Volume 34 Issue 4
Jul.  2014
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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

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

doi: 10.11728/cjss2014.03.390
  • Received Date: 2013-07-08
  • Rev Recd Date: 2013-10-14
  • Publish Date: 2014-07-15
  • Using the NOAA-12 satellite data, a study on the Pitch Angle Distributions (PADs) of energetic protons is performed during the quiet period of space environment in the Sun-synchronous orbit. The 90° pitch angled proton flux and the anisotropy index n are calculated based on the empirical formula. According to the n values, it's found that the distributions can be classified into three categories: 90° peaked, flattop, and butterfly. For the radiation belt protons, the three types are all existed and have a significant spatial character. The 90° peaked distributions dominate at the edge of inner radiation belt; while at the higher L values region of outer radiation belt, the 90° peaked distributions decrease obviously and the flattop distribution and butterfly distribution gradually increase with the increase of L values. For the 90° peaked distributions, relationship between the anisotropy exponent n and the L values is studied. For inner radiation belt, the n values increase rapidly with the L values increasing; for outer radiation belt, the n values decrease gradually with the L values increasing. The distributions of the radiation belt protons are also studied in two different Magnetic Local Time (MLT) regions for the 250~800keV protons. The results show that the PADs are very similar at the inner radiation belt, but have obvious differences at the higher L values region of outer radiation belt. It indicates that the PADs of radiation belt protons have little dependency on the MLT at the inner radiation belt, while have more dependency on the MLT at the higher L values region of outer radiation belt.

     

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