High-Energy Emissions Observed in the Impulsive Phase of the 2001 August 25 Eruptive Flare

Yushkov, B.Y.; Kurt, •.G.; Galkin, •.I.

Авторы: Yushkov Boris Yu, Kurt •Victoria G., Galkin •Vladimir I.
Журнал: Solar Physics
Том: 298
Год издания: 2023
Издательство: Springer Netherlands
Местоположение издательства: Dordrecht, Netherlands
Номер статьи: 31
DOI: 10.1007/s11207-023-02123-8
Аннотация: We analyze here the impulsive phase of the 2001 August 25 eruptive flare (X5.3, S21, E38) in order to reveal the link of the time evolution of the magnetic-field reconnection rate ϕ(t) ˙ with the energy-release process, as quantified by electron and proton acceleration to high energies. Hard X-rays and γ-rays from 150 keV to 100 MeV were observed by the SONG (SOlar Neutrons and Gamma) detector onboard the CORONAS-F (Complex ORbital ObservatioNs of the Active Sun) mission. The soft X-ray derivative dISXR/dt was used as a proxy for the flare energy release that revealed itself as a sequence of acceleration pulses. The reconnection rate ϕ(t) ˙ was calculated previously from flare-ribbon observations in EUV and coaligned magnetic-field maps. The γ-ray emission spectra were obtained from SONG data. All spectra contain both bremsstrahlung and γ-ray lines. The bremsstrahlung spectrum extends to tens of MeV. The pion-decay gamma-ray emission, being a manifestation of proton acceleration to subrelativistic energies, appeared for the first time in the time interval of the ϕ(t) ˙ maximum. This maximum was ahead of the maxima of dISXR/dt as well as of all other emissions by about one minute. Proton acceleration to subrelativistic energies is confirmed by detection of solar neutrons by SONG and the Chacaltaya neutron monitor
Добавил в систему: Юшков Борис Юрьевич

	ИСТИНА	Войти в систему Регистрация
	ФНКЦ РР
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

ФНКЦ РР

High-Energy Emissions Observed in the Impulsive Phase of the 2001 August 25 Eruptive Flareстатья