Федеральное государственное бюджетное учреждение науки Физический институт им. П. Н. Лебедева Российской академии наук

Федеральное государственное бюджетное учреждение науки
Физический институт им. П.Н.Лебедева
Российской академии наук

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Богачёв Сергей Александрович
доктор физ.-мат. наук

Лаборатория «Рентгеновская астрономия Солнца» Главный научный сотрудник, доктор наук г. Москва Ленинский пр-т. 53с4 к. 275

Ученый совет ФИАН Член совета

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2015

A. Reva, S. Shestov, I. Zimovets, S. Bogachev, S. Kuzin
Wave-like formation of Hot Loop Arcades 1 международная конференция 'Прикладная оптика-2004'. Сборник трудов. Т.2. Оптические технологии и материалы., vol. 290, N10, pp. 2909, (2015)
аннотация

We present observations of hot arcades made with the Mg XII spectroheliograph onboard the CORONAS-F mission, which provides monochromatic images of hot plasma in the Mg XII 8.42 Å resonance line. The arcades were observed to form above the polarity inversion line between active regions NOAA 09847 and 09848 at four successive episodes: at 09:18, 14:13, and 22:28 UT on 28 February 2002, and at 00:40 UT on 1March 2002. The evolution of the arcades can be described as: a) a small flare (precursor) appeared near the edge of the still invisible arcade, b) the arcade brightened in a wave-like manner – closer loops brightened earlier, and c) the arcade intensity gradually decreased in 1 h. The esti- mated wave speed was 700 kms−1, and the distance between the hot loops was 50 Mm. The arcades formed without visible changes in their magnetic structure. The arcades were probably heated up by the instabilities of the current sheet above the arcade, which were caused by a magnetohydrodynamic wave excited by the precursor