Observations of unusually broadened HF radar spectra from heater-induced artificial plasma irregularities
[1] Cooperative UK Twin-Located Auroral Sounding System (CUTLASS) HF backscatter targets may be artificially produced using the European Incoherent Scatter (EISCAT) HF ionospheric modification facility at Tromsø, Norway. Plasma irregularities created in this way are known to be highly field aligned...
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American Geophysical Union (AGU); Wiley
2012
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Online Access: | http://hdl.handle.net/2381/20911 http://onlinelibrary.wiley.com/doi/10.1029/2010JA015516/abstract https://doi.org/10.1029/2010JA015516 |
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ftleicester:oai:lra.le.ac.uk:2381/20911 2023-05-15T16:04:35+02:00 Observations of unusually broadened HF radar spectra from heater-induced artificial plasma irregularities Vickers, H. Robinson, T. 2012-10-24T09:09:04Z http://hdl.handle.net/2381/20911 http://onlinelibrary.wiley.com/doi/10.1029/2010JA015516/abstract https://doi.org/10.1029/2010JA015516 English eng American Geophysical Union (AGU); Wiley Journal of Geophysical Research-SPACE PHYSICS, 2011, 116 0148-0227 http://hdl.handle.net/2381/20911 http://onlinelibrary.wiley.com/doi/10.1029/2010JA015516/abstract doi:10.1029/2010JA015516 Copyright © 2011 by the American Geophysical Union. All rights reserved. Archived with reference to Usage Permissions granted to authors, available at http://publications.agu.org/author-resource-center/usage-permissions/ Web of Science http://webofknowledge.com Science & Technology Physical Sciences Astronomy & Astrophysics FIELD-ALIGNED IRREGULARITIES IONOSPHERIC IRREGULARITIES RESOLUTION OBSERVATIONS EISCAT RADARS BACKSCATTER TROMSO CUTLASS WIDTH BOUNDARIES SIGNATURES Journal Article 2012 ftleicester https://doi.org/10.1029/2010JA015516 2019-03-22T20:17:18Z [1] Cooperative UK Twin-Located Auroral Sounding System (CUTLASS) HF backscatter targets may be artificially produced using the European Incoherent Scatter (EISCAT) HF ionospheric modification facility at Tromsø, Norway. Plasma irregularities created in this way are known to be highly field aligned and usually give rise to radar echoes possessing spectral widths that are much lower than those seen in natural radar auroral data. In this study we present CUTLASS Finland and Iceland observations of heater-induced irregularities; these irregularities gave rise to enhanced spectral width in the Iceland radar backscatter signal, while the width observed by the Finland radar, pointing almost orthogonal to the Iceland beams, remained low. The observations coincided with a period of disturbed ionospheric conditions when faster-flowing natural irregularities were present, poleward of the heated volume, as well as a flow gradient across the heated volume itself. A latitudinal variation of the Doppler velocity measurements was exhibited in both the Finland and Iceland radar observations. We suggest that this flow inhomogeneity, taken together with the geometry of the observing radar beams, would explain not only the broad spectrum of flow components across the heated volume detected by the Iceland radar but also the asymmetry between the spectral widths measured at Iceland and Finland. Peer-reviewed Publisher Version 53453 Article in Journal/Newspaper EISCAT Iceland Tromso Tromso Tromsø University of Leicester: Leicester Research Archive (LRA) Norway Tromsø Tromso ENVELOPE(16.546,16.546,68.801,68.801) Journal of Geophysical Research: Space Physics 116 A5 |
institution |
Open Polar |
collection |
University of Leicester: Leicester Research Archive (LRA) |
op_collection_id |
ftleicester |
language |
English |
topic |
Science & Technology Physical Sciences Astronomy & Astrophysics FIELD-ALIGNED IRREGULARITIES IONOSPHERIC IRREGULARITIES RESOLUTION OBSERVATIONS EISCAT RADARS BACKSCATTER TROMSO CUTLASS WIDTH BOUNDARIES SIGNATURES |
spellingShingle |
