Proton spectrum of the 2005 January 20 solar flare

WANG Rui-Guang

doi:10.1088/1674-1137/32/2/006

Chinese Physics C> 2008, Vol. 32> Issue(2) : 104-107 DOI: 10.1088/1674-1137/32/2/006

Proton spectrum of the 2005 January 20 solar flare

WANG Rui-Guang ^,

Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, CAS, Beijing 100049, China

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An extreme solar cosmic ray event broke out on 2005 January 20. Not only is it the most intensive solar energetic particle (SEP) event, with >100MeV particles measured by GOES satellite since 1986, but it has been the largest ground level enhancement (GLE) event recorded by the ground-based neutron monitors since 1956. This work presents the solar proton spectra for this event with data obtained by GOES in multiple energy channels. These spectra are well fitted by a modified power-law function. The spectral index of around －1 indicates that the January 20 event has a hard energy spectrum. Possible mechanisms for the acceleration of relativistic protons are discussed.

References

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WANG Rui-Guang. Proton spectrum of the 2005 January 20 solar flare[J]. Chinese Physics C, 2008, 32(2): 104-107. doi: 10.1088/1674-1137/32/2/006

WANG Rui-Guang. Proton spectrum of the 2005 January 20 solar flare[J]. Chinese Physics C, 2008, 32(2): 104-107. doi: 10.1088/1674-1137/32/2/006 shu

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Received: 2007-03-26
Revised: 2007-06-14

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Proton spectrum of the 2005 January 20 solar flare

Corresponding author: WANG Rui-Guang,

Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, CAS, Beijing 100049, China

Received Date: 2007-03-26

Accepted Date: 2007-06-14

Available Online: 2008-02-05

Abstract: An extreme solar cosmic ray event broke out on 2005 January 20. Not only is it the most intensive solar energetic particle (SEP) event, with >100MeV particles measured by GOES satellite since 1986, but it has been the largest ground level enhancement (GLE) event recorded by the ground-based neutron monitors since 1956. This work presents the solar proton spectra for this event with data obtained by GOES in multiple energy channels. These spectra are well fitted by a modified power-law function. The spectral index of around －1 indicates that the January 20 event has a hard energy spectrum. Possible mechanisms for the acceleration of relativistic protons are discussed.

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Proton spectrum of the 2005 January 20 solar flare

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