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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/00216208:11320/17:10371319

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/LH15304" target="_blank" >LH15304: Umístění analyzátoru elektromagnetických vln ELMAVAN na umělé družice projektu Resonance, zpracování a interpretace získaných dat</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Geophysical Research: Space Physics

ISSN

2169-9380

e-ISSN

—

Svazek periodika

122

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

19

Strana od-do

166-184

Kód UT WoS článku

000395655800015

EID výsledku v databázi Scopus

2-s2.0-85010653111