Science & Technology Physical Sciences Astronomy & Astrophysics FIELD-ALIGNED IRREGULARITIES IONOSPHERIC IRREGULARITIES RESOLUTION OBSERVATIONS EISCAT RADARS BACKSCATTER TROMSO CUTLASS WIDTH BOUNDARIES SIGNATURES Vickers, H. Robinson, T. Observations of unusually broadened HF radar spectra from heater-induced artificial plasma irregularities |
topic_facet |
Science & Technology Physical Sciences Astronomy & Astrophysics FIELD-ALIGNED IRREGULARITIES IONOSPHERIC IRREGULARITIES RESOLUTION OBSERVATIONS EISCAT RADARS BACKSCATTER TROMSO CUTLASS WIDTH BOUNDARIES SIGNATURES |
description |
[1] Cooperative UK Twin-Located Auroral Sounding System (CUTLASS) HF backscatter targets may be artificially produced using the European Incoherent Scatter (EISCAT) HF ionospheric modification facility at Tromsø, Norway. Plasma irregularities created in this way are known to be highly field aligned and usually give rise to radar echoes possessing spectral widths that are much lower than those seen in natural radar auroral data. In this study we present CUTLASS Finland and Iceland observations of heater-induced irregularities; these irregularities gave rise to enhanced spectral width in the Iceland radar backscatter signal, while the width observed by the Finland radar, pointing almost orthogonal to the Iceland beams, remained low. The observations coincided with a period of disturbed ionospheric conditions when faster-flowing natural irregularities were present, poleward of the heated volume, as well as a flow gradient across the heated volume itself. A latitudinal variation of the Doppler velocity measurements was exhibited in both the Finland and Iceland radar observations. We suggest that this flow inhomogeneity, taken together with the geometry of the observing radar beams, would explain not only the broad spectrum of flow components across the heated volume detected by the Iceland radar but also the asymmetry between the spectral widths measured at Iceland and Finland. Peer-reviewed Publisher Version 53453 |
format |
Article in Journal/Newspaper |
author |
Vickers, H. Robinson, T. |
author_facet |
Vickers, H. Robinson, T. |
author_sort |
Vickers, H. |
title |
Observations of unusually broadened HF radar spectra from heater-induced artificial plasma irregularities |
title_short |
Observations of unusually broadened HF radar spectra from heater-induced artificial plasma irregularities |
title_full |
Observations of unusually broadened HF radar spectra from heater-induced artificial plasma irregularities |
title_fullStr |
Observations of unusually broadened HF radar spectra from heater-induced artificial plasma irregularities |
title_full_unstemmed |
Observations of unusually broadened HF radar spectra from heater-induced artificial plasma irregularities |
title_sort |
observations of unusually broadened hf radar spectra from heater-induced artificial plasma irregularities |
publisher |
American Geophysical Union (AGU); Wiley |
publishDate |
2012 |
url |
http://hdl.handle.net/2381/20911 http://onlinelibrary.wiley.com/doi/10.1029/2010JA015516/abstract https://doi.org/10.1029/2010JA015516 |
long_lat |
ENVELOPE(16.546,16.546,68.801,68.801) |
geographic |
Norway Tromsø Tromso |
geographic_facet |
Norway Tromsø Tromso |
genre |
EISCAT Iceland Tromso Tromso Tromsø |
genre_facet |
EISCAT Iceland Tromso Tromso Tromsø |
op_source |
Web of Science http://webofknowledge.com |
op_relation |
Journal of Geophysical Research-SPACE PHYSICS, 2011, 116 0148-0227 http://hdl.handle.net/2381/20911 http://onlinelibrary.wiley.com/doi/10.1029/2010JA015516/abstract doi:10.1029/2010JA015516 |
op_rights |
Copyright © 2011 by the American Geophysical Union. All rights reserved. Archived with reference to Usage Permissions granted to authors, available at http://publications.agu.org/author-resource-center/usage-permissions/ |
op_doi |
https://doi.org/10.1029/2010JA015516 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
116 |
container_issue |
A5 |
_version_ |
1766400173254115328 |