硬X射线爆发的Hα特征

对50个Ha耀斑检查表明:1.有硬X射线爆发(HXRBS)的耀斑,其Ha的线宽均超过4?,HXRBS对应的Ha耀斑核(在Ha+2?处,J_耀斑核/I_背景≥1.15)至少有两个,它们分处于磁场正负极性区;2.Ha耀斑开始较早, Ha耀斑核(kernel)的强度峰落后HXRBS的峰(spike)数秒,峰与峰之间有很好的对应关系; 3.Ha耀斑核,当HXRBS峰值计数率大于1000时,掩盖黑子半影,峰值计数率小于200时,不掩盖黑子半影。 

The Ha Characteristics of Hard X-ray Bursts

The following results are obtained from the examination of 50 Ha flares. (1) all flares with HXRBS are detectabe from the emission of Hα±2A. They have at least two Ha kernels (I flare/I bac. >1.15 on Hα + 2?) located in the opposite polarity regions; (2) the Ha brigh-tenings start earlier than HXRBS, while the Ha peaks, which correspond to the spikes of HXRBS very well, come later than that of HXRBS by several seconds; (3) if the count rates of HXRBS are more than 1000, the kernels of Hα+2A cover the penumbra, if the count rates are less than 200, the kernels do not cover the penumbra.