Observation of O+ (4P-4D0) lines in electron aurora over Svalbard
Observation of O+ (4P-4D0) lines in electron aurora over Svalbard
This work reports on observations of O+ lines in aurora over Svalbard, Norway. The Spectrographic Imaging Facility measures auroral spectra in three wavelength intervals (H, N+2 1N(0,2) and N+2 1N(1,3)). The oxygen ion 4P-4D0 multiplet (4639–4696 A° ) is blended with the N+2 1N(1,3) band. It is found that in electron aurora, the brightness of this multiplet, is on average, about 0.1 of the N+2 1N(0,2) total brightness. A joint optical and incoherent scatter radar study of an electron aurora event shows that the ratio is enhanced when the ionisation in the upper E-layer (140–190 km) is significant with respect to the E-layer peak below 130 km. Rayed arcs were observed on one such occasion, whereas on other occasions the auroral intensity was below the threshold of the imager. A one-dimensional electron transport model is used to estimate the cross section for production of the multiplet in electron collisions, yielding 0.18×10-18 cm2.
meteorology and atmospheric dynamics (airglowand aurora), ionosphere (particle precipitation)
2805-2817
Ivchenko, N.
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Rees, M.H.
6ecc0166-51bf-4afd-9471-acbb415fd156
Lanchester, B.S.
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Lummerzheim, D.
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Galand, M.
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Throp, K.
b14b4229-a670-4280-85f5-57c1a2f3bd69
Furniss, I
9314f96a-03d7-4e78-9ced-64538122471a
October 2004
Ivchenko, N.
c892df9e-e2a0-450f-bf77-2673e029f565
Rees, M.H.
6ecc0166-51bf-4afd-9471-acbb415fd156
Lanchester, B.S.
e864533e-eea0-471f-a3f9-7c70c25be55b
Lummerzheim, D.
6432baa4-48ac-4203-bc2d-973de7f3efde
Galand, M.
bce54d89-783b-411e-b926-5c803f6a2a31
Throp, K.
b14b4229-a670-4280-85f5-57c1a2f3bd69
Furniss, I
9314f96a-03d7-4e78-9ced-64538122471a
Ivchenko, N., Rees, M.H., Lanchester, B.S., Lummerzheim, D., Galand, M., Throp, K. and Furniss, I
(2004)
Observation of O+ (4P-4D0) lines in electron aurora over Svalbard.
Annales Geophysicae, 22 (8), .
Abstract
This work reports on observations of O+ lines in aurora over Svalbard, Norway. The Spectrographic Imaging Facility measures auroral spectra in three wavelength intervals (H, N+2 1N(0,2) and N+2 1N(1,3)). The oxygen ion 4P-4D0 multiplet (4639–4696 A° ) is blended with the N+2 1N(1,3) band. It is found that in electron aurora, the brightness of this multiplet, is on average, about 0.1 of the N+2 1N(0,2) total brightness. A joint optical and incoherent scatter radar study of an electron aurora event shows that the ratio is enhanced when the ionisation in the upper E-layer (140–190 km) is significant with respect to the E-layer peak below 130 km. Rayed arcs were observed on one such occasion, whereas on other occasions the auroral intensity was below the threshold of the imager. A one-dimensional electron transport model is used to estimate the cross section for production of the multiplet in electron collisions, yielding 0.18×10-18 cm2.
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Published date: October 2004
Keywords:
meteorology and atmospheric dynamics (airglowand aurora), ionosphere (particle precipitation)
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Local EPrints ID: 37649
URI: http://eprints.soton.ac.uk/id/eprint/37649
ISSN: 0992-7689
PURE UUID: 67c058db-3364-48ad-9a2d-b09f0939f2d2
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Date deposited: 24 May 2006
Last modified: 15 Mar 2024 08:00
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Contributors
Author:
N. Ivchenko
Author:
M.H. Rees
Author:
B.S. Lanchester
Author:
D. Lummerzheim
Author:
M. Galand
Author:
K. Throp
Author:
I Furniss
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