A MODEL FOR SIMPLE SPIKES OF SOLAR HARD X-RAY BURSTS
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摘要: SMM卫星上γ射线谱仪(GRS)于1980年2月至1982年12月间,观测到103个强硬X:射线爆发(对应的硬X射线谱仪峰值计数率大于60005/s).根据它们的时间轮廓图,发现其中的24个事件含有变化幅度大、时间轮廓平滑的简单脉冲峰。24个峰在54-100keV能道的统计结果显示,时间轮廓的上升相斜率与下降相斜率具有较好的相关性,相关系数达0.80,且上升相斜率略大于下降相斜率,平均值比值约为1.37.为了定量比较,根据它们斜率的平均值构造成了一标准峰模型,上升相与下降相特征时间分别为12.7秒和17.4秒。分析表明,高能电子具有连续的、对称的注入模式,且强哨声波散射条件下的捕获沉降模型是较合适的硬x射线辐射模型。Abstract: Based on the time profiles of 103 strong hard X-ray burst events (their peak rattes are more then6000 c/s according to Hard X-ray Burst Spectrometer) observed by GRS (γ-ray Spectrometer) aboard on SMM (Solar Maximum Mission) satellite from Feb. 1980 to Dec. 1982, it is identified that 24 of them contain the simple impulsive spikes characterized by large amplitude and smooth time profile. The statistical results of the 24 simple spikes in 54-100keVenerge range show that: 1) the spike time profiles' rising slopes correlate well with the falling slopes, and correlation coefficient is about 0.80. 2) rising slope is slightly larger than falling slope, and their averge ratio is about 1.37. Meanwhile, a standard spike is used for quantitative analyzing, whose rising phase characteristic time is about 12.7s and falling phase is 17.4s according to the mean value of the slopes. It then is concluded that the acceleration region continously and symmetrically inject energetic electrons into the loop, and trapplus-precipitation model in strong whistler scattering limit is a proper hard X-ray emission model.
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Key words:
- Hard X-ray /
- Simple impulsive spikes /
- Flare model
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