太阳活动高年期间(1978—1981)耀斑-行星际激波传播的三维平均特性——日本行星际闪烁(IPS)观测的初步分析

文中通过对行星际激波传播的动力学效应的考虑,根据日本的IPS观测资料,对太阳活动高年期间85个耀斑-IPS激波事件进行了统计研究.结果表明:(1)激波的传播相对耀斑法线方向是非对称传播.传播最快的方向,就经度而言趋向行星际螺旋形磁场方向;就纬度而言很接近在此事件期间日球电流片的平均纬度.(2)传播的纬度范围(-60°— +40°)远比传播的经度范围(<—90°—+90°)小.(3)激波的能量分布有明显的东-西、南-北不对称性,它决定了激波传播的非对称特性.所研究的85个耀斑-激波的平均能量～2.7×1031尔格(单位立体角).上述结果与我们分析美国圣地亚哥IPS观测所得结果基本一致3]. 

Three Dimensional Propagation Characteristics of the Flare-Associated Interplanetary Shock Wave During 1978-1981

The three-dimensional propagation characteristics of the iflare-associated shock wave are studied from Japanese IPS data of 85 flares (importance > 2) events during the period of high-solar activity years of 1978-1981. In this paper, the influnences of the dynamical effects of shock wave propagation on. the IPS data are considered. The results show that: (1) the propagation of the shock wave is asymmetrical relative to the normal direction of the flare. With regard to longitude, -the fastest direction tends to that of the interplanetary magnetic field, and with regard to latitude it tends to that of the average position of the heliospherical current sheet during the period of 85 flare events; (2) propagating range of the latitudes ( - 60°-+40°) is less than that of the longitudes(>±90); (3) there are more marked east-west and south-north asymmetries in the distribution of the shock wave energy, which determine the aniso-tropies of the shock wave propagation. The average energy is about 2.7×1031 ergs/ster for the studied 85 flare-IPS shock wave events.These results are Wassieally consistent with that obtained by analysing American IBS data3], and also coincident with that of the spacecraft observations tod the indirect results of inverstigations 7-8. So it is reasonable to think that the magnetic structures near the sun and the interplanetary large-scale solar wind structures would exert significant modulating effects on the three-dimensional propagation of the shock wave.