Decimetric radio bursts observed during the onset of solar eruptive flares

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00637211" target="_blank" >RIV/67985815:_____/25:00637211 - isvavai.cz</a>

Result on the web

<a href="https://hdl.handle.net/11104/0368158" target="_blank" >https://hdl.handle.net/11104/0368158</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11207-025-02505-0" target="_blank" >10.1007/s11207-025-02505-0</a>

Result language

angličtina

Original language name

Decimetric radio bursts observed during the onset of solar eruptive flares

Original language description

In this paper, we present the results of our analysis of solar eruptive flares observed by the Ondřejov radiospectrographs over more than three decades. By combining the eruptive flare model with findings from our magnetohydrodynamic and particle-in-cell simulations, we demonstrate the crucial role of decimetric radio bursts in understanding plasma processes during eruptive flares. We describe unusual drifting continua associated with the rise of a magnetic rope at the onset of these flares. Notably, we report very rare slowly positively drifting bursts (SPDBs) linked to the bright helical structure of the ascending rope. Drifting pulsation structures (DPSs) are identified as signatures of plasmoids, while narrowband decimetric spikes are associated with magnetic reconnection outflows. We also examine pairs of decimetric Type III bursts, which indicate electron beams propagating both upward and downward in the solar atmosphere from the acceleration site, as well as a special Type III burst likely traveling around a plasmoid. We introduce a method for computing period maps and identifying a unique wave/shock feature in the radio spectrum. A movie illustrating the plasma processes responsible for generating the drifting pulsation structure is also shown. The interpretations of all presented bursts are based on the standard model of eruptive flares. However, positional data for sources of these radio bursts are often lacking. To emphasize the importance of spatial information, we present an example of a drifting pulsation structure observed simultaneously with observations from the Expanded Owens Valley Solar Array (EOVSA). Finally, we summarize all discussed bursts in a comprehensive scheme that extends our knowledge about a role of decimetric bursts at the onset of eruptive flares.

Czech name

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Czech description

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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

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

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

Name of the periodical

Solar Physics

ISSN

0038-0938

e-ISSN

1573-093X

Volume of the periodical

300

Issue of the periodical within the volume

7

Country of publishing house

DE - GERMANY

Number of pages

20

Pages from-to

92

UT code for WoS article

001521638600001

EID of the result in the Scopus database

2-s2.0-105010126665