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Multi-scale observation of two polar cap arcs occurring on different magnetic field topologies

Multi-scale observation of two polar cap arcs occurring on different magnetic field topologies
Multi-scale 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 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.
2169-9380
1-17
Reidy, Jade
7dbc1f34-be44-4269-a3f4-9f490aaaadc7
Fear, Robert
8755b9ed-c7dc-4cbb-ac9b-56235a0431ab
Whiter, Daniel
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c
Lanchester, Betty
e864533e-eea0-471f-a3f9-7c70c25be55b
Kavanagh, Andrew
08817d36-54a2-4f98-a553-a410c38aae28
Price, David John
95c63aa4-5db1-4a35-8743-5acbced1a156
Chadney, Joshua M
4209e45f-6092-4c9d-b46b-4b598269a0f3
Zhang, Y
8755db41-7719-4e56-9d07-3dd78e648644
Paxton, Larry
74fc06ff-6a71-4291-9fd0-33821ce5d27b
Reidy, Jade
7dbc1f34-be44-4269-a3f4-9f490aaaadc7
Fear, Robert
8755b9ed-c7dc-4cbb-ac9b-56235a0431ab
Whiter, Daniel
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c
Lanchester, Betty
e864533e-eea0-471f-a3f9-7c70c25be55b
Kavanagh, Andrew
08817d36-54a2-4f98-a553-a410c38aae28
Price, David John
95c63aa4-5db1-4a35-8743-5acbced1a156
Chadney, Joshua M
4209e45f-6092-4c9d-b46b-4b598269a0f3
Zhang, Y
8755db41-7719-4e56-9d07-3dd78e648644
Paxton, Larry
74fc06ff-6a71-4291-9fd0-33821ce5d27b

Reidy, Jade, Fear, Robert, Whiter, Daniel, Lanchester, Betty, Kavanagh, Andrew, Price, David John, Chadney, Joshua M, Zhang, Y and Paxton, Larry (2020) Multi-scale observation of two polar cap arcs occurring on different magnetic field topologies. Journal of Geophysical Research: Space Physics, 1-17. (doi:10.1029/2019JA027611).

Record type: Article

Abstract

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.

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Multi_scale_PCA_second_revision - Accepted Manuscript
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More information

Accepted/In Press date: 4 June 2020
e-pub ahead of print date: 20 July 2020

Identifiers

Local EPrints ID: 442292
URI: http://eprints.soton.ac.uk/id/eprint/442292
ISSN: 2169-9380
PURE UUID: 291d304a-cb31-45ba-8fd6-90ac1e30cf1e
ORCID for Robert Fear: ORCID iD orcid.org/0000-0003-0589-7147
ORCID for Daniel Whiter: ORCID iD orcid.org/0000-0001-7130-232X
ORCID for Joshua M Chadney: ORCID iD orcid.org/0000-0002-5174-2114

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Date deposited: 10 Jul 2020 16:41
Last modified: 18 Feb 2021 17:23

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