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Morphology and dynamics of aurora at fine scale: first results from the ASK instrument

Morphology and dynamics of aurora at fine scale: first results from the ASK instrument
Morphology and dynamics of aurora at fine scale: first results from the ASK instrument
The ASK instrument (Auroral Structure and Kinetics) is a narrow field auroral imager, providing simultaneous images of aurora in three different spectral bands at multiple frames per second resolution. The three emission species studied are O2+ (5620 Å), O+ (7319 Å) and O (7774 Å). ASK was installed and operated for the first time in an observational campaign on Svalbard, from December 2005 to March 2006. The measurements were supported by data from the Spectrographic Imaging Facility (SIF). The relation between the morphology and dynamics of the visible aurora and its spectral characteristics is studied for selected events from this period. In these events it is found that dynamic aurora is coupled to high energy electron precipitation. By studying the O2+/O intensity ratio we find that some auroral filaments are caused by higher energy precipitation within regions of lower energy precipitation, whereas other filaments are the result of a higher particle flux compared to the surroundings.
ionosphere (auroral ionosphere, particle pre-cipitation, instruments and techniques)
0992-7689
1041-1048
Dahlgren, H.
8d021086-b328-46fd-affd-a7c8d2b4687e
Ivchenko, N.
c892df9e-e2a0-450f-bf77-2673e029f565
Sullivan, J.
38fa668a-22be-4479-bcac-5d2b54fa526e
Lanchester, B.S.
e864533e-eea0-471f-a3f9-7c70c25be55b
Marklund, G.
ca3a83f3-e335-4d69-b5e3-2dad226e339f
Whiter, D.
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c
Dahlgren, H.
8d021086-b328-46fd-affd-a7c8d2b4687e
Ivchenko, N.
c892df9e-e2a0-450f-bf77-2673e029f565
Sullivan, J.
38fa668a-22be-4479-bcac-5d2b54fa526e
Lanchester, B.S.
e864533e-eea0-471f-a3f9-7c70c25be55b
Marklund, G.
ca3a83f3-e335-4d69-b5e3-2dad226e339f
Whiter, D.
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c

Dahlgren, H., Ivchenko, N., Sullivan, J., Lanchester, B.S., Marklund, G. and Whiter, D. (2008) Morphology and dynamics of aurora at fine scale: first results from the ASK instrument. [in special issue: Atmospheric Studies by Optical Methods] Annales Geophysicae, 26 (5), 1041-1048. (doi:10.5194/angeo-26-1041-2008).

Record type: Article

Abstract

The ASK instrument (Auroral Structure and Kinetics) is a narrow field auroral imager, providing simultaneous images of aurora in three different spectral bands at multiple frames per second resolution. The three emission species studied are O2+ (5620 Å), O+ (7319 Å) and O (7774 Å). ASK was installed and operated for the first time in an observational campaign on Svalbard, from December 2005 to March 2006. The measurements were supported by data from the Spectrographic Imaging Facility (SIF). The relation between the morphology and dynamics of the visible aurora and its spectral characteristics is studied for selected events from this period. In these events it is found that dynamic aurora is coupled to high energy electron precipitation. By studying the O2+/O intensity ratio we find that some auroral filaments are caused by higher energy precipitation within regions of lower energy precipitation, whereas other filaments are the result of a higher particle flux compared to the surroundings.

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More information

Published date: 28 May 2008
Keywords: ionosphere (auroral ionosphere, particle pre-cipitation, instruments and techniques)
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 146813
URI: http://eprints.soton.ac.uk/id/eprint/146813
ISSN: 0992-7689
PURE UUID: 33c85f0f-ee54-4497-bca8-466cae0f62ad
ORCID for D. Whiter: ORCID iD orcid.org/0000-0001-7130-232X

Catalogue record

Date deposited: 22 Apr 2010 14:01
Last modified: 17 Dec 2019 01:43

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