Počet záznamů: 1
Simulation of VLF chorus emissions in the magnetosphere and comparison with THEMIS spacecraft data
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SYSNO ASEP 0477290 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Simulation of VLF chorus emissions in the magnetosphere and comparison with THEMIS spacecraft data Tvůrce(i) Demekhov, A. G. (RU)
Taubenschuss, Ulrich (UFA-U) RID, ORCID
Santolík, Ondřej (UFA-U) RID, ORCIDCelkový počet autorů 3 Zdroj.dok. Journal of Geophysical Research-Space Physics. - : Wiley - ISSN 2169-9380
Roč. 122, č. 1 (2017), s. 166-184Poč.str. 19 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova VLF chorus ; THEMIS data ; numerical simulations Vědní obor RIV BL - Fyzika plazmatu a výboje v plynech Obor OECD Fluids and plasma physics (including surface physics) CEP LH15304 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Institucionální podpora UFA-U - RVO:68378289 UT WOS 000395655800015 EID SCOPUS 85010653111 DOI 10.1002/2016JA023057 Anotace 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. Pracoviště Ústav fyziky atmosféry Kontakt Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Rok sběru 2018
Počet záznamů: 1