Dynamics and Characteristics of Waves in the Zebra Radio Source

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F22%3A00556100" target="_blank" >RIV/67985815:_____/22:00556100 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1007/s11207-022-01950-5" target="_blank" >https://doi.org/10.1007/s11207-022-01950-5</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11207-022-01950-5" target="_blank" >10.1007/s11207-022-01950-5</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dynamics and Characteristics of Waves in the Zebra Radio Source

Popis výsledku v původním jazyce

We analyzed the 17 August 1998 zebra event and showed that some quasi-periodic oscillations modulate the zebra-stripe frequencies. We determined the period of these oscillations as P-n = 2.01 +/- 0.03 (in numbers of zebra stripes) and as P-f = 11.8 +/- 0.17 MHz. In the first part of the analyzed zebra, we found a stable density wave that slowly propagated with the frequency drift less than 0.4 MHz s(-1). Then, a stationary density wave appeared followed by a transformation of the waves to ones with longer periods. These long-period waves were recorded before and after the time interval when no zebra stripes were observed. We interpreted these density waves as magnetosonic waves. We calculated their wavelength and propagating velocity, considering two types of density models of the solar atmosphere. We also estimated the characteristic density and magnetic-field strength as N approximate to 9.2 x 10(8) cm(-1) and B approximate to 0.73 G, respectively. We found similar velocities derived from drifts of the density wave and velocities calculated from the density and magnetic-field strength considering gyro-harmonic numbers of zebra stripes.

Název v anglickém jazyce

Dynamics and Characteristics of Waves in the Zebra Radio Source

Popis výsledku anglicky

We analyzed the 17 August 1998 zebra event and showed that some quasi-periodic oscillations modulate the zebra-stripe frequencies. We determined the period of these oscillations as P-n = 2.01 +/- 0.03 (in numbers of zebra stripes) and as P-f = 11.8 +/- 0.17 MHz. In the first part of the analyzed zebra, we found a stable density wave that slowly propagated with the frequency drift less than 0.4 MHz s(-1). Then, a stationary density wave appeared followed by a transformation of the waves to ones with longer periods. These long-period waves were recorded before and after the time interval when no zebra stripes were observed. We interpreted these density waves as magnetosonic waves. We calculated their wavelength and propagating velocity, considering two types of density models of the solar atmosphere. We also estimated the characteristic density and magnetic-field strength as N approximate to 9.2 x 10(8) cm(-1) and B approximate to 0.73 G, respectively. We found similar velocities derived from drifts of the density wave and velocities calculated from the density and magnetic-field strength considering gyro-harmonic numbers of zebra stripes.

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/GA20-07908S" target="_blank" >GA20-07908S: Třírozměrná magnetická rekonexe v počátečních fázích slunečních erupcí: Pozorování a Standardní model ve 3D</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Solar Physics

ISSN

0038-0938

e-ISSN

1573-093X

Svazek periodika

297

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

35

Kód UT WoS článku

000768833100001

EID výsledku v databázi Scopus

2-s2.0-85126527579