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Simultaneous observations of small multi-scale structures in an auroral arc

Simultaneous observations of small multi-scale structures in an auroral arc
Simultaneous observations of small multi-scale structures in an auroral arc
Auroral arcs can develop small-scale distortions known as vortex streets or curls. Other common and somewhat larger spatially periodic distortions are auroral folds. In this event study we present simultaneous wide and narrow field imager observations of a third kind of structuring, on even smaller spatial scales.

Boundary undulations, or “ruffs”, have been observed to form on the edge of an auroral arc and they occur superimposed on curls, folds or at times of auroral shear. The undulations typically have wavelengths of less than 3 km and amplitudes of less than 800 m. They are observed to move on the edge of the arc, with velocities of about 11 km/s. These observations, with multi-scale deformations, reveal a much more intricate structuring of auroral arcs than previously found.

auroral fine structure, auroral curls and folds, instruments and techniques, plasma instabilities
1364-6826
633-637
Dahlgren, H.
8d021086-b328-46fd-affd-a7c8d2b4687e
Aikio, A.
74bb5cc8-5b2c-4498-bd41-6f31035099cc
Kaila, K.
e48b9182-9d9a-455f-9249-5691b772bf14
Ivchenko, N.
c892df9e-e2a0-450f-bf77-2673e029f565
Lanchester, B.S.
e864533e-eea0-471f-a3f9-7c70c25be55b
Whiter, D.K.
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c
Marklund, G.T.
7f664a4d-50ff-49a0-ab21-72caa766f5db
Dahlgren, H.
8d021086-b328-46fd-affd-a7c8d2b4687e
Aikio, A.
74bb5cc8-5b2c-4498-bd41-6f31035099cc
Kaila, K.
e48b9182-9d9a-455f-9249-5691b772bf14
Ivchenko, N.
c892df9e-e2a0-450f-bf77-2673e029f565
Lanchester, B.S.
e864533e-eea0-471f-a3f9-7c70c25be55b
Whiter, D.K.
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c
Marklund, G.T.
7f664a4d-50ff-49a0-ab21-72caa766f5db

Dahlgren, H., Aikio, A., Kaila, K., Ivchenko, N., Lanchester, B.S., Whiter, D.K. and Marklund, G.T. (2010) Simultaneous observations of small multi-scale structures in an auroral arc. Journal of Atmospheric and Solar-Terrestrial Physics, 72 (7-8), 633-637. (doi:10.1016/j.jastp.2010.01.014).

Record type: Article

Abstract

Auroral arcs can develop small-scale distortions known as vortex streets or curls. Other common and somewhat larger spatially periodic distortions are auroral folds. In this event study we present simultaneous wide and narrow field imager observations of a third kind of structuring, on even smaller spatial scales.

Boundary undulations, or “ruffs”, have been observed to form on the edge of an auroral arc and they occur superimposed on curls, folds or at times of auroral shear. The undulations typically have wavelengths of less than 3 km and amplitudes of less than 800 m. They are observed to move on the edge of the arc, with velocities of about 11 km/s. These observations, with multi-scale deformations, reveal a much more intricate structuring of auroral arcs than previously found.

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More information

Published date: May 2010
Keywords: auroral fine structure, auroral curls and folds, instruments and techniques, plasma instabilities
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 148229
URI: http://eprints.soton.ac.uk/id/eprint/148229
ISSN: 1364-6826
PURE UUID: 09a1e8ea-5404-4960-ad03-5b5569a5e83e
ORCID for D.K. Whiter: ORCID iD orcid.org/0000-0001-7130-232X

Catalogue record

Date deposited: 27 Apr 2010 13:32
Last modified: 17 Sep 2019 00:47

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