Recently, from the observed data in different wave bands and different time intervals many people have obtained an 152-day-158-day periodicity of solar flare activity.
近年来，许多人分别从不同波段，不同时段的观测资料，得到太阳耀斑活动存在152天—158天的周期。
2
The results show that: (1) the propagation of the shock wave is asymmetrical relative to the normal direction of the flare.
结果表明：(1)激波的传播相对耀斑法线方向是非对称传播。
3
Three-dimensional propagation properties of the flare-shock wave would bear close relations to the magnetic structure on the sun and the large scale structure in the interplanetary 'space.