Observation of the 2005 January 20 GLE Event Using Yangbajing Solar Neutron Telescope & Neutron Monitor |
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Authors: | 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 |
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Institution: | 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 |
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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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