Periods and frequency drifts of groups of the decimetric spikes in two solar flares

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00597663" target="_blank" >RIV/67985815:_____/24:00597663 - isvavai.cz</a>

Result on the web

<a href="https://hdl.handle.net/11104/0355538" target="_blank" >https://hdl.handle.net/11104/0355538</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11207-024-02359-y" target="_blank" >10.1007/s11207-024-02359-y</a>

Result language

angličtina

Original language name

Periods and frequency drifts of groups of the decimetric spikes in two solar flares

Original language description

We studied the radio emission occurring as narrowband decimetric spikes observed during the 10 May 2022 and 26 August 2022 flares. In the radio spectra, these spikes were distributed in groups that occurred quasi-periodically with the periods 5.1 s in the 10 May 2022 flare and 9.1 s in the 26 August 2022 flare. In some parts of these groups, even subgroups of spikes distributed with the quasi-periods of 0.19 s (10 May 2022 flare), and 0.17 s and 0.21 s (26 August 2022 flare) were found. Some of these subgroups even drifted to higher or lower frequencies, which was observed for the first time. At the time of the dm-spikes observation, a pair of reconnecting loops are identified in the SDO/AIA EUV observations of the 10 May 2022 flare, one of which is interpreted as belonging to a small erupting filament. We propose that these loops reconnect in the dynamic quasi-periodic regime (the period 0.19 s) and this reconnection is modulated by an oscillation of one of the interacting loops (the period 5.1 s). Accelerated electrons from this process are trapped in reconnecting plasma outflows, and thus the drifting groups of spikes are generated. The 26 August 2022 flare is a complex event with several systems of bright loops, nevertheless, it also shows a disintegrating erupting filament similar to the 10 May 2022 flare, meaning that the dm-spikes are likely generated by similar reconnection processes.

Czech name

—

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

<a href="/en/project/GA22-34841S" target="_blank" >GA22-34841S: Science with Solar Orbiter: Focusing on eruptive processes</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

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

299

Issue of the periodical within the volume

8

Country of publishing house

DE - GERMANY

Number of pages

16

Pages from-to

113

UT code for WoS article

001295912100003

EID of the result in the Scopus database

2-s2.0-85201715749