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 1D Vlasov Hybrid Simulation (VHS) code. Although this code reproduces observed ground based emissions well there is some uncertainty regardin...
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ftsouthampton:oai:eprints.soton.ac.uk:262149 2023-07-30T03:56:58+02:00 A parametric study of the numerical simulations of triggered VLF emissions Nunn, David Rycroft, Michael Trakhtengerts, Victor 2005 text https://eprints.soton.ac.uk/262149/ https://eprints.soton.ac.uk/262149/1/angeo_23_3655_2005.pdf https://eprints.soton.ac.uk/262149/2/ag05125A.pdf en eng https://eprints.soton.ac.uk/262149/1/angeo_23_3655_2005.pdf https://eprints.soton.ac.uk/262149/2/ag05125A.pdf Nunn, David, Rycroft, Michael and Trakhtengerts, Victor (2005) A parametric study of the numerical simulations of triggered VLF emissions. Annales Geophysicae, 23, 1-12. (doi:10.5194/angeo-23-3655-2005 <http://dx.doi.org/10.5194/angeo-23-3655-2005>). cc_by_4 Article PeerReviewed 2005 ftsouthampton https://doi.org/10.5194/angeo-23-3655-2005 2023-07-09T21:32:01Z 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 1D 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 University of Southampton: e-Prints Soton Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Annales Geophysicae 23 12 3655 3666 |
institution |
Open Polar |
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University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
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 1D 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 |
Nunn, David Rycroft, Michael Trakhtengerts, Victor |
spellingShingle |
Nunn, David Rycroft, Michael Trakhtengerts, Victor A parametric study of the numerical simulations of triggered VLF emissions |
author_facet |
Nunn, David Rycroft, Michael Trakhtengerts, Victor |
author_sort |
Nunn, David |
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 |
publishDate |
2005 |
url |
https://eprints.soton.ac.uk/262149/ https://eprints.soton.ac.uk/262149/1/angeo_23_3655_2005.pdf https://eprints.soton.ac.uk/262149/2/ag05125A.pdf |
long_lat |
ENVELOPE(-83.917,-83.917,-75.917,-75.917) |
geographic |
Siple |
geographic_facet |
Siple |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
https://eprints.soton.ac.uk/262149/1/angeo_23_3655_2005.pdf https://eprints.soton.ac.uk/262149/2/ag05125A.pdf Nunn, David, Rycroft, Michael and Trakhtengerts, Victor (2005) A parametric study of the numerical simulations of triggered VLF emissions. Annales Geophysicae, 23, 1-12. (doi:10.5194/angeo-23-3655-2005 <http://dx.doi.org/10.5194/angeo-23-3655-2005>). |
op_rights |
cc_by_4 |
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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1772815393952366592 |