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南大西洋异常区高能质子通量南北向差异

闫兴亚 陈鸿飞 于向前 邹鸿 施伟红

闫兴亚, 陈鸿飞, 于向前, 邹鸿, 施伟红. 南大西洋异常区高能质子通量南北向差异[J]. 空间科学学报, 2016, 36(6): 888-896. doi: 10.11728/cjss2016.06.888
引用本文: 闫兴亚, 陈鸿飞, 于向前, 邹鸿, 施伟红. 南大西洋异常区高能质子通量南北向差异[J]. 空间科学学报, 2016, 36(6): 888-896. doi: 10.11728/cjss2016.06.888
YAN Xingya, CHEN Hongfei, YU Xiangqian, ZOU Hong, SHI Weihong. The Southward and Northward Difference of Proton Flux in South Atlantic Anomaly[J]. Journal of Space Science, 2016, 36(6): 888-896. doi: 10.11728/cjss2016.06.888
Citation: YAN Xingya, CHEN Hongfei, YU Xiangqian, ZOU Hong, SHI Weihong. The Southward and Northward Difference of Proton Flux in South Atlantic Anomaly[J]. Journal of Space Science, 2016, 36(6): 888-896. doi: 10.11728/cjss2016.06.888

南大西洋异常区高能质子通量南北向差异

doi: 10.11728/cjss2016.06.888
基金项目: 

国家自然科学基金项目(41374181)和国家重大科学仪器专项项目(2012YQ03014207)共同资助

详细信息
    通讯作者:

    闫兴亚,E-mail:yanxia0522@163.com

  • 中图分类号: P353.4

The Southward and Northward Difference of Proton Flux in South Atlantic Anomaly

  • 摘要: 利用2012年8月NOAA N15,N16,N17,N18卫星中能质子和电子探测器(MEPED)>6.9MeV质子能档的数据,研究了800km高度处南大西洋异常区(SAA)质子分布的南北方向差异.数据显示,质子计数率沿经线随纬度的变化近似满足高斯分布,且向南运动的质子多于向北运动的质子.MEPED具有0°和90°两个探测方向,可对质子投掷角分布进行估算,从而消除在探测南向和北向质子时探测器方向角偏差所造成的影响.结果表明,在经度40°W、纬度13°S至23°S位置上,仍然存在南向质子比北向质子多20%~30%的现象.其原因可能与地磁异常使南向质子镜像点更低,更多质子散射进入大气层沉降有关.分析还发现,南大西洋异常区质子通量存在地方时变化.日侧比夜侧强约20%,这可能是由于地磁场日变化引起的.

     

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出版历程
  • 收稿日期:  2015-11-13
  • 修回日期:  2016-03-31
  • 刊出日期:  2016-11-15

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