The University of Southampton
University of Southampton Institutional Repository

Using multispectral optical observations to identify the acceleration mechanism responsible for flickering aurora

Using multispectral optical observations to identify the acceleration mechanism responsible for flickering aurora
Using multispectral optical observations to identify the acceleration mechanism responsible for flickering aurora
We present an analysis of flickering (2–10 Hz) auroras observed with a state-of-the-art multispectral imaging system, Auroral Structure and Kinetics, located in Tromsø, Norway. Short (1–2 s) periods of flickering aurora have been identified in which the frequency of the brightness oscillations decreases or increases smoothly over time. To the authors' knowledge this is the first detailed analysis of such “chirps” in flickering aurora or field-aligned bursts. We have found that the electron precipitation energy is strongly anticorrelated with the flickering frequency during all identified chirps. This result is consistent with the theory that flickering aurora is caused by the resonance interaction between electromagnetic ion cyclotron waves and precipitating electrons and that the wave parallel phase velocity is the primary factor determining the electron acceleration produced by this mechanism. Other current theories known to the authors cannot completely explain our observations.

0148-0227
A12315
Whiter, D.K.
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c
Lanchester, B.S.
e864533e-eea0-471f-a3f9-7c70c25be55b
Gustavsson, B.
5ef90805-5748-4626-a3b6-85554fac934d
Ivchenko, N.
c892df9e-e2a0-450f-bf77-2673e029f565
Dahlgren, H.
8d021086-b328-46fd-affd-a7c8d2b4687e
Whiter, D.K.
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c
Lanchester, B.S.
e864533e-eea0-471f-a3f9-7c70c25be55b
Gustavsson, B.
5ef90805-5748-4626-a3b6-85554fac934d
Ivchenko, N.
c892df9e-e2a0-450f-bf77-2673e029f565
Dahlgren, H.
8d021086-b328-46fd-affd-a7c8d2b4687e

Whiter, D.K., Lanchester, B.S., Gustavsson, B., Ivchenko, N. and Dahlgren, H. (2010) Using multispectral optical observations to identify the acceleration mechanism responsible for flickering aurora. Journal of Geophysical Research, 115 (A12), A12315. (doi:10.1029/2010JA015805).

Record type: Article

Abstract

We present an analysis of flickering (2–10 Hz) auroras observed with a state-of-the-art multispectral imaging system, Auroral Structure and Kinetics, located in Tromsø, Norway. Short (1–2 s) periods of flickering aurora have been identified in which the frequency of the brightness oscillations decreases or increases smoothly over time. To the authors' knowledge this is the first detailed analysis of such “chirps” in flickering aurora or field-aligned bursts. We have found that the electron precipitation energy is strongly anticorrelated with the flickering frequency during all identified chirps. This result is consistent with the theory that flickering aurora is caused by the resonance interaction between electromagnetic ion cyclotron waves and precipitating electrons and that the wave parallel phase velocity is the primary factor determining the electron acceleration produced by this mechanism. Other current theories known to the authors cannot completely explain our observations.

Full text not available from this repository.

More information

Published date: 2010
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 185975
URI: http://eprints.soton.ac.uk/id/eprint/185975
ISSN: 0148-0227
PURE UUID: 0997e7b9-8777-44e7-bc40-a063e92db326
ORCID for D.K. Whiter: ORCID iD orcid.org/0000-0001-7130-232X

Catalogue record

Date deposited: 11 May 2011 13:23
Last modified: 12 Nov 2019 01:43

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×