太阳毫秒Spike的秒级和毫秒级时间结构的一种可能解释

AN INTERPRETATION ON THE MILLISECOND-AND SECONDSCALE TIME STRUCTURES IN THE RADIO SPIKE RADIATION

本文对太阳射电ms-Spike的秒级和毫秒级时间结构进行了理论研究,提出在磁拱中MHD非线性"腊肠"模振荡期间,电子束被来回反射于振荡形成的两相邻磁镜点之间,形成损失锥分布;上行的损失锥分布的电子驱动的电子回旋微波激射(ECM)不稳定性波模产生能被地球接收的ms-Spike,由于MHD非线性"腊肠"模的振荡调制,ms-Spike呈现出秒级周期性.这一调制周期与损失锥分布的电子束演化周期相一致.

In the present paper, the time structures in solar radio spike radiation have been studied. We suggest that during the oscillations of the nonlinear magnetohydrodynamic 'sausage' wave modes, the energetic electron beams are reflected to and for between each two adjacent magnetic mirror points, forming the loss-cone distributions in which the upward moving electron beams drive the growth of the wave modes of electron cyclotron maser instabilities, and generate the millisecond-scale spike radiation. In the meanwhile, the sausage wave modes modulate the ms-spike radiation with the period of second-scale. This modulation period is consistent with the evolution period of the electron beams in the loss-cone distributions.