Estimation of the Flux Upper Limit for a Solar Energetic Proton Beam

WANG Rui-Guang; YU Zhong-Qiang; DING Lin-Kai; MA Yu-Qian; ZHU Qing-Qi

Chinese Physics C> 2004, Vol. 28> Issue(10) : 1017-1020

Estimation of the Flux Upper Limit for a Solar Energetic Proton Beam

Institute of High Energy Physics,CAS,Beijing 100039,China2 Institute of Science and Technology for Opto Electron Information,Yantai University,Yantai 264005,China

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Abstract：
Associated with solar flare of 14 July 2000,a muon counting rate enhancement from a narrow sky window was observed by a shallow underground muon detector. This muon counting rate excess was very possibly caused by a directional solar proton beam produced in this flare. Starting from an incident solar proton beam at the top of the atmosphere, following with its interaction in atmosphere and propagating of the produced muons down to the underground detector,a full simulation was carried out in order to estimate the corresponding energies of primary protons and to deduce the upper limit on the flux of solar protons. From this work, for solar protons above 40GeV, under hypothesis of a power law index of -6,the integral flux upper limit is set to be 5.1×10-3/(cm2·sr·s)at 90% confidence level.

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WANG Rui-Guang, YU Zhong-Qiang, DING Lin-Kai, MA Yu-Qian and ZHU Qing-Qi. Estimation of the Flux Upper Limit for a Solar Energetic Proton Beam[J]. Chinese Physics C, 2004, 28(10): 1017-1020.

WANG Rui-Guang, YU Zhong-Qiang, DING Lin-Kai, MA Yu-Qian and ZHU Qing-Qi. Estimation of the Flux Upper Limit for a Solar Energetic Proton Beam[J]. Chinese Physics C, 2004, 28(10): 1017-1020. shu

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Received: 2004-05-24
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Estimation of the Flux Upper Limit for a Solar Energetic Proton Beam

Corresponding author: WANG Rui-Guang,

Institute of High Energy Physics,CAS,Beijing 100039,China2 Institute of Science and Technology for Opto Electron Information,Yantai University,Yantai 264005,China

Received Date: 2004-05-24
Accepted Date: 1900-01-01
Available Online: 2004-10-05

Abstract: Associated with solar flare of 14 July 2000,a muon counting rate enhancement from a narrow sky window was observed by a shallow underground muon detector. This muon counting rate excess was very possibly caused by a directional solar proton beam produced in this flare. Starting from an incident solar proton beam at the top of the atmosphere, following with its interaction in atmosphere and propagating of the produced muons down to the underground detector,a full simulation was carried out in order to estimate the corresponding energies of primary protons and to deduce the upper limit on the flux of solar protons. From this work, for solar protons above 40GeV, under hypothesis of a power law index of -6,the integral flux upper limit is set to be 5.1×10-3/(cm2·sr·s)at 90% confidence level.