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On the numerical modelling of VLF chorus dynamical spectra
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SYSNO ASEP 0332612 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title On the numerical modelling of VLF chorus dynamical spectra Title Numerické modelování dynamického spektra emisí typu chorus Author(s) Nunn, D. (GB)
Santolík, Ondřej (UFA-U) RID, ORCID
Rycroft, M. (GB)
Trakhtengerts, V. (RU)Source Title Annales Geophysicae. - : Copernicus - ISSN 0992-7689
Roč. 27, č. 6 (2009), s. 2341-2359Number of pages 19 s. Publication form web - web Language eng - English Country US - United States Keywords chorus ; numerical modelling Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects GA205/06/1267 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z30420517 - UFA-U, BC-A (2005-2011) UT WOS 000267543600009 Annotation This paper presents a study of the use of a one-dimensional Vlasov Hybrid Simulation (VHS) computer code to simulate the dynamical spectra (I.e. Frequency versus time spectrograms) of ELF/VLF chorus signals (from a fraction to 10 kHz). Recently excellent measurements of chorus have been made in the source region close to the geomagnetic equator aboard the four spacecraft Cluster mission. Using Cluster data for wave amplitude, which is up to 300 pT, local gyrofrequency, cold plasma density, and Lshell, observed chorus signals are reproduced with remarkable fidelity and, in particular, sweep rates in the range 1–10 kHz result as observed. Further, we find that the sweep rate is a falling function of increasing cold plasma density, again in accord with observations. Finally, we have satisfactorily simulated the rather rare falling frequency elements of chorus which are sometimes observed aboard Cluster in the generation region. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2010
Number of the records: 1