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| Titel |
A parametric study of the numerical simulations of triggered VLF emissions |
| VerfasserIn |
D. Nunn, M. Rycroft, V. Trakhtengerts |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 23, no. 12 ; Nr. 23, no. 12 (2005-12-23), S.3655-3666 |
| Datensatznummer |
250015431
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| Publikation (Nr.) |
 copernicus.org/angeo-23-3655-2005.pdf |
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| Zusammenfassung |
| 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. |
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