Volume 37 Issue 3
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Article Navigation >  Chinese Journal of Space Science  > 2017  >  37(3): 249-261
ZHANG Ye, SHI Liqin, CUI Yanmei, LIU Siqing. Research on Characteristics of X-class Solar Proton Flare[J]. Chinese Journal of Space Science, 2017, 37(3): 249-261. doi: 10.11728/cjss2017.03.249
Citation: ZHANG Ye, SHI Liqin, CUI Yanmei, LIU Siqing. Research on Characteristics of X-class Solar Proton Flare[J]. Chinese Journal of Space Science, 2017, 37(3): 249-261. doi: 10.11728/cjss2017.03.249
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Research on Characteristics of X-class Solar Proton Flare

doi: 10.11728/cjss2017.03.249

  • 1. National Space Science Center, Chinese Academy of Sciences, Beijing 100190;

  • 2. University of Chinese Academy of Sciences, Beijing 100049

  • Received Date: 2016-03-02
  • Rev Recd Date: 2016-12-15
  • Publish Date: 2017-05-15
    Abstract
  • Solar Proton Events (SPE) often accompany with solar flares, and the probability that solar proton events triggered by X-class flares is larger than that triggered by other types of flares. In order to improve the forecast accuracy of solar proton events triggered by X-class flares, the relation between proton/non-proton flares and space environmental parameters, including X-ray integrated flux, source region, CME speed, CME angle width, ambient solar wind speed, and ambient X-ray flux, are analyzed statistically. The results show that the distributions of X-ray integrated flux, heliolongitude, CME speed, and CME angle width are different for non-proton and proton flares. Non-proton flares are mostly located at eastern part, where X-ray integrated flux is less than 0.3J·m-2 and CME speed is less than 1300km·s-1. While proton flares are mostly located at central and western part, where X-ray integrated flux is greater than 0.3J·m-2 and CME speed is greater than 1300km·s-1. Furthermore, halo CMEs are often associated with proton flares, while angle width distribution of CMEs that accompanied with non-proton flares is relatively disperse. For proton and non-proton flares, the distribution of their ambient solar wind speed and ambient X-ray flux are similar. According to the different characteristics of the SPEs for proton and non-proton flares, the accuracy of SPE forecast can be improved.

     

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