摘要
太阳质子事件是影响空间站和航天员辐射安全的重要环境因素之一,为保障空间站的安全运行和航天员出舱任务规划,开展对太阳能量粒子在地球空间的地磁传输研究。利用反向追迹法和衰减系数计算了不同地磁扰动情况下,400 km载人空间站轨道上的地磁截止刚度和质子截止能量。计算结果表明:地磁扰动情况下的截止刚度大多小于地磁平静时的截止刚度;磁暴期间,全球截止刚度等值线向低纬度移动,中低纬度地区的截止刚度变化不大,中高纬度地区变化剧烈;超强磁暴期间,大约200 MeV以上的高能质子能够到达中国空间站轨道,轨道上太阳高能粒子通量增加,甚至有可能超过辐射带南大西洋异常区(SAA)的通量。
Solar proton events can affect the radiation safety of China Space Station and astronauts.Research on the geomagnetic transmission of solar energetic particles in Earth’s space provides valu-able references for the safe operation of the space station and the planning and execution of astro-nauts’extravehicular activities.Based on tracing particle trajectories and attenuation quotient the geomagnetic cutoff rigidities and the proton cutoff energies of manned space station orbit were calcu-lated.The results showed that the cutoff rigidities during geomagnetic disturbances was generally lower than during geomagnetic quiet periods.During magnetic storms,global cutoff rigidities iso-morphs shifted toward low latitudes,with little change in the mid-low latitude regions,but signifi-cant changes in the mid-high latitude regions.During extreme magnetic storms,high-energy protons above approximately 200 MeV can reach the orbit of China Space Station,leading to a noticeable increase in solar energetic particle flux on the orbit,which may even exceed the flux in the South Atlantic Anomaly(SAA).
作者
钟秋珍
陈雪晴
陈东
程永宏
李志涛
刘四清
师立勤
ZHONG Qiuzhen;CHEN Xueqing;CHEN Dong;CHENG Yonghong;LI Zhitao;LIU Siqing;SHI Liqin(State Key Laboratory of Solar Activity and Space Weather,National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 101408,China;China Aero Polytechnical Establishment,Beijing 100028,China)
出处
《载人航天》
北大核心
2025年第3期320-326,共7页
Manned Spaceflight
基金
中国科学院前瞻战略科技先导专项(XDA0470301)。
关键词
高能粒子
地磁扰动
空间站轨道
地磁截止刚度
energetic particles
geomagnetic disturbance
space station orbit
geomagnetic cutoff ri-gidities
作者简介
第一作者:钟秋珍,女,博士,研究员,研究方向为空间物理。E-mail:zhongqz@nssc.ac.cn。
