太阳硬X射线爆发揭示的日冕振荡

在第21周太阳活动峰年期间,“太阳峰年”卫星和“火鸟”卫星上的硬x射线爆发探测器探测到数千个硬x射线太阳耀斑.研究这些事件的瞬时特性,我们发现它们当中几百个样品具有1秒以下持续时间的快速尖峰结构.我们分析了其中部分观测资料,发现它们之间具有四个共同特征.在这些特征中,准周期振荡使我们认为,在日冕上可能存在着快速振荡.本文导出了它们的周期表达式并讨论了这种振荡的俘获条件. 

The Coronal Oscillations Revealed by Solar Hard X-ray Bursts

During the 21st solar activity cycle the HXEBS aboard SMM satellite and the HXM on HINOTORI spacecraft detected several thousand hard X-ray solar flares. Studies of the temporal properties of these events had revealed hundreds of examples of fast spikes with durations of less 1 sec. We analysed part of these observations and found that they have four common characteristics. Among these characteristics, quasi-periodic oscillations led us to believe the possibility of existing oscillations in the corona. We have studied the characteristics of the oscillations and derived their periods. The conditions of trapping the oscillations are also discussed.