Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 36812 10.12737/stp-61202001 Reviews Reviews Reviews Quasi-periodic pulsations in solar and stellar flares. Review Quasi-periodic pulsations in solar and stellar flares. Review Куприянова Елена Геннадьевна Kupriyanova Elena Gennadievna elenku@bk.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Колотков Дмитрий Юрьевич Kolotkov Dmitrii Yurievich d.kolotkov.1@warwick.ac.uk Накаряков Валерий Михайлович Nakariakov Valery Mihailovich V.Nakariakov@warwick.ac.uk

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Кауфман Анастасия Сергеевна Kaufman Anastasiia Sergeevna deres@iszf.irk.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Главная (Пулковская) астрономическая обсерватория РАН Санкт-Петербург Россия Central Astronomical Observatory at Pulkovo of RAS Saint Petersburg Russian Federation Уорикский Университет Ковентри Великобритания University of Warwick Coventry United Kingdom Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russian Federation Уорикский Университет Ковентри Великобритания University of Warwick Coventry United Kingdom Санкт-Петербургский филиал Специальной астрофизической обсерватории РАН Санкт-Петербург Россия Saint Petersburg branch of Special Astrophysical Observatory RAS Saint Petersburg Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russian Federation 6 1 3 23 https://naukaru.ru/en/nauka/article/36812/view

This paper provides an overview of the state-of-the-art studies of oscillatory processes in solar and stellar flares, based on modern observational data from ground-based and space-borne instruments with high temporal, spatial, and spectral resolution in different bands of the electromagnetic spectrum. We examine the mecha-nisms that generate flare emission and its quasi-periodic modulation. We discuss similarities and differences be-tween solar and stellar flares, and address associated problems of superflares on the Sun and space weather. Quasi-periodic pulsations (QPPs) of flare emission are shown to be an effective tool for diagnosing both the flare processes themselves and the parameters of flaring plasmas and accelerated particles. We consider types of QPPs, their statistical properties, and methods of analysis, taking into account the non-stationarity of the QPPs’ parameters. We review the proposed mechanisms of QPPs and summarize open questions.

This paper provides an overview of the state-of-the-art studies of oscillatory processes in solar and stellar flares, based on modern observational data from ground-based and space-borne instruments with high temporal, spatial, and spectral resolution in different bands of the electromagnetic spectrum. We examine the mecha-nisms that generate flare emission and its quasi-periodic modulation. We discuss similarities and differences be-tween solar and stellar flares, and address associated problems of superflares on the Sun and space weather. Quasi-periodic pulsations (QPPs) of flare emission are shown to be an effective tool for diagnosing both the flare processes themselves and the parameters of flaring plasmas and accelerated particles. We consider types of QPPs, their statistical properties, and methods of analysis, taking into account the non-stationarity of the QPPs’ parameters. We review the proposed mechanisms of QPPs and summarize open questions.

 Sun solar activity solar flares stellar flares quasi-periodic pulsations Sun solar activity solar flares stellar flares quasi-periodic pulsations

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