Variability in the electrodynamics of the small scale Auroral arc
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 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.
auroral arc, dynamic of the non-uniform current sheet, fine scale aurora, fine scale lectic fields, statistical analysis
Krcelic, P.
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Fear, R. C.
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Whiter, D.
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Lanchester, B.
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Brindley, N.
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5 July 2024
Krcelic, P.
66a538d3-f0dc-451a-ac91-631f547e26d9
Fear, R. C.
8755b9ed-c7dc-4cbb-ac9b-56235a0431ab
Whiter, D.
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c
Lanchester, B.
e864533e-eea0-471f-a3f9-7c70c25be55b
Brindley, N.
5ee6ddec-d097-4ca3-9062-dacc47f31409
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).
Abstract
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.
Text
JGR Space Physics - 2024 - Krcelic - Variability in the Electrodynamics of the Small Scale Auroral Arc
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Accepted/In Press date: 22 June 2024
Published date: 5 July 2024
Keywords:
auroral arc, dynamic of the non-uniform current sheet, fine scale aurora, fine scale lectic fields, statistical analysis
Identifiers
Local EPrints ID: 493575
URI: http://eprints.soton.ac.uk/id/eprint/493575
ISSN: 2169-9380
PURE UUID: b0806667-d078-45f3-83f7-4ca37861c812
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Date deposited: 06 Sep 2024 16:47
Last modified: 13 Nov 2024 02:47
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Author:
P. Krcelic
Author:
B. Lanchester
Author:
N. Brindley
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