根据宇宙线Forbush下降计算地球轨道附近的耀斑击波

本文根据Forbush下降幅度随源耀斑经度分布的东、西不对称性,得到了有关地球轨道附近的一种由耀斑引起的冲击波模型。发现冲击波各向异性传播且表现出东、西不对称性。击波西部是强磁场区,东部为弱磁场区。与此相反,动力学参数和等离子体参数β则是东部比西部高。耀斑产生的扰动有分别向东、西方向的方位角速度存在。该模型同观测资料和理论推论是一致的。它能对磁扰和宇宙线Forbush下降等东、西不对称效应给出统一而自然的解释。耀斑等离子体流的这种东、西不对称性流动的可能起因也作了讨论。

A CALCULATION FOR THE FLARE-PRODUCED SHOCK WAVE NEAR THE EARTH'S ORBIT BASED ON FORBUSH DECREASE OF COSMIC RAYS

In this paper, a model for flare-produced shock wave near the Earth's orbit is obtained based on the east-west asymmetry of Forbush decrease amplitude with the longitudinal distribution of parent flares. It is found that the shock wave propagates anisotropically and shows the east-west asymmetry. A region of intensive magnetic field is in the west part of shock wave and weak in the east. Contrary to this, distri-bution of dynamic parameters and plasma parameters are such that the east part is higher than the west part. The flare-produced disturbances have an azimuthal velocity easterly and westerly respectively. Such a model and theoretical inferences from it agree with observational data. It can give a unified and natural explanation for the east-west asymmetry effects of the magnetic disturbances and Forbush decrease of cosmic rays and others. The possible cause of such an east-west asymmetry of flow of flare-plasma is also discussed.