Coherent EISCAT Svalbard Radar spectra from the dayside cusp/cleft and their implications for transient field-aligned currents
Naturally enhanced incoherent scatter spectra from the vicinity of the dayside cusp/cleft, interpreted as being due to plasma turbulence driven by short bursts of intense field-aligned current, are compared with high-resolution narrow-angle auroral images and meridian scanning photometer data. Enhan...
Published in: | Journal of Geophysical Research: Space Physics |
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American Geophysical Union
1999
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Online Access: | https://centaur.reading.ac.uk/38741/ https://centaur.reading.ac.uk/38741/1/179_Sedgemoreetal_1999JA900276.pdf https://doi.org/10.1029/1999JA900276 |
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ftunivreading:oai:centaur.reading.ac.uk:38741 2024-06-23T07:52:27+00:00 Coherent EISCAT Svalbard Radar spectra from the dayside cusp/cleft and their implications for transient field-aligned currents Sedgemore-Schulthess, K. J. F. Lockwood, Mike Trondsen, T. S. Lanchester, B. S. Rees, M. H. Lorentzen, D. A. Moen, J. 1999 text https://centaur.reading.ac.uk/38741/ https://centaur.reading.ac.uk/38741/1/179_Sedgemoreetal_1999JA900276.pdf https://doi.org/10.1029/1999JA900276 en eng American Geophysical Union https://centaur.reading.ac.uk/38741/1/179_Sedgemoreetal_1999JA900276.pdf Sedgemore-Schulthess, K. J. F., Lockwood, M. <https://centaur.reading.ac.uk/view/creators/90001127.html> orcid:0000-0002-7397-2172 , Trondsen, T. S., Lanchester, B. S., Rees, M. H., Lorentzen, D. A. and Moen, J. (1999) Coherent EISCAT Svalbard Radar spectra from the dayside cusp/cleft and their implications for transient field-aligned currents. Journal of Geophysical Research, 104 (A11). pp. 24613-24624. ISSN 0148-0227 doi: https://doi.org/10.1029/1999JA900276 <https://doi.org/10.1029/1999JA900276> Article PeerReviewed 1999 ftunivreading https://doi.org/10.1029/1999JA900276 2024-06-11T15:02:59Z Naturally enhanced incoherent scatter spectra from the vicinity of the dayside cusp/cleft, interpreted as being due to plasma turbulence driven by short bursts of intense field-aligned current, are compared with high-resolution narrow-angle auroral images and meridian scanning photometer data. Enhanced spectra have been observed on many occasions in association with nightside aurora, but there has been only one report of such spectra seen in the cusp/cleft region. Narrow-angle images show considerable change in the aurora on timescales shorter than the 10-s radar integration period, which could explain spectra observed with both ion lines simultaneously enhanced. Enhanced radar spectra are generally seen inside or beside regions of 630-nm auroral emission, indicative of sharp F region conductivity gradients, but there appears also to be a correlation with dynamic, small-scale auroral forms of order 100 m and less in width. Article in Journal/Newspaper EISCAT Svalbard CentAUR: Central Archive at the University of Reading Svalbard Journal of Geophysical Research: Space Physics 104 A11 24613 24624 |
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Open Polar |
collection |
CentAUR: Central Archive at the University of Reading |
op_collection_id |
ftunivreading |
language |
English |
description |
Naturally enhanced incoherent scatter spectra from the vicinity of the dayside cusp/cleft, interpreted as being due to plasma turbulence driven by short bursts of intense field-aligned current, are compared with high-resolution narrow-angle auroral images and meridian scanning photometer data. Enhanced spectra have been observed on many occasions in association with nightside aurora, but there has been only one report of such spectra seen in the cusp/cleft region. Narrow-angle images show considerable change in the aurora on timescales shorter than the 10-s radar integration period, which could explain spectra observed with both ion lines simultaneously enhanced. Enhanced radar spectra are generally seen inside or beside regions of 630-nm auroral emission, indicative of sharp F region conductivity gradients, but there appears also to be a correlation with dynamic, small-scale auroral forms of order 100 m and less in width. |
format |
Article in Journal/Newspaper |
author |
Sedgemore-Schulthess, K. J. F. Lockwood, Mike Trondsen, T. S. Lanchester, B. S. Rees, M. H. Lorentzen, D. A. Moen, J. |
spellingShingle |
Sedgemore-Schulthess, K. J. F. Lockwood, Mike Trondsen, T. S. Lanchester, B. S. Rees, M. H. Lorentzen, D. A. Moen, J. Coherent EISCAT Svalbard Radar spectra from the dayside cusp/cleft and their implications for transient field-aligned currents |
author_facet |
Sedgemore-Schulthess, K. J. F. Lockwood, Mike Trondsen, T. S. Lanchester, B. S. Rees, M. H. Lorentzen, D. A. Moen, J. |
author_sort |
Sedgemore-Schulthess, K. J. F. |
title |
Coherent EISCAT Svalbard Radar spectra from the dayside cusp/cleft and their implications for transient field-aligned currents |
title_short |
Coherent EISCAT Svalbard Radar spectra from the dayside cusp/cleft and their implications for transient field-aligned currents |
title_full |
Coherent EISCAT Svalbard Radar spectra from the dayside cusp/cleft and their implications for transient field-aligned currents |
title_fullStr |
Coherent EISCAT Svalbard Radar spectra from the dayside cusp/cleft and their implications for transient field-aligned currents |
title_full_unstemmed |
Coherent EISCAT Svalbard Radar spectra from the dayside cusp/cleft and their implications for transient field-aligned currents |
title_sort |
coherent eiscat svalbard radar spectra from the dayside cusp/cleft and their implications for transient field-aligned currents |
publisher |
American Geophysical Union |
publishDate |
1999 |
url |
https://centaur.reading.ac.uk/38741/ https://centaur.reading.ac.uk/38741/1/179_Sedgemoreetal_1999JA900276.pdf https://doi.org/10.1029/1999JA900276 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
EISCAT Svalbard |
genre_facet |
EISCAT Svalbard |
op_relation |
https://centaur.reading.ac.uk/38741/1/179_Sedgemoreetal_1999JA900276.pdf Sedgemore-Schulthess, K. J. F., Lockwood, M. <https://centaur.reading.ac.uk/view/creators/90001127.html> orcid:0000-0002-7397-2172 , Trondsen, T. S., Lanchester, B. S., Rees, M. H., Lorentzen, D. A. and Moen, J. (1999) Coherent EISCAT Svalbard Radar spectra from the dayside cusp/cleft and their implications for transient field-aligned currents. Journal of Geophysical Research, 104 (A11). pp. 24613-24624. ISSN 0148-0227 doi: https://doi.org/10.1029/1999JA900276 <https://doi.org/10.1029/1999JA900276> |
op_doi |
https://doi.org/10.1029/1999JA900276 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
104 |
container_issue |
A11 |
container_start_page |
24613 |
op_container_end_page |
24624 |
_version_ |
1802643761971331072 |