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

Result code in 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>

Alternative codes found

RIV/00216224:14310/17:00096271

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GAP209%2F12%2F0103" target="_blank" >GAP209/12/0103: Radio and X-ray diagnostics of primary-energy-release processes in solar flares and their numerical simulations</a><br>

Continuities

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

Publication year

2017

Confidentiality

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

Name of the periodical

Astronomy & Astrophysics

ISSN

1432-0746

e-ISSN

—

Volume of the periodical

598

Issue of the periodical within the volume

February

Country of publishing house

FR - FRANCE

Number of pages

6

Pages from-to

"A106/1"-"A106/6"

UT code for WoS article

000394465000105

EID of the result in the Scopus database

2-s2.0-85012088574