Temperature dependent growth rates of the upper-hybrid waves and solar radio zebra patterns

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F17%3A00478528" target="_blank" >RIV/67985815:_____/17:00478528 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/17:00096271

Výsledek na webu

<a href="http://dx.doi.org/10.1051/0004-6361/201629717" target="_blank" >http://dx.doi.org/10.1051/0004-6361/201629717</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201629717" target="_blank" >10.1051/0004-6361/201629717</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Temperature dependent growth rates of the upper-hybrid waves and solar radio zebra patterns

Popis výsledku v původním jazyce

We aim to study in detail the double plasma resonance instability of hot electrons, together with a much denser thermal background plasma. In particular, we analyse how the growth rate of the instability depends on the temperature of both the hot plasma and background plasma components. We numerically integrated the analysed model equations, using Python and Wolfram Mathematica. We found that the growth-rate maxima of the upper-hybrid waves for non-zero temperatures of both the hot and background plasma are shifted towards lower frequencies comparing to the zero temperature case. This shift increases with an increase of the harmonic number s of the electron cyclotron frequency and temperatures of both hot and background plasma components. We show how this shift changes values of the magnetic field strength estimated from observed zebras. We confirmed that for a relatively low hot electron temperature, the dependence of growth rate vs. both the ratio of the electron plasma and electron cyclotron frequencies expresse distinct peaks, and by increasing this temperature these peaks become smoothed. We found that in some cases, the values of wave number vector components for the upper-hybrid wave for the maximal growth rate strongly deviate from their analytical estimations. We confirmed the validity of the assumptions used when deriving model equations.

Název v anglickém jazyce

Temperature dependent growth rates of the upper-hybrid waves and solar radio zebra patterns

Popis výsledku anglicky

We aim to study in detail the double plasma resonance instability of hot electrons, together with a much denser thermal background plasma. In particular, we analyse how the growth rate of the instability depends on the temperature of both the hot plasma and background plasma components. We numerically integrated the analysed model equations, using Python and Wolfram Mathematica. We found that the growth-rate maxima of the upper-hybrid waves for non-zero temperatures of both the hot and background plasma are shifted towards lower frequencies comparing to the zero temperature case. This shift increases with an increase of the harmonic number s of the electron cyclotron frequency and temperatures of both hot and background plasma components. We show how this shift changes values of the magnetic field strength estimated from observed zebras. We confirmed that for a relatively low hot electron temperature, the dependence of growth rate vs. both the ratio of the electron plasma and electron cyclotron frequencies expresse distinct peaks, and by increasing this temperature these peaks become smoothed. We found that in some cases, the values of wave number vector components for the upper-hybrid wave for the maximal growth rate strongly deviate from their analytical estimations. We confirmed the validity of the assumptions used when deriving model equations.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GAP209%2F12%2F0103" target="_blank" >GAP209/12/0103: Rádiová a rentgenová diagnostika procesů primárního uvolňování energie ve slunečních erupcích a jejich numerické simulace</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Astronomy & Astrophysics

ISSN

1432-0746

e-ISSN

—

Svazek periodika

598

Číslo periodika v rámci svazku

February

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

6

Strana od-do

"A106/1"-"A106/6"

Kód UT WoS článku

000394465000105

EID výsledku v databázi Scopus

2-s2.0-85012088574