Timescales of Dayside and Nightside Field-Aligned Current Response to Changes in Solar Wind-Magnetosphere Coupling
Principal component analysis is performed on Birkeland or field-aligned current (FAC) measurements from the Active Magnetosphere and Planetary Electrodynamics Response Experiment, to determine the response of dayside and nightside FACs to reversals in the orientation of the interplanetary magnetic f...
Published in: | Journal of Geophysical Research: Space Physics |
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Main Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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American Geophysical Union (AGU), Wiley
2019
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Subjects: | |
Online Access: | https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JA025645 http://hdl.handle.net/2381/44762 https://doi.org/10.1029/2018JA025645 |
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ftleicester:oai:lra.le.ac.uk:2381/44762 |
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Open Polar |
collection |
University of Leicester: Leicester Research Archive (LRA) |
op_collection_id |
ftleicester |
language |
English |
topic |
Science & Technology Physical Sciences Astronomy & Astrophysics magnetosphere ionosphere currents INTERPLANETARY MAGNETIC-FIELD IMF B-Y BIRKELAND CURRENTS IONOSPHERIC CONVECTION EARTHS MAGNETOTAIL MAGNETOMETER DATA NORTHWARD SUBSTORMS INTERVALS SYSTEM |
spellingShingle |
Science & Technology Physical Sciences Astronomy & Astrophysics magnetosphere ionosphere currents INTERPLANETARY MAGNETIC-FIELD IMF B-Y BIRKELAND CURRENTS IONOSPHERIC CONVECTION EARTHS MAGNETOTAIL MAGNETOMETER DATA NORTHWARD SUBSTORMS INTERVALS SYSTEM Milan, SE Carter, JA Sangha, H Laundal, KM Ostgaard, N Tenfjord, P Reistad, JP Snekvik, K Coxon, JC Korth, H Anderson, BJ Timescales of Dayside and Nightside Field-Aligned Current Response to Changes in Solar Wind-Magnetosphere Coupling |
topic_facet |
Science & Technology Physical Sciences Astronomy & Astrophysics magnetosphere ionosphere currents INTERPLANETARY MAGNETIC-FIELD IMF B-Y BIRKELAND CURRENTS IONOSPHERIC CONVECTION EARTHS MAGNETOTAIL MAGNETOMETER DATA NORTHWARD SUBSTORMS INTERVALS SYSTEM |
description |
Principal component analysis is performed on Birkeland or field-aligned current (FAC) measurements from the Active Magnetosphere and Planetary Electrodynamics Response Experiment, to determine the response of dayside and nightside FACs to reversals in the orientation of the interplanetary magnetic field (IMF) and the occurrence of substorms. Dayside FACs respond promptly to changes in IMF BY , but the nightside response is delayed by up to an hour and can take up to 4 hr to develop fully, especially during northward IMF. Nightside FAC asymmetries grow during substorm growth phase when the IMF has a significant BY component, and also promptly at substorm onset. Our findings suggest that magnetotail twisting and/or BY penetration into the magnetotail, due to subsolar reconnection with east-west orientated IMF, are the main cause of these nightside FAC asymmetries and that asymmetries also arise due to magnetotail reconnection of these twisted field lines. S. E. M. and J. A. C. were supported by the Science and Technology Facilities Council (STFC), UK, grant ST/N000749/1; H. S. was supported by a STFC studentship. The work at the Birkeland Centre for Space Centre, University of Bergen, Norway, was supported by the Research Council of Norway/CoE under contract 223252/F50. We thank the AMPERE team and the AMPERE Science Center for providing the Iridium‐derived data products; AMPERE products are available at http://ampere.jhuapl.edu. The OMNI data, including solar wind parameters and geomagnetic indices, were obtained from the GSFC/SPDF OMNIWeb interface at http://omniweb.gsfc.nasa.gov. The SuperMAG substorm list was downloaded from http://supermag.jhuapl.edu. For the ground magnetometer