Volume 38 Issue 3
May  2018
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DING Liuguan, CAO Xinxin, WANG Zhiwei, GU Bin. Characteristic Times and Longitudinal Distributions of Gradual Solar Energetic Particle Events[J]. Journal of Space Science, 2018, 38(3): 296-306. doi: 10.11728/cjss2018.03.296
Citation: DING Liuguan, CAO Xinxin, WANG Zhiwei, GU Bin. Characteristic Times and Longitudinal Distributions of Gradual Solar Energetic Particle Events[J]. Journal of Space Science, 2018, 38(3): 296-306. doi: 10.11728/cjss2018.03.296
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Characteristic Times and Longitudinal Distributions of Gradual Solar Energetic Particle Events

doi: 10.11728/cjss2018.03.296

  • 1 Institute of Space Weather, Nanjing University of Information Science and Technology, Nanjing 210044;

  • 2 School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing 210044

  • Received Date: 2017-04-21
  • Rev Recd Date: 2018-02-13
  • Publish Date: 2018-05-15
    Abstract
  • The two characteristic times (onset time tob and release time tsr) and their longitudinal distribution of 30 gradual Solar Energetic Particle (SEP) events from 2011 to 2014, which particle flux increase remarkably in a short time, are analyzed. The results show that the SEP events observed by multi-spacecraft are usually associated with the wider halo Coronal Mass Ejection (CME) than those of general SEP events. The onset time difference of energetic particles observed by two spacecraft presents a good linear correlation with the longitude difference of two spacecraft, and east-west hemispheric asymmetry. The time intervals between the onset and release time and the flare onset are positively correlated with the relative longitude of the detector to the active region. The range of onset time or release time (tslow-tfast) in different energy channels for one SEP event shows a good positive correlation with the relative longitude of spacecraft, and release time ranges in different energy channels have a distinct longitudinal distribution. The release time interval between high and low energy channel has a positive correlation with CME speed. Therefore, the two characteristic times, in-situ onset time and solar particle release time near the sun, have obvious longitudinal distributions, and a strong correlation with the associated CME.

     

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