Variability in the electrodynamics of the small scale Auroral arc
A statistical study has been made of dynamic small-scale auroral events in order to understand the drivers of the large variability in the electrodynamics of auroral arcs at fine scales. We used the Auroral Structure and Kinetics (ASK) instrument, located on Svalbard, in order to measure various ele...
Published in: | Journal of Geophysical Research: Space Physics |
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ftsouthampton:oai:eprints.soton.ac.uk:493575 2024-09-30T14:44:39+00:00 Variability in the electrodynamics of the small scale Auroral arc Krcelic, P. Fear, R.C. Whiter, D. Lanchester, B. Brindley, N. 2024-07-05 text https://eprints.soton.ac.uk/493575/ https://eprints.soton.ac.uk/493575/1/JGR_Space_Physics_-_2024_-_Krcelic_-_Variability_in_the_Electrodynamics_of_the_Small_Scale_Auroral_Arc.pdf en English eng https://eprints.soton.ac.uk/493575/1/JGR_Space_Physics_-_2024_-_Krcelic_-_Variability_in_the_Electrodynamics_of_the_Small_Scale_Auroral_Arc.pdf Krcelic, P., Fear, R.C., Whiter, D., Lanchester, B. and Brindley, N. (2024) Variability in the electrodynamics of the small scale Auroral arc. Journal of Geophysical Research: Space Physics, 129 (7), [e2024JA032623]. (doi:10.1029/2024JA032623 <http://dx.doi.org/10.1029/2024JA032623>). cc_by_4 Article PeerReviewed 2024 ftsouthampton https://doi.org/10.1029/2024JA032623 2024-09-11T14:18:14Z A statistical study has been made of dynamic small-scale auroral events in order to understand the drivers of the large variability in the electrodynamics of auroral arcs at fine scales. We used the Auroral Structure and Kinetics (ASK) instrument, located on Svalbard, in order to measure various electrodynamic properties of fine scale auroral arcs. We performed Spearman and Kendall statistical tests and found two significant correlations. The first is between the mean precipitation flux and the variability of flux, which we assume is because of the dynamic and bursty nature of the acceleration mechanism and its dependence on Alfvén waves. The second correlation is between the variability of the precipitating electron flux and the variability of the tangential component of the electric field close to the arc and perpendicular to the magnetic field. We propose that both variabilities occur because of the variability of the upward (field-aligned) current sheet in and around the arc, which is dynamic and non-uniform. The correlation between the two variabilities can therefore be explained by their common source. Article in Journal/Newspaper Svalbard University of Southampton: e-Prints Soton Svalbard Kendall ENVELOPE(-59.828,-59.828,-63.497,-63.497) Journal of Geophysical Research: Space Physics 129 7 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
description |
A statistical study has been made of dynamic small-scale auroral events in order to understand the drivers of the large variability in the electrodynamics of auroral arcs at fine scales. We used the Auroral Structure and Kinetics (ASK) instrument, located on Svalbard, in order to measure various electrodynamic properties of fine scale auroral arcs. We performed Spearman and Kendall statistical tests and found two significant correlations. The first is between the mean precipitation flux and the variability of flux, which we assume is because of the dynamic and bursty nature of the acceleration mechanism and its dependence on Alfvén waves. The second correlation is between the variability of the precipitating electron flux and the variability of the tangential component of the electric field close to the arc and perpendicular to the magnetic field. We propose that both variabilities occur because of the variability of the upward (field-aligned) current sheet in and around the arc, which is dynamic and non-uniform. The correlation between the two variabilities can therefore be explained by their common source. |
format |
Article in Journal/Newspaper |
author |
Krcelic, P. Fear, R.C. Whiter, D. Lanchester, B. Brindley, N. |
spellingShingle |
Krcelic, P. Fear, R.C. Whiter, D. Lanchester, B. Brindley, N. Variability in the electrodynamics of the small scale Auroral arc |
author_facet |
Krcelic, P. Fear, R.C. Whiter, D. Lanchester, B. Brindley, N. |
author_sort |
Krcelic, P. |
title |
Variability in the electrodynamics of the small scale Auroral arc |
title_short |
Variability in the electrodynamics of the small scale Auroral arc |
title_full |
Variability in the electrodynamics of the small scale Auroral arc |
title_fullStr |
Variability in the electrodynamics of the small scale Auroral arc |
title_full_unstemmed |
Variability in the electrodynamics of the small scale Auroral arc |
title_sort |
variability in the electrodynamics of the small scale auroral arc |
publishDate |
2024 |
url |
https://eprints.soton.ac.uk/493575/ https://eprints.soton.ac.uk/493575/1/JGR_Space_Physics_-_2024_-_Krcelic_-_Variability_in_the_Electrodynamics_of_the_Small_Scale_Auroral_Arc.pdf |
long_lat |
ENVELOPE(-59.828,-59.828,-63.497,-63.497) |
geographic |
Svalbard Kendall |
geographic_facet |
Svalbard Kendall |
genre |
Svalbard |
genre_facet |
Svalbard |
op_relation |
https://eprints.soton.ac.uk/493575/1/JGR_Space_Physics_-_2024_-_Krcelic_-_Variability_in_the_Electrodynamics_of_the_Small_Scale_Auroral_Arc.pdf Krcelic, P., Fear, R.C., Whiter, D., Lanchester, B. and Brindley, N. (2024) Variability in the electrodynamics of the small scale Auroral arc. Journal of Geophysical Research: Space Physics, 129 (7), [e2024JA032623]. (doi:10.1029/2024JA032623 <http://dx.doi.org/10.1029/2024JA032623>). |
op_rights |
cc_by_4 |
op_doi |
https://doi.org/10.1029/2024JA032623 |
container_title |
Journal of Geophysical Research: Space Physics |
container_volume |
129 |
container_issue |
7 |
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1811645799412531200 |