data from which this list was derived, we gratefully acknowledge the following: Intermagnet; USGS, Jeffrey J. Love; CARISMA, PI Ian Mann; CANMOS; The S‐RAMP Database, PI K. Yumoto and K. Shiokawa; The SPIDR database; AARI, PI Oleg Troshichev; The MACCS program, PI M. Engebretson, Geomagnetism Unit of the Geological Survey of Canada; GIMA; MEASURE, UCLA IGPP and Florida Institute of Technology; SAMBA, PI Eftyhia Zesta; 210 Chain, PI K. Yumoto; SAMNET, PI Farideh Honary; the institutes who maintain the IMAGE magnetometer array, PI Eija Tanskanen; PENGUIN; AUTUMN, PI Martin Connors; DTU Space, PI Juergen Matzka; South Pole and McMurdo Magnetometer, PIs Louis J. Lanzarotti and Alan T. Weatherwax; ICESTAR; RAPIDMAG; PENGUIn; British Artarctic Survey; McMac, PI Peter Chi; BGS, PI Susan Macmillan; Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN); GFZ, PI Juergen Matzka; MFGI, PI B. Heilig; IGFPAS, PI J. Reda; University of L'Aquila, PI M. Vellante; SuperMAG, PI Jesper W. Gjerloev. Peer-reviewed Publisher Version |
format |
Article in Journal/Newspaper |
author |
Milan, SE Carter, JA Sangha, H Laundal, KM Ostgaard, N Tenfjord, P Reistad, JP Snekvik, K Coxon, JC Korth, H Anderson, BJ |
author_facet |
Milan, SE Carter, JA Sangha, H Laundal, KM Ostgaard, N Tenfjord, P Reistad, JP Snekvik, K Coxon, JC Korth, H Anderson, BJ |
author_sort |
Milan, SE |
title |
Timescales of Dayside and Nightside Field-Aligned Current Response to Changes in Solar Wind-Magnetosphere Coupling |
title_short |
Timescales of Dayside and Nightside Field-Aligned Current Response to Changes in Solar Wind-Magnetosphere Coupling |
title_full |
Timescales of Dayside and Nightside Field-Aligned Current Response to Changes in Solar Wind-Magnetosphere Coupling |
title_fullStr |
Timescales of Dayside and Nightside Field-Aligned Current Response to Changes in Solar Wind-Magnetosphere Coupling |
title_full_unstemmed |
Timescales of Dayside and Nightside Field-Aligned Current Response to Changes in Solar Wind-Magnetosphere Coupling |
title_sort |
timescales of dayside and nightside field-aligned current response to changes in solar wind-magnetosphere coupling |
publisher |
American Geophysical Union (AGU), Wiley |
publishDate |
2019 |
url |
https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JA025645 http://hdl.handle.net/2381/44762 https://doi.org/10.1029/2018JA025645 |
long_lat |
ENVELOPE(16.587,16.587,68.594,68.594) ENVELOPE(144.232,144.232,59.863,59.863) |
geographic |
Canada Norway South Pole Bergen Birkeland Omni |
geographic_facet |
Canada Norway South Pole Bergen Birkeland Omni |
genre |
South pole |
genre_facet |
South pole |
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http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000448376600012&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8c4e325952a993be76947405d4bce7d5 Journal of Geophysical Research: Space Physics, 2018, 123 (9), pp. 7307-7319 (13) 2169-9380 https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JA025645 http://hdl.handle.net/2381/44762 doi:10.1029/2018JA025645 2169-9402 |
op_rights |
Copyright © the authors, 2018. This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
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op_doi |
https://doi.org/10.1029/2018JA025645 |
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Journal of Geophysical Research: Space Physics |
container_volume |
123 |
container_issue |
9 |
container_start_page |
7307 |
op_container_end_page |
7319 |
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spelling |
