High resolution observations of spectral width features associated with ULF wave signatures in artificial HF radar backscatter
The EISCAT high power heating facility at Tromsø, northern Norway, has been utilised to generate artificial radar backscatter in the fields of view of the CUTLASS HF radars. It has been demonstrated that this technique offers a means of making very accurate and high resolution observations of natura...
Published in: | Annales Geophysicae |
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Language: | English |
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European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany)
2009
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Online Access: | http://www.ann-geophys.net/22/169/2004/angeo-22-169-2004.html http://hdl.handle.net/2381/712 https://doi.org/10.5194/angeo-22-169-2004 |
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ftleicester:oai:lra.le.ac.uk:2381/712 2023-05-15T16:04:43+02:00 High resolution observations of spectral width features associated with ULF wave signatures in artificial HF radar backscatter Wright, D. M. Yeoman, Tim K. Baddeley, L. J. Davies, J. A. Dhillon, R. Lester, M. Milan, Steve E. Woodfield, E. E. 2009-12-08T16:24:11Z http://www.ann-geophys.net/22/169/2004/angeo-22-169-2004.html http://hdl.handle.net/2381/712 https://doi.org/10.5194/angeo-22-169-2004 en eng European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany) RAE 2007 Radio and Space Plasma Physics Annales Geophysicae, 2004, 22(1), pp.169-182 http://www.ann-geophys.net/22/169/2004/angeo-22-169-2004.html http://hdl.handle.net/2381/712 doi:10.5194/angeo-22-169-2004 Available from the publisher website at http://www.ann-geophys.net/22/169/2004/angeo-22-169-2004.html © Author(s) 2004. This work is distributed under the Creative Commons Attribution 3.0 License. CC-BY Magnetospheric physics (MHD waves and instabilities) Space plasma physics (wave-particle interactions) Ionosphere (active experiments) Article 2009 ftleicester https://doi.org/10.5194/angeo-22-169-2004 2019-03-22T20:13:54Z The EISCAT high power heating facility at Tromsø, northern Norway, has been utilised to generate artificial radar backscatter in the fields of view of the CUTLASS HF radars. It has been demonstrated that this technique offers a means of making very accurate and high resolution observations of naturally occurring ULF waves. During such experiments, the usually narrow radar spectral widths associated with artificial irregularities increase at times when small scale-sized (high m-number) ULF waves are observed. Possible mechanisms by which these particle-driven high-m waves may modify the observed spectral widths have been investigated. The results are found to be consistent with Pc1 (ion-cyclotron) wave activity, causing aliasing of the radar spectra, in agreement with previous modelling work. The observations also support recent suggestions that Pc1 waves may be modulated by the action of longer period ULF standing waves, which are simultaneously detected on the magnetospheric field lines. Drifting ring current protons with energies of ∼ 10keV are indicated as a common plasma source population for both wave types. Article in Journal/Newspaper EISCAT Northern Norway Tromsø University of Leicester: Leicester Research Archive (LRA) Norway Tromsø Annales Geophysicae 22 1 169 182 |
institution |
Open Polar |
collection |
University of Leicester: Leicester Research Archive (LRA) |
op_collection_id |
ftleicester |
language |
English |
topic |
Magnetospheric physics (MHD waves and instabilities) Space plasma physics (wave-particle interactions) Ionosphere (active experiments) |
spellingShingle |
Magnetospheric physics (MHD waves and instabilities) Space plasma physics (wave-particle interactions) Ionosphere (active experiments) Wright, D. M. Yeoman, Tim K. Baddeley, L. J. Davies, J. A. Dhillon, R. Lester, M. Milan, Steve E. Woodfield, E. E. High resolution observations of spectral width features associated with ULF wave signatures in artificial HF radar backscatter |
topic_facet |
Magnetospheric physics (MHD waves and instabilities) Space plasma physics (wave-particle interactions) Ionosphere (active experiments) |
description |
The EISCAT high power heating facility at Tromsø, northern Norway, has been utilised to generate artificial radar backscatter in the fields of view of the CUTLASS HF radars. It has been demonstrated that this technique offers a means of making very accurate and high resolution observations of naturally occurring ULF waves. During such experiments, the usually narrow radar spectral widths associated with artificial irregularities increase at times when small scale-sized (high m-number) ULF waves are observed. Possible mechanisms by which these particle-driven high-m waves may modify the observed spectral widths have been investigated. The results are found to be consistent with Pc1 (ion-cyclotron) wave activity, causing aliasing of the radar spectra, in agreement with previous modelling work. The observations also support recent suggestions that Pc1 waves may be modulated by the action of longer period ULF standing waves, which are simultaneously detected on the magnetospheric field lines. Drifting ring current protons with energies of ∼ 10keV are indicated as a common plasma source population for both wave types. |
format |
Article in Journal/Newspaper |
author |
Wright, D. M. Yeoman, Tim K. Baddeley, L. J. Davies, J. A. Dhillon, R. Lester, M. Milan, Steve E. Woodfield, E. E. |
author_facet |
Wright, D. M. Yeoman, Tim K. Baddeley, L. J. Davies, J. A. Dhillon, R. Lester, M. Milan, Steve E. Woodfield, E. E. |
author_sort |
Wright, D. M. |
title |
High resolution observations of spectral width features associated with ULF wave signatures in artificial HF radar backscatter |
title_short |
High resolution observations of spectral width features associated with ULF wave signatures in artificial HF radar backscatter |
title_full |
High resolution observations of spectral width features associated with ULF wave signatures in artificial HF radar backscatter |
title_fullStr |
High resolution observations of spectral width features associated with ULF wave signatures in artificial HF radar backscatter |
title_full_unstemmed |
High resolution observations of spectral width features associated with ULF wave signatures in artificial HF radar backscatter |
title_sort |
high resolution observations of spectral width features associated with ulf wave signatures in artificial hf radar backscatter |
publisher |
European Geosciences Union (EGU), Copernicus Publications, Springer Verlag (Germany) |
publishDate |
2009 |
url |
http://www.ann-geophys.net/22/169/2004/angeo-22-169-2004.html http://hdl.handle.net/2381/712 https://doi.org/10.5194/angeo-22-169-2004 |
geographic |
Norway Tromsø |
geographic_facet |
Norway Tromsø |
genre |
EISCAT Northern Norway Tromsø |
genre_facet |
EISCAT Northern Norway Tromsø |
op_relation |
RAE 2007 Radio and Space Plasma Physics Annales Geophysicae, 2004, 22(1), pp.169-182 http://www.ann-geophys.net/22/169/2004/angeo-22-169-2004.html http://hdl.handle.net/2381/712 doi:10.5194/angeo-22-169-2004 |
op_rights |
Available from the publisher website at http://www.ann-geophys.net/22/169/2004/angeo-22-169-2004.html © Author(s) 2004. This work is distributed under the Creative Commons Attribution 3.0 License. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/angeo-22-169-2004 |
container_title |
Annales Geophysicae |
container_volume |
22 |
container_issue |
1 |
container_start_page |
169 |
op_container_end_page |
182 |
_version_ |
1766400350131060736 |