Quasiperiodic pulsations in a solar microwave burst (2002).

Content Provider	CiteSeerX
Abstract	Quasiperiodic pulsations in solar flares can provide important information on physical conditions in flaring regions. In this paper we study a microwave burst that showed deep quasiperiodic pulsations. The most dramatic feature of this event has been discussed by Asai et al. (2001): in the second of four bursts during the flare strongly modulated pulsations appear in radio images from the eastern end of a long loop and in hard X-rays from the western end of the loop. In this paper we show in addition that (i) at least five distinct radio sources with very different time profiles can be identified, including emission from the long loop connecting the modulated radio and X-ray sources; (ii) substructure is also present in the radio emission from the eastern end of the long loop during the first burst of the flare, but with timescales shorter than in the second burst; (iii) radio modulations are seen at the western end of the loop during the second burst, but at a level some 20 times weaker than at the eastern end; (iv) these radio modulations at the western end of the loop, like the hard X-ray modulations at the same location, appear to lead the modulations at the eastern end by about 0.5 s,
File Format	PDF
Publisher Date	2002-01-01
Access Restriction	Open
Subject Keyword	Quasiperiodic Pulsation Eastern End Long Loop Solar Microwave Burst Western End Radio Modulation Second Burst Different Time Profile First Burst Hard X-ray Radio Image Dramatic Feature X-ray Source Solar Flare Hard X-ray Modulation Microwave Burst Important Information Radio Emission Distinct Radio Source Deep Quasiperiodic Pulsation Physical Condition
Content Type	Text
Resource Type	Article