High resolution observations of spectral width features associatedwith 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...
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ftdoajarticles:oai:doaj.org/article:83d37160360d4f0da8acd2b214531631 2023-05-15T16:04:45+02:00 High resolution observations of spectral width features associatedwith ULF wave signatures in artificial HF radar backscatter D. M. Wright T. K. Yeoman L. J. Baddeley J. A. Davies R. S. Dhillon M. Lester S. E. Milan E. E. Woodfield 2004-01-01T00:00:00Z https://doi.org/10.5194/angeo-22-169-2004 https://doaj.org/article/83d37160360d4f0da8acd2b214531631 EN eng Copernicus Publications https://www.ann-geophys.net/22/169/2004/angeo-22-169-2004.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-22-169-2004 0992-7689 1432-0576 https://doaj.org/article/83d37160360d4f0da8acd2b214531631 Annales Geophysicae, Vol 22, Pp 169-182 (2004) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2004 ftdoajarticles https://doi.org/10.5194/angeo-22-169-2004 2022-12-31T04:23:13Z 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. Key words. Magnetospheric physics (MHD waves and instabilities) – Space plasma physics (wave-particle interactions) – Ionosphere (active experiments) Article in Journal/Newspaper EISCAT Northern Norway Tromsø Directory of Open Access Journals: DOAJ Articles Norway Tromsø Annales Geophysicae 22 1 169 182 |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
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Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 D. M. Wright T. K. Yeoman L. J. Baddeley J. A. Davies R. S. Dhillon M. Lester S. E. Milan E. E. Woodfield High resolution observations of spectral width features associatedwith ULF wave signatures in artificial HF radar backscatter |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
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. Key words. Magnetospheric physics (MHD waves and instabilities) – Space plasma physics (wave-particle interactions) – Ionosphere (active experiments) |
format |
Article in Journal/Newspaper |
author |
D. M. Wright T. K. Yeoman L. J. Baddeley J. A. Davies R. S. Dhillon M. Lester S. E. Milan E. E. Woodfield |
author_facet |
D. M. Wright T. K. Yeoman L. J. Baddeley J. A. Davies R. S. Dhillon M. Lester S. E. Milan E. E. Woodfield |
author_sort |
D. M. Wright |
title |
High resolution observations of spectral width features associatedwith ULF wave signatures in artificial HF radar backscatter |
title_short |
High resolution observations of spectral width features associatedwith ULF wave signatures in artificial HF radar backscatter |
title_full |
High resolution observations of spectral width features associatedwith ULF wave signatures in artificial HF radar backscatter |
title_fullStr |
High resolution observations of spectral width features associatedwith ULF wave signatures in artificial HF radar backscatter |
title_full_unstemmed |
High resolution observations of spectral width features associatedwith ULF wave signatures in artificial HF radar backscatter |
title_sort |
high resolution observations of spectral width features associatedwith ulf wave signatures in artificial hf radar backscatter |
publisher |
Copernicus Publications |
publishDate |
2004 |
url |
https://doi.org/10.5194/angeo-22-169-2004 https://doaj.org/article/83d37160360d4f0da8acd2b214531631 |
geographic |
Norway Tromsø |
geographic_facet |
Norway Tromsø |
genre |
EISCAT Northern Norway Tromsø |
genre_facet |
EISCAT Northern Norway Tromsø |
op_source |
Annales Geophysicae, Vol 22, Pp 169-182 (2004) |
op_relation |
https://www.ann-geophys.net/22/169/2004/angeo-22-169-2004.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-22-169-2004 0992-7689 1432-0576 https://doaj.org/article/83d37160360d4f0da8acd2b214531631 |
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 |
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1766400371067977728 |