PROPAGATION EFFECTS OF SOLAR COSMIC RAYS (II)——PROPAGATION CORRECTION OF PEAK SPECTRUM
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摘要: 根据太阳宇宙线传播方程的量纲分析解, 讨论了传播对宇宙线事件峰值谱的影响, 着重指出对其进行传播改正的重要性。太阳风对流是低能谱变坦的可能原因之一, 在一定条件下, 幂律型发射谱可以变成指数型观测谱, 动能幂律谱也可以变成刚度幂律谱。能谱的幂指数随源耀斑的磁方位角而增加, 分布有明显的东西不对称性。进一步对第20周的相对论性太阳质子事件进行传播改正, 求出发射谱, 其中有些可表达成统一指数的幂律谱, 有些仍有低能段趋坦现象。Abstract: The influence of interplaneatry propagation upon the peak spectrum of the solar cosmic say events are discussed in terms of the dimensional solution for the propagation equation with emphasis on the importance of the propagation correction of spectrum.Solar wind convection is one of the probable causes of flattening in low energy spectrum.Under certain conditions, an injected power-law spectrum may change into an observed exponential one, and a kinetic energy spectrum into a rigidity one.The power index of spectrum increases with the magnetic azimuth of source flares, the distribution of which shows a marked east-west asymmetry.Furthermore, the injection spectrum of the relativistic events observed during the 20th solar cycle are evaluated through a correction for the propagation effect, some of the deduced injection spectra may be expressed as a power law with a unitary index, while others are still flattened in the low energy range.
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