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Simulation of VLF chorus emissions in the magnetosphere and comparison with THEMIS spacecraft data
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SYSNO ASEP 0477290 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Simulation of VLF chorus emissions in the magnetosphere and comparison with THEMIS spacecraft data Author(s) Demekhov, A. G. (RU)
Taubenschuss, Ulrich (UFA-U) RID, ORCID
Santolík, Ondřej (UFA-U) RID, ORCIDNumber of authors 3 Source Title Journal of Geophysical Research-Space Physics. - : Wiley - ISSN 2169-9380
Roč. 122, č. 1 (2017), s. 166-184Number of pages 19 s. Publication form Print - P Language eng - English Country US - United States Keywords VLF chorus ; THEMIS data ; numerical simulations Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects LH15304 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UFA-U - RVO:68378289 UT WOS 000395655800015 EID SCOPUS 85010653111 DOI 10.1002/2016JA023057 Annotation We present results of numerical simulations of VLF chorus emissions based on the backward wave oscillator model and compare them with Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft data from the equatorial chorus source region on the early morning side at a radial distance of 6 Earth radii. Specific attention is paid to the choice of simulation parameters based on experimental data. We show that with known parameters of the geomagnetic field, plasma density, and the initial wave frequency, one can successfully reproduce individual chorus elements in the simulation. In particular, the measured growth rate, wave amplitude, and frequency drift rate are in agreement with observed values. The characteristic interval between the elements has a mismatch of factor 2. The agreement becomes perfect if we assume that the inhomogeneity scale of the magnetic field along the field line is half of that obtained from the T96 model. Such an assumption can be justified since the T96 model does not fit well for the time of chorus observations, and there is a shear in the observed field which indicates the presence of local currents. 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 2018
Number of the records: 1