A parametric study of the numerical simulations of triggered VLF emissions
This work is concerned with the numerical modelling of VLF emissions triggered in the equatorial region of the Earth's magnetosphere, using a well established 1-D Vlasov Hybrid Simulation (VHS) code. Although this code reproduces observed ground based emissions well there is some uncertainty re...
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ftdoajarticles:oai:doaj.org/article:aafd26995dc9433593ee431985b717bf 2023-05-15T13:51:26+02:00 A parametric study of the numerical simulations of triggered VLF emissions D. Nunn M. Rycroft V. Trakhtengerts 2005-12-01T00:00:00Z https://doi.org/10.5194/angeo-23-3655-2005 https://doaj.org/article/aafd26995dc9433593ee431985b717bf EN eng Copernicus Publications https://www.ann-geophys.net/23/3655/2005/angeo-23-3655-2005.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-23-3655-2005 0992-7689 1432-0576 https://doaj.org/article/aafd26995dc9433593ee431985b717bf Annales Geophysicae, Vol 23, Pp 3655-3666 (2005) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2005 ftdoajarticles https://doi.org/10.5194/angeo-23-3655-2005 2022-12-31T06:52:21Z This work is concerned with the numerical modelling of VLF emissions triggered in the equatorial region of the Earth's magnetosphere, using a well established 1-D Vlasov Hybrid Simulation (VHS) code. Although this code reproduces observed ground based emissions well there is some uncertainty regarding the magnitude of simulation parameters such as saturation wave amplitude, cold plasma density, linear growth rate and simulation bandwidth. Concentrating on emissions triggered by pulses of VLF radio waves from the transmitter at Siple Station, Antarctica (L=4.2), these parameters, as well as triggering pulse length and amplitude, are systematically varied. This parametric study leads to an understanding of the physics of the triggering process and also of how the properties of these emissions, particularly their frequency time profile, depend upon these parameters. The main results are that weak power input tends to generate fallers, intermediate power input gives stable risers and strong growth rates give fallers, hooks or oscillating tones. The main factor determining the frequency sweep rate - of either sign - turns out to be the cold plasma density, lower densities giving larger sweep rates. Article in Journal/Newspaper Antarc* Antarctica Directory of Open Access Journals: DOAJ Articles Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Annales Geophysicae 23 12 3655 3666 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 D. Nunn M. Rycroft V. Trakhtengerts A parametric study of the numerical simulations of triggered VLF emissions |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
This work is concerned with the numerical modelling of VLF emissions triggered in the equatorial region of the Earth's magnetosphere, using a well established 1-D Vlasov Hybrid Simulation (VHS) code. Although this code reproduces observed ground based emissions well there is some uncertainty regarding the magnitude of simulation parameters such as saturation wave amplitude, cold plasma density, linear growth rate and simulation bandwidth. Concentrating on emissions triggered by pulses of VLF radio waves from the transmitter at Siple Station, Antarctica (L=4.2), these parameters, as well as triggering pulse length and amplitude, are systematically varied. This parametric study leads to an understanding of the physics of the triggering process and also of how the properties of these emissions, particularly their frequency time profile, depend upon these parameters. The main results are that weak power input tends to generate fallers, intermediate power input gives stable risers and strong growth rates give fallers, hooks or oscillating tones. The main factor determining the frequency sweep rate - of either sign - turns out to be the cold plasma density, lower densities giving larger sweep rates. |
format |
Article in Journal/Newspaper |
author |
D. Nunn M. Rycroft V. Trakhtengerts |
author_facet |
D. Nunn M. Rycroft V. Trakhtengerts |
author_sort |
D. Nunn |
title |
A parametric study of the numerical simulations of triggered VLF emissions |
title_short |
A parametric study of the numerical simulations of triggered VLF emissions |
title_full |
A parametric study of the numerical simulations of triggered VLF emissions |
title_fullStr |
A parametric study of the numerical simulations of triggered VLF emissions |
title_full_unstemmed |
A parametric study of the numerical simulations of triggered VLF emissions |
title_sort |
parametric study of the numerical simulations of triggered vlf emissions |
publisher |
Copernicus Publications |
publishDate |
2005 |
url |
https://doi.org/10.5194/angeo-23-3655-2005 https://doaj.org/article/aafd26995dc9433593ee431985b717bf |
long_lat |
ENVELOPE(-83.917,-83.917,-75.917,-75.917) |
geographic |
Siple |
geographic_facet |
Siple |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Annales Geophysicae, Vol 23, Pp 3655-3666 (2005) |
op_relation |
https://www.ann-geophys.net/23/3655/2005/angeo-23-3655-2005.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-23-3655-2005 0992-7689 1432-0576 https://doaj.org/article/aafd26995dc9433593ee431985b717bf |
op_doi |
https://doi.org/10.5194/angeo-23-3655-2005 |
container_title |
Annales Geophysicae |
container_volume |
23 |
container_issue |
12 |
container_start_page |
3655 |
op_container_end_page |
3666 |
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1766255304802041856 |