Drifting Pulsation Structure at the Very Beginning of the 2017 September 10 Limb Flare

0534151 - ASÚ 2021 RIV US eng J - Journal Article
Karlický, Marian - Chen, B. - Gary, D. E. - Kašparová, Jana - Rybák, J.
Drifting Pulsation Structure at the Very Beginning of the 2017 September 10 Limb Flare.
Astrophysical Journal. Roč. 889, č. 2 (2020), č. článku 72. ISSN 0004-637X. E-ISSN 1538-4357
R&D Projects: GA ČR(CZ) GA17-16447S; GA ČR(CZ) GA18-09072S; GA ČR(CZ) GA19-09489S
Institutional support: RVO:67985815
Keywords : solar flares * solar radio emission * reconnection
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 5.877, year: 2020
Method of publishing: Limited access
https://doi.org/10.3847/1538-4357/ab63d0

We study DPS observed in an X8.2-class flare on 2017 September 10 in the context of spatial and spectral diagnostics provided by microwave, EUV, and X-ray observations. We describe DPS and its substructures that were observed for the first time. We use a new wavelet technique to reveal characteristic periods in DPS and their frequency bands. Comparing the periods of pulsations found in this DPS with those in previous DPSs, we found new very short periods in the 0.09-0.15 s range. We present Expanded Owens Valley Solar Array images and spectra of microwave sources observed during the DPS. This DPS at its very beginning has pulsations in two frequency bands (1000-1300 MHz and 1600-1800 MHz), which are interconnected by fast drifting bursts. We show that these double-band pulsations started just at the moment when the ejected filament splits apart in a tearing motion at the location where a signature of the flare current sheet later appeared.
Permanent Link: http://hdl.handle.net/11104/0312381