ftleicester:oai:lra.le.ac.uk:2381/44762 2023-05-15T18:23:24+02:00 Timescales of Dayside and Nightside Field-Aligned Current Response to Changes in Solar Wind-Magnetosphere Coupling Milan, SE Carter, JA Sangha, H Laundal, KM Ostgaard, N Tenfjord, P Reistad, JP Snekvik, K Coxon, JC Korth, H Anderson, BJ 2019-07-09T11:52:04Z https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JA025645 http://hdl.handle.net/2381/44762 https://doi.org/10.1029/2018JA025645 en eng American Geophysical Union (AGU), Wiley http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000448376600012&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8c4e325952a993be76947405d4bce7d5 Journal of Geophysical Research: Space Physics, 2018, 123 (9), pp. 7307-7319 (13) 2169-9380 https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018JA025645 http://hdl.handle.net/2381/44762 doi:10.1029/2018JA025645 2169-9402 Copyright © the authors, 2018. This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. CC-BY Science & Technology Physical Sciences Astronomy & Astrophysics magnetosphere ionosphere currents INTERPLANETARY MAGNETIC-FIELD IMF B-Y BIRKELAND CURRENTS IONOSPHERIC CONVECTION EARTHS MAGNETOTAIL MAGNETOMETER DATA NORTHWARD SUBSTORMS INTERVALS SYSTEM Journal Article Article;Journal 2019 ftleicester https://doi.org/10.1029/2018JA025645 2019-07-11T22:44:58Z Principal component analysis is performed on Birkeland or field-aligned current (FAC) measurements from the Active Magnetosphere and Planetary Electrodynamics Response Experiment, to determine the response of dayside and nightside FACs to reversals in the orientation of the interplanetary magnetic field (IMF) and the occurrence of substorms. Dayside FACs respond promptly to changes in IMF BY , but the nightside response is delayed by up to an hour and can take up to 4 hr to develop fully, especially during northward IMF. Nightside FAC asymmetries grow during substorm growth phase when the IMF has a significant BY component, and also promptly at substorm onset. Our findings suggest that magnetotail twisting and/or BY penetration into the magnetotail, due to subsolar reconnection with east-west orientated IMF, are the main cause of these nightside FAC asymmetries and that asymmetries also arise due to magnetotail reconnection of these twisted field lines. S. E. M. and J. A. C. were supported by the Science and Technology Facilities Council (STFC), UK, grant ST/N000749/1; H. S. was supported by a STFC studentship. The work at the Birkeland Centre for Space Centre, University of Bergen, Norway, was supported by the Research Council of Norway/CoE under contract 223252/F50. We thank the AMPERE team and the AMPERE Science Center for providing the Iridium‐derived data products; AMPERE products are available at http://ampere.jhuapl.edu. The OMNI data, including solar wind parameters and geomagnetic indices, were obtained from the GSFC/SPDF OMNIWeb interface at http://omniweb.gsfc.nasa.gov. The SuperMAG substorm list was downloaded from http://supermag.jhuapl.edu. For the ground magnetometer data from which this list was derived, we gratefully acknowledge the following: Intermagnet; USGS, Jeffrey J. Love; CARISMA, PI Ian Mann; CANMOS; The S‐RAMP Database, PI K. Yumoto and K. Shiokawa; The SPIDR database; AARI, PI Oleg Troshichev; The MACCS program, PI M. Engebretson, Geomagnetism Unit of the Geological Survey of Canada; GIMA; MEASURE, UCLA IGPP and Florida Institute of Technology; SAMBA, PI Eftyhia Zesta; 210 Chain, PI K. Yumoto; SAMNET, PI Farideh Honary; the institutes who maintain the IMAGE magnetometer array, PI Eija Tanskanen; PENGUIN; AUTUMN, PI Martin Connors; DTU Space, PI Juergen Matzka; South Pole and McMurdo Magnetometer, PIs Louis J. Lanzarotti and Alan T. Weatherwax; ICESTAR; RAPIDMAG; PENGUIn; British Artarctic Survey; McMac, PI Peter Chi; BGS, PI Susan Macmillan; Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN); GFZ, PI Juergen Matzka; MFGI, PI B. Heilig; IGFPAS, PI J. Reda; University of L'Aquila, PI M. Vellante; SuperMAG, PI Jesper W. Gjerloev. Peer-reviewed Publisher Version Article in Journal/Newspaper South pole University of Leicester: Leicester Research Archive (LRA) Canada Norway South Pole Bergen Birkeland ENVELOPE(16.587,16.587,68.594,68.594) Omni ENVELOPE(144.232,144.232,59.863,59.863) Journal of Geophysical Research: Space Physics 123 9 7307 7319 |