Oscillations of the Microwave Emission of Solar Active Region 12673 before Flares

Abramov-Maximov, V. E.; Bakunina, I. A.

doi:10.1134/s001679321907003x

Cited by 10 publications

(5 citation statements)

References 12 publications

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“…Много случаев возрастания мощности КПФ перед вспышками с большим разнообразием квазипериодов от 3-х до 100 минут были обнаружены с использованием данных наблюдений на радиогелиографе Нобеяма (NoRH) [16][17][18][19][20][21].…”

Section: (According To Goes) the Wave-train At 17 Ghz Begins Approxim...unclassified

Pre-Flare Fluctuations of the Radio Emission of Solar Active Regions

Abramov-Maximov,

Bakunina

2023

Proceedings of the 27th All-Russia Conference on Solar and Solar-Terrestrial Physics

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Section: (According To Goes) the Wave-train At 17 Ghz Begins Approxim...unclassified

Pre-Flare Fluctuations of the Radio Emission of Solar Active Regions

Abramov-Maximov,

Bakunina

2023

Proceedings of the 27th All-Russia Conference on Solar and Solar-Terrestrial Physics

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“…Ряд случаев возрастания мощности КПФ перед вспышками с периодами от 3-х до 100 минут был обнаружен с использованием данных наблюдений на радиогелиографе Нобеяма (NoRH) [16][17][18][19][20][21].…”

Section: Doi: 1031725/0552-5829-2022-9-12unclassified

Pre-Flare Fluctuations of the Microwave Emission of Active Regions

Abramov-Maximov¹,

Bakunina²

2022

Proceedings of the 26th All-Russia Conference on Solar and Solar-Terrestrial Physics

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We present a study of quasi-periodic fluctuations (QPFs) of microwave emission of solar active regions (ARs) on pre-flare stage. We used observational data on the Nobeyama radioheliograph (NoRH) (correlation plots). We analyzed all flares of X and M classes (according GOES classification) that occurred during the time intervals of observations on NoRH. In a significant part of the considered cases, the appearance (or significant enhancement) of fluctuation processes is observed before flares. The QPFs periods are different in different cases: from several seconds to several minutes. The duration of the preflare trains of oscillations in the periods of oscillations is approximately the same in all cases and does not exceed 10 pulses. Character of pre-flare fluctuations different in different cases. In some events there are almost harmonic oscillations, in some ones they look more like a sequence of weak flares. Possibly, the nature of pre-flare fluctuations different in different cases.

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“…Угловое разрешение составляет 10''-20'' на частоте 17 ГГц, что позволяет выделять в активных областях пятенные и межпятенные источники радиоизлучения. С использованием данных наблюдений NoRH был обнаружен ряд случаев возрастания мощности КПК перед вспышками с периодами от 3-х до 100 минут [17][18][19][20][21]. Аналогичный эффект был обнаружен в мягком рентгеновском излучении по данным GOES [22].…”

Section: Doi: 1031725/0552-5829-2021-15-18unclassified