Multiscale observation of two polar cap arcs occurring on different magnetic field topologies
This paper presents observations of polar cap arc substructure down to scale sizes of meters and temporal resolution of milliseconds. Two case studies containing polar cap arcs occurring over Svalbard are investigated. The first occurred on 4 February 2016 and is consistent with formation on closed...
Published in: | Journal of Geophysical Research: Space Physics |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
2020
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/528344/ https://nora.nerc.ac.uk/id/eprint/528344/1/2019JA027611.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019JA027611 |
id |
ftnerc:oai:nora.nerc.ac.uk:528344 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:528344 2024-02-11T10:09:01+01:00 Multiscale observation of two polar cap arcs occurring on different magnetic field topologies Reidy, J.A. Fear, R.C. Whiter, D.K. Lanchester, B.S. Kavanagh, A.J. Price, D.J. Chadney, J.M. Zhang, Y. Paxton, L.J. 2020-08-01 text http://nora.nerc.ac.uk/id/eprint/528344/ https://nora.nerc.ac.uk/id/eprint/528344/1/2019JA027611.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019JA027611 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/528344/1/2019JA027611.pdf Reidy, J.A. orcid:0000-0002-7939-991X Fear, R.C.; Whiter, D.K.; Lanchester, B.S.; Kavanagh, A.J. orcid:0000-0001-7360-7039 Price, D.J.; Chadney, J.M.; Zhang, Y.; Paxton, L.J. 2020 Multiscale observation of two polar cap arcs occurring on different magnetic field topologies. Journal of Geophysical Research: Space Physics, 125 (8), e2019JA027611. 17, pp. https://doi.org/10.1029/2019JA027611 <https://doi.org/10.1029/2019JA027611> cc_by_4 Publication - Article PeerReviewed 2020 ftnerc https://doi.org/10.1029/2019JA027611 2024-01-19T00:03:17Z This paper presents observations of polar cap arc substructure down to scale sizes of meters and temporal resolution of milliseconds. Two case studies containing polar cap arcs occurring over Svalbard are investigated. The first occurred on 4 February 2016 and is consistent with formation on closed field lines; the second occurred on 15 December 2015 and is consistent with formation on open field lines. These events were identified using global‐scale images from the Special Sensor Ultra‐violet Spectrographic Imager (SSUSI) instruments on board Defense Meteorological Satellite Program (DMSP) spacecraft. Intervals when the arcs passed through the small‐scale field of view of the Auroral Structure and Kinetics (ASK) instrument, located on Svalbard, were then found using all sky images from a camera also located on Svalbard. These observations give unprecedented insight into small‐scale polar cap arc structure. The energy and flux of the precipitating particles above these arcs are estimated using the ASK observations in conjunction with the Southampton Ionospheric model. These estimates are then compared to in situ DMSP particle measurements, as well as data from ground‐based instrumentation, to infer further information about their formation mechanisms. This paper finds that polar cap arcs formed on different magnetic field topologies exhibit different behavior at small‐scale sizes, consistent with their respective formation mechanisms. Article in Journal/Newspaper Svalbard Natural Environment Research Council: NERC Open Research Archive Svalbard Journal of Geophysical Research: Space Physics 125 8 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
This paper presents observations of polar cap arc substructure down to scale sizes of meters and temporal resolution of milliseconds. Two case studies containing polar cap arcs occurring over Svalbard are investigated. The first occurred on 4 February 2016 and is consistent with formation on closed field lines; the second occurred on 15 December 2015 and is consistent with formation on open field lines. These events were identified using global‐scale images from the Special Sensor Ultra‐violet Spectrographic Imager (SSUSI) instruments on board Defense Meteorological Satellite Program (DMSP) spacecraft. Intervals when the arcs passed through the small‐scale field of view of the Auroral Structure and Kinetics (ASK) instrument, located on Svalbard, were then found using all sky images from a camera also located on Svalbard. These observations give unprecedented insight into small‐scale polar cap arc structure. The energy and flux of the precipitating particles above these arcs are estimated using the ASK observations in conjunction with the Southampton Ionospheric model. These estimates are then compared to in situ DMSP particle measurements, as well as data from ground‐based instrumentation, to infer further information about their formation mechanisms. This paper finds that polar cap arcs formed on different magnetic field topologies exhibit different behavior at small‐scale sizes, consistent with their respective formation mechanisms. |
format |
Article in Journal/Newspaper |
author |
Reidy, J.A. Fear, R.C. Whiter, D.K. Lanchester, B.S. Kavanagh, A.J. Price, D.J. Chadney, J.M. Zhang, Y. Paxton, L.J. |
spellingShingle |
Reidy, J.A. Fear, R.C. Whiter, D.K. Lanchester, B.S. Kavanagh, A.J. Price, D.J. Chadney, J.M. Zhang, Y. Paxton, L.J. Multiscale observation of two polar cap arcs occurring on different magnetic field topologies |
author_facet |
Reidy, J.A. Fear, R.C. Whiter, D.K. Lanchester, B.S. Kavanagh, A.J. Price, D.J. Chadney, J.M. Zhang, Y. Paxton, L.J. |
author_sort |
Reidy, J.A. |
title |
Multiscale observation of two polar cap arcs occurring on different magnetic field topologies |
title_short |
Multiscale observation of two polar cap arcs occurring on different magnetic field topologies |
title_full |
Multiscale observation of two polar cap arcs occurring on different magnetic field topologies |
title_fullStr |
Multiscale observation of two polar cap arcs occurring on different magnetic field topologies |
title_full_unstemmed |
Multiscale observation of two polar cap arcs occurring on different magnetic field topologies |
title_sort |
multiscale observation of two polar cap arcs occurring on different magnetic field topologies |
publisher |
American Geophysical Union |
publishDate |
2020 |
url |
http://nora.nerc.ac.uk/id/eprint/528344/ https://nora.nerc.ac.uk/id/eprint/528344/1/2019JA027611.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019JA027611 |
geographic |
Svalbard |
geographic_facet |
Svalbard |
genre |
Svalbard |
genre_facet |
Svalbard |
op_relation |
https://nora.nerc.ac.uk/id/eprint/528344/1/2019JA027611.pdf Reidy, J.A. orcid:0000-0002-7939-991X Fear, R.C.; Whiter, D.K.; Lanchester, B.S.; Kavanagh, A.J. orcid:0000-0001-7360-7039 Price, D.J.; Chadney, J.M.; Zhang, Y.; Paxton, L.J. 2020 Multiscale observation of two polar cap arcs occurring on different magnetic field topologies. Journal of Geophysical Research: Space Physics, 125 (8), e2019JA027611. 17, pp. https://doi.org/10.1029/2019JA027611 <https://doi.org/10.1029/2019JA027611> |
op_rights |
cc_by_4 |
op_doi |
https://doi.org/10.1029/2019JA027611 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
125 |
container_issue |
8 |
_version_ |
1790608733396533248 |