Comparison between SuperDARN flow vectors and equivalent ionospheric currents from ground magnetometer arrays
[1] Equivalent ionospheric currents obtained with the spherical elementary current systems (SECS) method and derived from nearly 100 ground magnetometers spread over North America and Greenland are compared with ionospheric flow vectors measured by the SuperDARN radars during both the summer and win...
Published in: | Journal of Geophysical Research: Space Physics |
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American Geophysical Union (AGU); Wiley
2012
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Online Access: | http://hdl.handle.net/2381/13381 http://onlinelibrary.wiley.com/doi/10.1029/2011JA017407/abstract https://doi.org/10.1029/2011JA017407 |
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ftleicester:oai:lra.le.ac.uk:2381/13381 2023-05-15T16:29:38+02:00 Comparison between SuperDARN flow vectors and equivalent ionospheric currents from ground magnetometer arrays Weygand, J. M. Amm, O. Angelopoulos, V. Milan, S. E. Grocott, A. Gleisner, H. Stolle, C. 2012-10-24T08:56:42Z http://hdl.handle.net/2381/13381 http://onlinelibrary.wiley.com/doi/10.1029/2011JA017407/abstract https://doi.org/10.1029/2011JA017407 unknown American Geophysical Union (AGU); Wiley Journal of Geophysical Research A: SPACE PHYSICS, 2012, 117 (5) 0148-0227 http://hdl.handle.net/2381/13381 http://onlinelibrary.wiley.com/doi/10.1029/2011JA017407/abstract doi:10.1029/2011JA017407 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/10.1029/2011JA017407 2019-03-22T20:15:27Z [1] Equivalent ionospheric currents obtained with the spherical elementary current systems (SECS) method and derived from nearly 100 ground magnetometers spread over North America and Greenland are compared with ionospheric flow vectors measured by the SuperDARN radars during both the summer and winter seasons. This comparison is done over a range of spatial separations, magnetic latitudes, magnetic local times, and auroral electrojet activity to investigate under what conditions the vectors are anti-parallel to one another. Our results show that in general the equivalent ionospheric currents are anti-parallel to the flows and the best results are achieved within the auroral oval during active geomagnetic conditions in the dawn, dusk and noon sectors in the northern hemisphere summer. These results indicate the best anti-parallel alignment occurs when the currents and flows are large and well defined. Factors that may influence the alignment include ionospheric conductivity gradients and quiet time backgrounds. Our results can be used to approximate the macroscopic (∼1000 km) ionospheric convection patterns. The SECS maps represent a value-added product from the raw magnetometer database and can be used for contextual interpretation; they can help with our understanding of magnetosphere-ionosphere coupling mechanisms using ground arrays and the magnetospheric spacecraft data, and they can be used as input for other techniques. Peer-reviewed Publisher Version 117397 Article in Journal/Newspaper Greenland University of Leicester: Leicester Research Archive (LRA) Greenland Journal of Geophysical Research: Space Physics 117 A5 n/a n/a |
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Open Polar |
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University of Leicester: Leicester Research Archive (LRA) |
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ftleicester |
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unknown |
description |
[1] Equivalent ionospheric currents obtained with the spherical elementary current systems (SECS) method and derived from nearly 100 ground magnetometers spread over North America and Greenland are compared with ionospheric flow vectors measured by the SuperDARN radars during both the summer and winter seasons. This comparison is done over a range of spatial separations, magnetic latitudes, magnetic local times, and auroral electrojet activity to investigate under what conditions the vectors are anti-parallel to one another. Our results show that in general the equivalent ionospheric currents are anti-parallel to the flows and the best results are achieved within the auroral oval during active geomagnetic conditions in the dawn, dusk and noon sectors in the northern hemisphere summer. These results indicate the best anti-parallel alignment occurs when the currents and flows are large and well defined. Factors that may influence the alignment include ionospheric conductivity gradients and quiet time backgrounds. Our results can be used to approximate the macroscopic (∼1000 km) ionospheric convection patterns. The SECS maps represent a value-added product from the raw magnetometer database and can be used for contextual interpretation; they can help with our understanding of magnetosphere-ionosphere coupling mechanisms using ground arrays and the magnetospheric spacecraft data, and they can be used as input for other techniques. Peer-reviewed Publisher Version 117397 |
format |
Article in Journal/Newspaper |
author |
Weygand, J. M. Amm, O. Angelopoulos, V. Milan, S. E. Grocott, A. Gleisner, H. Stolle, C. |
spellingShingle |
Weygand, J. M. Amm, O. Angelopoulos, V. Milan, S. E. Grocott, A. Gleisner, H. Stolle, C. Comparison between SuperDARN flow vectors and equivalent ionospheric currents from ground magnetometer arrays |
author_facet |
Weygand, J. M. Amm, O. Angelopoulos, V. Milan, S. E. Grocott, A. Gleisner, H. Stolle, C. |
author_sort |
Weygand, J. M. |
title |
Comparison between SuperDARN flow vectors and equivalent ionospheric currents from ground magnetometer arrays |
title_short |
Comparison between SuperDARN flow vectors and equivalent ionospheric currents from ground magnetometer arrays |
title_full |
Comparison between SuperDARN flow vectors and equivalent ionospheric currents from ground magnetometer arrays |
title_fullStr |
Comparison between SuperDARN flow vectors and equivalent ionospheric currents from ground magnetometer arrays |
title_full_unstemmed |
Comparison between SuperDARN flow vectors and equivalent ionospheric currents from ground magnetometer arrays |
title_sort |
comparison between superdarn flow vectors and equivalent ionospheric currents from ground magnetometer arrays |
publisher |
American Geophysical Union (AGU); Wiley |
publishDate |
2012 |
url |
http://hdl.handle.net/2381/13381 http://onlinelibrary.wiley.com/doi/10.1029/2011JA017407/abstract https://doi.org/10.1029/2011JA017407 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Scopus http://www.scopus.com/home.url |
op_relation |
Journal of Geophysical Research A: SPACE PHYSICS, 2012, 117 (5) 0148-0227 http://hdl.handle.net/2381/13381 http://onlinelibrary.wiley.com/doi/10.1029/2011JA017407/abstract doi:10.1029/2011JA017407 |
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/10.1029/2011JA017407 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
117 |
container_issue |
A5 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766019347607715840 |