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Modelling the relaxation of red sprite plasma

Modelling the relaxation of red sprite plasma
Modelling the relaxation of red sprite plasma
. Red sprites consist of multiple ionised columns extending above a thunderstorm from ~30 km to ~90 km. Electron densities in these columns are very much larger than the ambient background, perhaps fives times at 70 km. These highly ionized structures cause observable perturbations in subionospheric VLF transmissions known as "VLF Sprites". Three models of initial sprite electron density are considered, and using a realistic ionization relaxation model the time dependence of electron density is derived. A 3-D Born propagation code of is used to compute the time profile of a VLF sprite. Two profiles show good agreement with the time signature experimentally observed, in that scattered amplitude and phase decrease linearly log(t). These simulations provide insight into the nature and structure of sprite columns, and indicate an additional constraint which should be applied to red sprite creation models.
Red Sprites, VLF scattering, VLF Sprites
0094-8276
3293-3296
Nunn, D
5115be8c-b699-427b-b7df-8795398381e5
Rodger, CJ
29c0f59e-a5cb-4269-9fdf-1de3a3504639
Nunn, D
5115be8c-b699-427b-b7df-8795398381e5
Rodger, CJ
29c0f59e-a5cb-4269-9fdf-1de3a3504639

Nunn, D and Rodger, CJ (1999) Modelling the relaxation of red sprite plasma. Geophysical Research Letters, 26 (21), 3293-3296.

Record type: Article

Abstract

. Red sprites consist of multiple ionised columns extending above a thunderstorm from ~30 km to ~90 km. Electron densities in these columns are very much larger than the ambient background, perhaps fives times at 70 km. These highly ionized structures cause observable perturbations in subionospheric VLF transmissions known as "VLF Sprites". Three models of initial sprite electron density are considered, and using a realistic ionization relaxation model the time dependence of electron density is derived. A 3-D Born propagation code of is used to compute the time profile of a VLF sprite. Two profiles show good agreement with the time signature experimentally observed, in that scattered amplitude and phase decrease linearly log(t). These simulations provide insight into the nature and structure of sprite columns, and indicate an additional constraint which should be applied to red sprite creation models.

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Published date: November 1999
Keywords: Red Sprites, VLF scattering, VLF Sprites
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 259017
URI: http://eprints.soton.ac.uk/id/eprint/259017
ISSN: 0094-8276
PURE UUID: 146227c0-6324-42e4-9680-610b7c856d84

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Date deposited: 08 Mar 2004
Last modified: 28 Oct 2019 21:28

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Contributors

Author: D Nunn
Author: CJ Rodger

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