Narrowband Spikes Observed During the 13 June 2012 Flare in the 800-2000 MHz Range

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F22%3A00557400" target="_blank" >RIV/67985815:_____/22:00557400 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1007/s11207-022-01989-4" target="_blank" >https://doi.org/10.1007/s11207-022-01989-4</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11207-022-01989-4" target="_blank" >10.1007/s11207-022-01989-4</a>

Result language

angličtina

Original language name

Narrowband Spikes Observed During the 13 June 2012 Flare in the 800-2000 MHz Range

Original language description

Narrowband (similar to 5 MHz) and short-lived (similar to 0.01 s) spikes with three different distributions in the 800 2000 MHz radio spectrum of the 13 June 2012 flare are detected and analyzed. We designate them as SB (spikes distributed in a broad band or bands), SZ (spikes distributed in zebra-like bands) and SBN (spikes distributed in broad and narrow bands). On analyzing AIA/SDO images of the active region NOAA 11504, a rough correspondence between groups of the spikes observed at 1000 MHz and peaks in the time profiles of AIA channels taken from the flare subarea close to the leading sunspot is found. Among the types of spikes the SZ type is the most interesting because it resembles zebras. Therefore, using autocorrelation and crosscorrelation methods we compare SZ and SBN spikes with the typical zebra observed in the same frequency range. While the ratio of SZ band frequencies with their frequency separation (220 MHz) is about 4, 5, and 6, in the zebra the frequency stripe separation is about 24 MHz and the ratio is around 50. Moreover, the bandwidth of SZ bands, which consists of clouds of narrowband spikes, is much broader than that of zebra stripes. This comparison indicates that SZ spikes are generated in a different way from the zebra, but in a similar way to SBN spikes. We successfully fit the SZ band frequencies by the Bernstein modes. Based on this fitting we interpret SZ and SBN spikes as those generated in the model of Bernstein modes. Thus, the magnetic field and plasma density in the SZ spike source are estimated to be about 79 G and 8.4 x 10(9) cm(-3), respectively.

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

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

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

297

Issue of the periodical within the volume

5

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

17

Pages from-to

54

UT code for WoS article

000792622700001

EID of the result in the Scopus database

2-s2.0-85129727617