Increased Microwave Radiation Brightness as a Sign of Flare-Producing Active Regions Based on Observations of NOAA Active Region 12371

Peterova, N. G.; Topchilo, N. A.; Kurochkin, E. A.

doi:10.1134/s0016793222010145

Cited by 2 publications

(1 citation statement)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The brightness maximum of 2015 took place on 21 June. The maximum was more than 1.1 * 10 6 K for NOAA AR 12371 [5], in which at least two M-class flares occurred from 17 June to 21 June 2015, and from 21 June to 29 June another five M-class flares as well as many C-class flares. If we take a full rotation of the Sun, at the place of NOAA 12371 another more dispersed NOAA AR 12388 appears.…”

Section: Pos(muto2022)066mentioning

confidence: 93%

Forecasting of Solar Flares According to the Maximum Brightness Temperatures in the Period of 2011--2015

Kurochkin¹

2022

Proceedings of the Multifaceted Universe: Theory and Observations - 2022 — PoS(MUTO2022)

View full text Add to dashboard Cite

The main aim of our investigation is the search for new signs to predict solar flares. There are at least two ways to find such signs. The first one is statistical, where it is necessary to analyze a number of active region (AR) physical characteristics (area, full fluxes, spectra, etc.) and find correlations between some physical parameters and the flaring activity of the ARs. The other way is the deep analysis of ARs (specrum types in microwaves, polarization configuration of microwave sources, complexity of photospheric magnetic fields, etc.) to find the physical reasons of flares. The increased brightness of microwave radiation in 2011-2015 is considered as a preflare sign in this paper. There are a number of signs of preflare active region activity both in the optical and radio bands. An example of the preflare sign is the degree of complexity of photospheric magnetic fields in the AR. In microwaves, it is possible to estimate the radio emission flux from the AR or the brightness of radio emission sources at one or several frequencies. This paper analyzes the increased brightness of microwave sources in the 24th cycle of solar activity and the full microwave fluxes of ARs using the RATAN-600 data. It is shown that some ARs with high brightness temperatures generate a number of powerfull (M and X class) flares and also that the spectra of full microwave fluxes of the AR in the case of NOAA 12192 have features of high flare activity.

show abstract

Section: Pos(muto2022)066mentioning

confidence: 93%