摘要
本文分析了1989年3月一系列大耀斑等离子体抛射引起的宇宙线强度变化的特征.除对中子成分分析外,还对μ介子成分及其各向异性特征作了分析,讨论了宇宙线强度变化与太阳耀斑特性和地磁扰动之间的关系。分析发现,宇宙线的Forbush下降不仅与太阳耀斑的级别、持续时间,以及在日面上的位置有关,而且还与光学耀斑是否伴有强的X射线暴、是否有强的射电爆发,以及是否引起强的地磁暴紧密有关.各向异性分析表明,3月大事件的各向异性明显小于宁静时的各向异性,这可能是因为受到太阳活动强烈调制之后,宇宙线各向异性趋于减小的原因.
The characteristics of Forbush decreases of cosmic ray caused by solar flares in March 1989 are analysed in this paper. The anisotropy for μ-meson component are also analysed beside neutron component, and the relationship between the cosmic ray intensity variation and the characteristics of solar flares and geomagnetic activities are discussed. The results show-that Forbush decreases not only bear a relation to the importances, duration and angular distance from the central meridiam of solar flares, but also depend on whether the optical flares are accompanied by strong X-ray bursts and radio bursts, as well as followed by geomagnetic storms of sudden commencement type. The anisotropic analysis shows that the anisotropy of the large cosmic ray storm events in March was obviously weaker than that of the cosmic ray intensity during the quiet days. It is probably because that strong solar activity could reduce the degree of the cosmic ray anisotropy.
出处
《空间科学学报》
CAS
CSCD
北大核心
1990年第4期280-288,共9页
Chinese Journal of Space Science
关键词
宇宙线
太阳
耀斑
Cosmic ray, Solar flare
