Solar Radio Burst Associated with the Falling Bright EUV Blob

0495334 - ASÚ 2019 RIV US eng J - Journal Article
Karlický, Marian - Zemanová, Alena - Dudík, Jaroslav - Radziszewski, K.
Solar Radio Burst Associated with the Falling Bright EUV Blob.
Astrophysical Journal Letters. Roč. 854, č. 2 (2018), č. článku L29. ISSN 2041-8205. E-ISSN 2041-8213
R&D Projects: GA ČR(CZ) GA16-13277S; GA ČR(CZ) GA17-16447S
Institutional support: RVO:67985815
Keywords : plasmas * Sun flares * radio radiation
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 8.374, year: 2018

At the beginning of the 2015 November 4 flare, in the 1300-2000 MHz frequency range, we observed a very rare slow positively drifting burst. We searched for associated phenomena in simultaneous EUV observations made by IRIS, SDO/AIA, and Hinode/XRT, as well as in H-alpha observations. We found that this radio burst was accompanied with the bright blob, visible at transition region, coronal, and flare temperatures, falling down to the chromosphere along the dark loop with a velocity of about 280 km s(-1). The dark loop was visible in H-alpha but disappeared afterward. Furthermore, we found that the falling blob interacted with the chromosphere as expressed by a sudden change of the H-alpha spectra at the location of this interaction. Considering different possibilities, we propose that the observed slow positively drifting burst is generated by the thermal conduction front formed in front of the falling hot EUV blob.
Permanent Link: http://hdl.handle.net/11104/0288338