Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Did the 2000 November 8 solar flare accelerate protons to >=40 GeV?   It has been reported that a 5.7sigma directional muon excess coincident with
the 2000 July 14 solar flare was registered by the L3 precision muon
spectrometer [Ruiguang Wang, Astroparticle Phys., 31(2009) 149]. Using a same
analysis method and similar criteria of event selection, we have analyzed the
L3 precision muon spectrometer data during November 2000. The result shows that
a 4.7sigma muon excess appeared at a time coincident with the solar flare of 8
of November 2000. This muon excess corresponds to above 40 GeV primary protons
which came from a sky cell of solid angle 0.048 sr. The probability of being a
background fluctuation is estimated to be about 0.1%. It has been convinced
that solar protons could be accelerated to tens of GeV in those Class X solar
flares which usually arose solar cosmic ray ground level enhancement (GLE)
events. However, whether a Class M solar flare like the non-GLE event of 8
November 2000 may also accelerate solar protons to such high energies? It is
interesting and noteworthy.

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The categories of this paper are: alg-geom
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The categories of this paper are: q-bio
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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: plasm-ph
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The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: hep-ph