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基于NOAA卫星数据的辐射带质子投掷角分布研究

杨世超 张贤国 王月 王春琴 常峥 秦慕荣 王世金

杨世超, 张贤国, 王月, 王春琴, 常峥, 秦慕荣, 王世金. 基于NOAA卫星数据的辐射带质子投掷角分布研究[J]. 空间科学学报, 2014, 34(4): 390-397. doi: 10.11728/cjss2014.03.390
引用本文: 杨世超, 张贤国, 王月, 王春琴, 常峥, 秦慕荣, 王世金. 基于NOAA卫星数据的辐射带质子投掷角分布研究[J]. 空间科学学报, 2014, 34(4): 390-397. doi: 10.11728/cjss2014.03.390
Yang Shichao, Zhang Xianguo, Wang Yue, Wang Chunqin, Chang Zheng, Qin Murong, Wang Shijin. Pitch Angle Distribution Research of Radiation Belt Protons Based on the NOAA Data[J]. Journal of Space Science, 2014, 34(4): 390-397. doi: 10.11728/cjss2014.03.390
Citation: Yang Shichao, Zhang Xianguo, Wang Yue, Wang Chunqin, Chang Zheng, Qin Murong, Wang Shijin. Pitch Angle Distribution Research of Radiation Belt Protons Based on the NOAA Data[J]. Journal of Space Science, 2014, 34(4): 390-397. doi: 10.11728/cjss2014.03.390

基于NOAA卫星数据的辐射带质子投掷角分布研究

doi: 10.11728/cjss2014.03.390
基金项目: 国家自然科学基金项目资助(41204119)
详细信息
    通讯作者:

    杨世超,E-mail:chao-1987@163.com

    张贤国,E-mail:zhangxg@nssc.ac.cn

  • 中图分类号: P353.4

Pitch Angle Distribution Research of Radiation Belt Protons Based on the NOAA Data

  • 摘要: 利用NOAA-12卫星数据对空间环境平静时期太阳同步轨道处辐射带质子投掷角分布进行了研究. 根据投掷角分布的经验公式,计算出90°投掷角的质子方向强度和各向异性指数n. 质子投掷角分布按n的取值范围可分为三类,即90°峰值分布、平顶分布和蝴蝶形分布. 观测证实,对于辐射带质子,三种分布类型均存在并且具有明显的空间区域特征. 在内辐射带边缘地区90°峰值分布占主要优势;在外辐射带高L值区域,90°峰值分布明显减少,平顶分布和蝴蝶形分布逐渐增多. 针对90°峰值分布,研究了质子强度各向异性的区域分布特征,对于内辐射带区域,n值随L值的增大而增大,对于外辐射带,n值表现为逐渐下降的趋势. 为了研究质子投掷角分布对磁地方时的依赖关系,分析了能量为250~800keV的质子在两个不同磁地方时范围的投掷角分布规律. 结果显示,在内辐射带,质子强度的投掷角分布相对稳定,随磁地方时的变化并不显著;而在外辐射带的高L值区域,质子强度的投掷角分布随磁地方时变化明显,与磁地方时之间有明显的依赖关系.

     

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出版历程
  • 收稿日期:  2013-07-08
  • 修回日期:  2013-10-14
  • 刊出日期:  2014-07-15

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