Microwave observations of the rapid propagation of nonthermal sources in a solar flare by the Nobeyama Radioheliograph

被引：39
|
作者：
Yokoyama, T [1 ]
Nakajima, H
Shibasaki, K
Melnikov, VF
Stepanov, AV
机构：
[1] Natl Astron Observ, Minamisa Ku, Nagano 3841305, Japan
[2] Radiophys Res Inst, Nizhnii Novgorod 603600, Russia
[3] Russian Acad Sci, Pulkovo Observ, St Petersburg 196140, Russia
来源：
ASTROPHYSICAL JOURNAL | 2002年 / 576卷 / 01期
关键词：
acceleration of particles; Sun : flares; Sun : radio radiation;
D O I：
10.1086/343098
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We report a Nobeyama Radioheliograph (NoRH) microwave observation of propagating features of nonthermal emission in a solar flare on 1999 August 28, an M2.8 event for the GOES soft X-ray class. The flare had a very extended source (approximate to4.5 x 10(4) km) that was well resolved by the NoRH, and it is confirmed to be a magnetic loop by comparison with the photospheric magnetic field. In the rising phase of the microwave burst, a nonthermal gyrosynchrotron source was observed by the high-rate (10 images per second) observation of the NoRH to propagate from one end of the loop to the other with a speed of 6 x 10(3) km s(-1). We also found a 9 x 10(4) km s(-1) propagation in the same apparent position, which is the first imaging observation of streaming electrons.
引用
收藏
页码：L87 / L90
页数：4
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