Simulation of VLF chorus emissions in the magnetosphere and comparison with THEMIS spacecraft data

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F17%3A00477290" target="_blank" >RIV/68378289:_____/17:00477290 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/17:10371319
Result on the web
<a href="http://dx.doi.org/10.1002/2016JA023057" target="_blank" >http://dx.doi.org/10.1002/2016JA023057</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/2016JA023057" target="_blank" >10.1002/2016JA023057</a>

Result language
angličtina
Original language name
Simulation of VLF chorus emissions in the magnetosphere and comparison with THEMIS spacecraft data
Original language description
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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)

Project
<a href="/en/project/LH15304" target="_blank" >LH15304: Implementation of the electromagnetic wave analyzer ELMAVAN for the RESONANCE satellite project, data analysis and interpretation</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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