Proton spectrum of the 2005 January 20 solar flare

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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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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

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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