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

页码：L87 / L90

页数：4

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