太阳活动异常低年银河宇宙线特性研究  

Analysis of cosmic ray intensity in 2009

作　　者：王晶[1] 程永宏[1] 叶宗海[1] 刘四清[1] 

机构地区：[1]中国科学院空间科学与应用研究中心

出　　处：《地球物理学进展》2013年第5期2207-2212,共6页Progress in Geophysics

基　　金：国家863计划重点项目(2009AA122205);国家重点基础研究计划(2012CBB25606)共同资助

摘　　要：本文统计分析了2009年地面宇宙线观测数据与ACE卫星宇宙线观测数据的通量变化．研究发现，2009年地面宇宙线中子强度比第19-23活动周的太阳活动极小年平均高出3％以上，达到了近50年的最大值；ACE卫星部分重粒子在2009年的通量比1998年平均高出30％以上，并且Z≥10，100-400MeV／nuc的粒子通量比1998年高出52．2％，这些分析结果表明2009年宇宙线通量异常高．Cosmic rays are energetic particles originating from outer space that impinge on Earth＇s atmosphere. Almost 90% of all the incoming cosmic ray particles are protons, about 9% are helium nuclei and about 1% are electrons . Cosmic rays in the energy range from several hundred MeV to tens of GeV are subject to heliospheric modulation which changes their intensity and spectrum during the ll-year solar cycle. In solar maximum year, cosmic ray intensity is high and in solar minimum year cosmic ray intensity is low. By analyzing the cosmic rays data observed on ground, we found the cosmic ray intensity in 2009 have averagely increased 3% beyond the 19-23 solar minimum, and hits 50-year high. Based on the cosmic rays data observed by ACE satellite, we also found the flux of some elements averagely increased 30% beyond 1998 and the flux of elements which Z≥10,100% 400 MeV/nul increased 50% beyond 1998. The results show that the cosmic ray intensity in 2009 were abnormal high.

关 键 词：宇宙线 太阳活动 通量 

分 类 号：P352[天文地球—空间物理学]