Upstream-generated Pc3 ULF wave signatures observed near the Earth's cusp
[1] Pc3 pulsations (frequency ∼20–100 mHz) which originate in the ion foreshock upstream of the Earth's bow shock due to the interaction between reflected ions and the solar wind are frequently observed in ground-based pulsation magnetometer data. Previous studies have noted increased Pc3 wave...
Published in: | Journal of Geophysical Research: Space Physics |
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2012
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Online Access: | http://hdl.handle.net/2381/13666 http://onlinelibrary.wiley.com/doi/10.1029/2011JA017327/abstract https://doi.org/10.1029/2011JA017327 |
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ftleicester:oai:lra.le.ac.uk:2381/13666 2023-05-15T18:29:50+02:00 Upstream-generated Pc3 ULF wave signatures observed near the Earth's cusp Yeoman, T. K. Wright, D. M. Engebretson, M. J. Pilipenko, V. A. Lessard, M. R. Kim, H. 2012-10-24T08:56:56Z http://hdl.handle.net/2381/13666 http://onlinelibrary.wiley.com/doi/10.1029/2011JA017327/abstract https://doi.org/10.1029/2011JA017327 unknown American Geophysical Union (AGU); Wiley Journal of Geophysical Research A: SPACE PHYSICS, 2012, 117 (3) 0148-0227 http://hdl.handle.net/2381/13666 http://onlinelibrary.wiley.com/doi/10.1029/2011JA017327/abstract doi:10.1029/2011JA017327 Copyright © 2012 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/ Scopus http://www.scopus.com/home.url Journal Article 2012 ftleicester https://doi.org/10.1029/2011JA017327 2019-03-22T20:15:30Z [1] Pc3 pulsations (frequency ∼20–100 mHz) which originate in the ion foreshock upstream of the Earth's bow shock due to the interaction between reflected ions and the solar wind are frequently observed in ground-based pulsation magnetometer data. Previous studies have noted increased Pc3 wave power in the vicinity of the dayside cusp and inferred that the upstream waves gained entry via the cusp, although more recent studies have revealed a more complex picture. Here, we examine Pc3 wave power near local noon observed by search coil magnetometers at three closely-spaced stations on Svalbard, during times when an extended interval of HF radar backscatter indicative of the cusp is detected by the Hankasalmi SuperDARN radar. The location of the equatorward edge of the HF radar cusp may then be directly compared with the Pc3 wave power measured at three latitudes as the cusp migrates across the stations on a statistical basis. These observations are more consistent with wave entry to the magnetosphere along closed field lines equatorward of the cusp via the ionospheric transistor mechanism of Engebretson et al. (1991a), or weakly coupled fast and Alfvén wave modes, which then map to the low-latitude boundary layer or outer magnetosphere, rather than with wave entry into the magnetosphere via the cusp proper or exterior cusp. Peer-reviewed Publisher Version 119640 Article in Journal/Newspaper Svalbard University of Leicester: Leicester Research Archive (LRA) Svalbard Journal of Geophysical Research: Space Physics 117 A3 n/a n/a |
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Open Polar |
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University of Leicester: Leicester Research Archive (LRA) |
op_collection_id |
ftleicester |
language |
unknown |
description |
[1] Pc3 pulsations (frequency ∼20–100 mHz) which originate in the ion foreshock upstream of the Earth's bow shock due to the interaction between reflected ions and the solar wind are frequently observed in ground-based pulsation magnetometer data. Previous studies have noted increased Pc3 wave power in the vicinity of the dayside cusp and inferred that the upstream waves gained entry via the cusp, although more recent studies have revealed a more complex picture. Here, we examine Pc3 wave power near local noon observed by search coil magnetometers at three closely-spaced stations on Svalbard, during times when an extended interval of HF radar backscatter indicative of the cusp is detected by the Hankasalmi SuperDARN radar. The location of the equatorward edge of the HF radar cusp may then be directly compared with the Pc3 wave power measured at three latitudes as the cusp migrates across the stations on a statistical basis. These observations are more consistent with wave entry to the magnetosphere along closed field lines equatorward of the cusp via the ionospheric transistor mechanism of Engebretson et al. (1991a), or weakly coupled fast and Alfvén wave modes, which then map to the low-latitude boundary layer or outer magnetosphere, rather than with wave entry into the magnetosphere via the cusp proper or exterior cusp. Peer-reviewed Publisher Version 119640 |
format |
Article in Journal/Newspaper |
author |
Yeoman, T. K. Wright, D. M. Engebretson, M. J. Pilipenko, V. A. Lessard, M. R. Kim, H. |
spellingShingle |
Yeoman, T. K. Wright, D. M. Engebretson, M. J. Pilipenko, V. A. Lessard, M. R. Kim, H. Upstream-generated Pc3 ULF wave signatures observed near the Earth's cusp |
author_facet |
Yeoman, T. K. Wright, D. M. Engebretson, M. J. Pilipenko, V. A. Lessard, M. R. Kim, H. |
author_sort |
Yeoman, T. K. |
title |
Upstream-generated Pc3 ULF wave signatures observed near the Earth's cusp |
title_short |
Upstream-generated Pc3 ULF wave signatures observed near the Earth's cusp |
title_full |
Upstream-generated Pc3 ULF wave signatures observed near the Earth's cusp |
title_fullStr |
Upstream-generated Pc3 ULF wave signatures observed near the Earth's cusp |
title_full_unstemmed |
Upstream-generated Pc3 ULF wave signatures observed near the Earth's cusp |
title_sort |
upstream-generated pc3 ulf wave signatures observed near the earth's cusp |
publisher |
American Geophysical Union (AGU); Wiley |
publishDate |
2012 |
url |
http://hdl.handle.net/2381/13666 http://onlinelibrary.wiley.com/doi/10.1029/2011JA017327/abstract https://doi.org/10.1029/2011JA017327 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Svalbard |
genre_facet |
Svalbard |
op_source |
Scopus http://www.scopus.com/home.url |
op_relation |
Journal of Geophysical Research A: SPACE PHYSICS, 2012, 117 (3) 0148-0227 http://hdl.handle.net/2381/13666 http://onlinelibrary.wiley.com/doi/10.1029/2011JA017327/abstract doi:10.1029/2011JA017327 |
op_rights |
Copyright © 2012 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/10.1029/2011JA017327 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
117 |
container_issue |
A3 |
container_start_page |
n/a |
op_container_end_page |
n/a |
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1766213232687579136 |