Equatorward propagating auroral arcs driven by ULF wave activity: Multipoint ground- and space-based observations in the dusk sector auroral oval
Observations of multiple equatorward propagating arcs driven by a resonant Alfvén wave on closed field lines are presented. Data sets from the European Incoherent Scatter Svalbard Radar (ESR) and Meridian Scanning Photometer in Longyearbyen, All-Sky Camera in Ny Ålesund, ground magnetometer data in...
Published in: | Journal of Geophysical Research: Space Physics |
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Online Access: | http://nora.nerc.ac.uk/id/eprint/517342/ https://nora.nerc.ac.uk/id/eprint/517342/1/Baddeley_et_al-2017-Journal_of_Geophysical_Research__Space_Physics.pdf https://doi.org/10.1002/2016JA023427 |
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ftnerc:oai:nora.nerc.ac.uk:517342 2023-05-15T17:08:31+02:00 Equatorward propagating auroral arcs driven by ULF wave activity: Multipoint ground- and space-based observations in the dusk sector auroral oval Baddeley, Lisa J. Lorentzen, Dag Arne Partamies, N. Denig, M. Pilipenko, V. A. Oksavik, K. Chen, X. Zhang, Y. 2017-05 text http://nora.nerc.ac.uk/id/eprint/517342/ https://nora.nerc.ac.uk/id/eprint/517342/1/Baddeley_et_al-2017-Journal_of_Geophysical_Research__Space_Physics.pdf https://doi.org/10.1002/2016JA023427 en eng Wiley https://nora.nerc.ac.uk/id/eprint/517342/1/Baddeley_et_al-2017-Journal_of_Geophysical_Research__Space_Physics.pdf Baddeley, Lisa J.; Lorentzen, Dag Arne; Partamies, N.; Denig, M.; Pilipenko, V. A.; Oksavik, K.; Chen, X.; Zhang, Y. 2017 Equatorward propagating auroral arcs driven by ULF wave activity: Multipoint ground- and space-based observations in the dusk sector auroral oval. Journal of Geophysical Research: Space Physics, 122 (5). 5591-5605. https://doi.org/10.1002/2016JA023427 <https://doi.org/10.1002/2016JA023427> Publication - Article PeerReviewed 2017 ftnerc https://doi.org/10.1002/2016JA023427 2023-02-04T19:45:06Z Observations of multiple equatorward propagating arcs driven by a resonant Alfvén wave on closed field lines are presented. Data sets from the European Incoherent Scatter Svalbard Radar (ESR) and Meridian Scanning Photometer in Longyearbyen, All-Sky Camera in Ny Ålesund, ground magnetometer data in Svalbard, and Defense Meteorological Satellite Program (DMSP) F16 satellite were utilized to study the arc structures. The arcs had an equatorward phase propagation of ~0.46 km s−1 and were observed in the dusk ionosphere from 1800 to 2030 magnetic local time. Analysis of the optical data indicates that the Alfvén wave had a frequency of 1.63 mHz and an azimuthal wave number, m ~ −20 (the negative sign indicating a westward propagation). Inverted-V electron populations associated with field-aligned currents of between 0.5 and 0.8 μA m−2 are observed by DMSP F16 inside the arc structures. In addition to electron density enhancements associated with the arcs, the ESR data show elevated ion temperatures in between the arcs consistent with electric field enhancements and ionospheric heating effects. The combination of ESR and DMSP F16 data indicates that the wave energy was dissipated through ionospheric Joule and/or ion frictional heating and acceleration of particles into the ionosphere, generating the auroral displays. The fine-scale structuring, in addition to the propagation direction and scale size, would suggest that the auroral features are the signatures of a field line resonance driven by an interaction with a compressional fast mode wave propagating earthward from the magnetotail. Article in Journal/Newspaper Longyearbyen Ny Ålesund Ny-Ålesund Svalbard Natural Environment Research Council: NERC Open Research Archive Svalbard Ny-Ålesund Longyearbyen Journal of Geophysical Research: Space Physics 122 5 5591 5605 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Observations of multiple equatorward propagating arcs driven by a resonant Alfvén wave on closed field lines are presented. Data sets from the European Incoherent Scatter Svalbard Radar (ESR) and Meridian Scanning Photometer in Longyearbyen, All-Sky Camera