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Chinese Physics C> 2007, Vol. 31> Issue(4) : 341-344 

Observation of the 2005 January 20 GLE Event Using Yangbajing Solar Neutron Telescope & Neutron Monitor

  •  Key Lab. of Particle Astrophysics, Institute of High Energy Physics, CAS, Beijing 100049, China2 National Center for Space Weather, National Satellite Meteorological Center, Beijing 100081, China

  • A solar cosmic rays Ground Level Enhancement(GLE) event associated with a X7.1/2b solar flare in 2005 January 20 was observed by the Yangbajing solar neutron telescope(SNT) and neutron monitor(NM), located at Yangbajing Tibet(90.53°E, 30.11°N, 4310m a.s.l) with the highest vertical geomagnetic cut-off rigidity of 14.1GV in NM network. The statistical significance of the counting rate enhancement recorded by solar neutron telescope in >40MeV channel was 3.7σ in the time window of 07:00—07:05UT and 6.0σ in the time window of 07:00—07:20UT, respectively. The onset time of 06:51—06:52UT for this GLE event was clearly observed by the Yangbajing NM. Our observation indicates that solar protons have been accelerated up to energies of >10GeV during this solar event.
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ZHU Feng-Rong, WANG Rui-Guang, TANG Yun-Qiu, LU Hong, CHEN Song-Zhan, CHENG Ning, FENG Zhao-Yang, GUO Yi-Qing, SHI Feng, WANG Yun-Gang, WANG Yue, TAN You-Heng, ZHANG Hu, Observation of the 2005 January 20 GLE Event Using Yangbajing Solar Neutron Telescope & Neutron Monitor[J]. Chinese Physics C, 2007, 31(4): 341-344.
ZHU Feng-Rong, WANG Rui-Guang, TANG Yun-Qiu, LU Hong, CHEN Song-Zhan, CHENG Ning, FENG Zhao-Yang, GUO Yi-Qing, SHI Feng, WANG Yun-Gang, WANG Yue, TAN You-Heng, ZHANG Hu, Observation of the 2005 January 20 GLE Event Using Yangbajing Solar Neutron Telescope & Neutron Monitor[J]. Chinese Physics C, 2007, 31(4): 341-344. shu
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Received: 2006-07-24
Revised: 2006-11-15
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Observation of the 2005 January 20 GLE Event Using Yangbajing Solar Neutron Telescope & Neutron Monitor

    Corresponding author: ZHU Feng-Rong,
  • Key Lab. of Particle Astrophysics, Institute of High Energy Physics, CAS, Beijing 100049, China2 National Center for Space Weather, National Satellite Meteorological Center, Beijing 100081, China
  • Received Date: 2006-07-24
  • Accepted Date: 2006-11-15
  • Available Online: 2007-04-05

Abstract: A solar cosmic rays Ground Level Enhancement(GLE) event associated with a X7.1/2b solar flare in 2005 January 20 was observed by the Yangbajing solar neutron telescope(SNT) and neutron monitor(NM), located at Yangbajing Tibet(90.53°E, 30.11°N, 4310m a.s.l) with the highest vertical geomagnetic cut-off rigidity of 14.1GV in NM network. The statistical significance of the counting rate enhancement recorded by solar neutron telescope in >40MeV channel was 3.7σ in the time window of 07:00—07:05UT and 6.0σ in the time window of 07:00—07:20UT, respectively. The onset time of 06:51—06:52UT for this GLE event was clearly observed by the Yangbajing NM. Our observation indicates that solar protons have been accelerated up to energies of >10GeV during this solar event.

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