太阳射电短厘米波精细结构的非线性调制模型

A NON-LINEAR MODULATION MODEL FOR THE FINE STRUCTURES IN THE SOLAR SHORT CENTIMETRE WAVE BURSTS

本文提出一种理论模型:认为太阳短厘米波射电辐射在通过日冕时,可与目冕中的MHD波发生三波共振相互作用,辐射流量会产生非线性调制.这种模型可以很好地解释观测到的精细结构中流量与重复率的反比例关系.而且,理论预期调制周期与射电频率有关,精细结构的调制幅度与射电流量无关.

A theoretical model has been suggested hee. The three-waves resonance interaction can occur when this radio emission interacts with the MHD wave in the corona, while the short centimetre emission from solar radio bursts passes through the corona. These induce a non-linear modulation of the emission flux. This model can satisfactorily interpret the inversely proportional relation between the observed flux and the repetition rates of fine structures in the solar short centimetre wave bursts. Moreover, this theoretical model anticipates that the modulation period is related to the radio frequency, while the modulated amplitude of the fine structures is independent of the radio flux.