Solar flares and coronal shock waves

被引:39
|
作者
Vrsnak, B [1 ]
机构
[1] Univ Zagreb, Hvar Observ, Fac Geodesy, Zagreb 41000, Croatia
关键词
D O I
10.1029/2000JA004009
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The ignition of coronal shock waves by solar flares is investigated confronting the results of a simple MHD model with the observations. Characteristics of type II bursts recorded in the metric and decametric wavelength range are compared with the properties of the microwave and soft X-ray bursts of the associated flares. The time delay of the type II burst beginning after the onset of a flare is found to be shorter for shorter rise time of a flare burst and for a more powerful flare. Starting frequencies of type II bursts are higher for more impulsive flares. Instantaneous relative bandwidths of the type II bursts are larger for more powerful flares, indicating a higher Mach number of the shock. Consistent with this, a positive correlation between the flare importance and the inferred shock velocity is found. The results are fully consistent with the implications of the model describing the shock formation by a flare-ignited blast wave.
引用
收藏
页码:25291 / 25300
页数:10
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