in Ny Ålesund, ground magnetometer data in Svalbard, and Defense Meteorological Satellite Program (DMSP) F16 satellite were utilized to study the arc structures. The arcs had an equatorward phase propagation of ~0.46 km s−1 and were observed in the dusk ionosphere from 1800 to 2030 magnetic local time. Analysis of the optical data indicates that the Alfvén wave had a frequency of 1.63 mHz and an azimuthal wave number, m ~ −20 (the negative sign indicating a westward propagation). Inverted-V electron populations associated with field-aligned currents of between 0.5 and 0.8 μA m−2 are observed by DMSP F16 inside the arc structures. In addition to electron density enhancements associated with the arcs, the ESR data show elevated ion temperatures in between the arcs consistent with electric field enhancements and ionospheric heating effects. The combination of ESR and DMSP F16 data indicates that the wave energy was dissipated through ionospheric Joule and/or ion frictional heating and acceleration of particles into the ionosphere, generating the auroral displays. The fine-scale structuring, in addition to the propagation direction and scale size, would suggest that the auroral features are the signatures of a field line resonance driven by an interaction with a compressional fast mode wave propagating earthward from the magnetotail. |
format |
Article in Journal/Newspaper |
author |
Baddeley, Lisa J. Lorentzen, Dag Arne Partamies, N. Denig, M. Pilipenko, V. A. Oksavik, K. Chen, X. Zhang, Y. |
spellingShingle |
Baddeley, Lisa J. Lorentzen, Dag Arne Partamies, N. Denig, M. Pilipenko, V. A. Oksavik, K. Chen, X. Zhang, Y. Equatorward propagating auroral arcs driven by ULF wave activity: Multipoint ground- and space-based observations in the dusk sector auroral oval |
author_facet |
Baddeley, Lisa J. Lorentzen, Dag Arne Partamies, N. Denig, M. Pilipenko, V. A. Oksavik, K. Chen, X. Zhang, Y. |
author_sort |
Baddeley, Lisa J. |
title |
Equatorward propagating auroral arcs driven by ULF wave activity: Multipoint ground- and space-based observations in the dusk sector auroral oval |
title_short |
Equatorward propagating auroral arcs driven by ULF wave activity: Multipoint ground- and space-based observations in the dusk sector auroral oval |
title_full |
Equatorward propagating auroral arcs driven by ULF wave activity: Multipoint ground- and space-based observations in the dusk sector auroral oval |
title_fullStr |
Equatorward propagating auroral arcs driven by ULF wave activity: Multipoint ground- and space-based observations in the dusk sector auroral oval |
title_full_unstemmed |
Equatorward propagating auroral arcs driven by ULF wave activity: Multipoint ground- and space-based observations in the dusk sector auroral oval |
title_sort |
equatorward propagating auroral arcs driven by ulf wave activity: multipoint ground- and space-based observations in the dusk sector auroral oval |
publisher |
Wiley |
publishDate |
2017 |
url |
http://nora.nerc.ac.uk/id/eprint/517342/ https://nora.nerc.ac.uk/id/eprint/517342/1/Baddeley_et_al-2017-Journal_of_Geophysical_Research__Space_Physics.pdf https://doi.org/10.1002/2016JA023427 |
geographic |
Svalbard Ny-Ålesund Longyearbyen |
geographic_facet |
Svalbard Ny-Ålesund Longyearbyen |
genre |
Longyearbyen Ny Ålesund Ny-Ålesund Svalbard |
genre_facet |
Longyearbyen Ny Ålesund Ny-Ålesund Svalbard |
op_relation |
https://nora.nerc.ac.uk/id/eprint/517342/1/Baddeley_et_al-2017-Journal_of_Geophysical_Research__Space_Physics.pdf Baddeley, Lisa J.; Lorentzen, Dag Arne; Partamies, N.; Denig, M.; Pilipenko, V. A.; Oksavik, K.; Chen, X.; Zhang, Y. 2017 Equatorward propagating auroral arcs driven by ULF wave activity: Multipoint ground- and space-based observations in the dusk sector auroral oval. Journal of Geophysical Research: Space Physics, 122 (5). 5591-5605. https://doi.org/10.1002/2016JA023427 <https://doi.org/10.1002/2016JA023427> |
op_doi |
https://doi.org/10.1002/2016JA023427 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
122 |
container_issue |
5 |
container_start_page |
5591 |
op_container_end_page |
5605 |
_version_ |
1766064284395110400 |