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- Title
The Frequency of Occurrence of Pre-Flare Fluctuations in Microwave Radiation of Active Regions.
- Authors
Abramov-Maximov, V. E.; Bakunina, I. A.
- Abstract
We present a study of the frequency of occurrence of quasi-periodic fluctuations (QPFs) of microwave radiation from solar active regions at the pre-flare stage. We used correlation curves obtained with the Nobeyama Radioheliograph (NoRH). We analyzed 529 flares of classes X, M, and C (according to the GOES classification). In a significant number of considered events (approximately 75% of the powerful flares and 50% of the weaker flares), preflare fluctuations of microwave radiation with a duration of up to ten pulses are observed. The character of preflare fluctuations is different in different cases. In some cases, almost harmonic oscillations are observed. In most cases, the fluctuations are sporadic and look like a sequence of weak flares. It is possible that the nature of the preflare QPFs is different in different cases.
- Subjects
SOLAR flares; SOLAR active regions; SOLAR radiation; HARMONIC oscillators; RADIATION
- Publication
Geomagnetism & Aeronomy, 2023, Vol 63, Issue 7, p916
- ISSN
0016-7932
- Publication type
Article
- DOI
10.1134/S0016793223070022