The secular variation of inner zone high energy proton environment in the SAA  

作　　者：XIE Lun PU Zuyin JIAO Weixin FU suiyan 

机构地区：[1]Department of Geophysics, Peking University, Beijing 100871, China Department of Geophysics, Peking University, Beijing 100871, China Department of Geophysics, Peking University, Beijing 100871, China Department of Geophysics, Peking University, Beijing 100871, China

出　　处：《Science China Earth Sciences》2005年第12期2123-2130,共8页中国科学（地球科学英文版）

基　　金：This work was supported by SRFDP,the NSFC project(Grant No.49984002);the Chinese Key Research Project(Grant No.G200000784).

摘　　要：A long-term variation of the inner zone high-energy proton environment at low orbits was investigated by DSTM using the adiabatic approximation of charge particle motion with NASA standard radiation models as reference states. The DST results show that over the past three decades the fluxes of high-energy protons at ～1000 km in the South Atlantic Anomaly (SAA) noticeably increased, the center region of proton SAA apparently moved westward and expanded. Calculations of the L-shell averaged lifetime of high-energy protons indicate that the DST pro-vides a reasonable means for estimation of the secular variation of inner zone proton environ-ment.A long-term variation of the inner zone high-energy proton environment at low orbits was investigated by DSTM using the adiabatic approximation of charge particle motion with NASA standard radiation models as reference states. The DST results show that over the past three decades the fluxes of high-energy protons at ～1000 km in the South Atlantic Anomaly (SAA) noticeably increased, the center region of proton SAA apparently moved westward and expanded. Calculations of the L-shell averaged lifetime of high-energy protons indicate that the DST pro-vides a reasonable means for estimation of the secular variation of inner zone proton environ-ment.

关 键 词：DSTM  radiation belt  SAA  DRIFT shell  SECULAR variation. 

分 类 号：N[自然科学总论]