incoherent backscatter observed by the EISCAT Svalbard radar
Abstract. 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...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.464.14 2023-05-15T16:04:34+02:00 K.: Aspect sensitive E- and F-region SPEAR-enhanced incoherent backscatter observed by the EISCAT Svalbard radar R. S. Dhillon T. R. Robinson T. K. Yeoman The Pennsylvania State University CiteSeerX Archives 2009 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.464.14 http://www.ann-geophys.net/27/65/2009/angeo-27-65-2009.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.464.14 http://www.ann-geophys.net/27/65/2009/angeo-27-65-2009.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.ann-geophys.net/27/65/2009/angeo-27-65-2009.pdf Plasma waves and instabilities text 2009 ftciteseerx 2016-01-08T06:47:51Z Abstract. 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 arti-ficial field-aligned irregularities. These earlier high-latitude results have provided motivation for repeating the investi-gation 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. Text EISCAT Svalbard Unknown Svalbard |
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Open Polar |
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ftciteseerx |
language |
English |
topic |
Plasma waves and instabilities |
spellingShingle |
Plasma waves and instabilities R. S. Dhillon T. R. Robinson T. K. Yeoman K.: Aspect sensitive E- and F-region SPEAR-enhanced incoherent backscatter observed by the EISCAT Svalbard radar |
topic_facet |
Plasma waves and instabilities |
description |
Abstract. 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 arti-ficial field-aligned irregularities. These earlier high-latitude results have provided motivation for repeating the investi-gation 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. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
R. S. Dhillon T. R. Robinson T. K. Yeoman |
author_facet |
R. S. Dhillon T. R. Robinson T. K. Yeoman |
author_sort |
R. S. Dhillon |
title |
K.: Aspect sensitive E- and F-region SPEAR-enhanced incoherent backscatter observed by the EISCAT Svalbard radar |
title_short |
K.: Aspect sensitive E- and F-region SPEAR-enhanced incoherent backscatter observed by the EISCAT Svalbard radar |
title_full |
K.: Aspect sensitive E- and F-region SPEAR-enhanced incoherent backscatter observed by the EISCAT Svalbard radar |
title_fullStr |
K.: Aspect sensitive E- and F-region SPEAR-enhanced incoherent backscatter observed by the EISCAT Svalbard radar |
title_full_unstemmed |
K.: Aspect sensitive E- and F-region SPEAR-enhanced incoherent backscatter observed by the EISCAT Svalbard radar |
title_sort |
k.: aspect sensitive e- and f-region spear-enhanced incoherent backscatter observed by the eiscat svalbard radar |
publishDate |
2009 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.464.14 http://www.ann-geophys.net/27/65/2009/angeo-27-65-2009.pdf |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_source |
http://www.ann-geophys.net/27/65/2009/angeo-27-65-2009.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.464.14 http://www.ann-geophys.net/27/65/2009/angeo-27-65-2009.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766400158221729792 |