Abstract
On January 20, 2005, 7:02–7:04 UT the Aragats Multichannel Muon Monitor (AMMM) registered enhancement of the high energy secondary muon flux (energy threshold ∼5 GeV). The enhancement, lasting 3 min, has statistical significance of ∼4 σ and is related to the X7.1 flare seen by the GOES satellite and the ground level enhancement detected by the world-wide network of neutron monitors and by muon detectors. The most probable proton energy corresponding to the measured 5 GeV muon flux is within 23–30 GeV. Due to upmost importance of the detection of solar particles of highest energies in presented paper we perform detailed statistical analysis of the detected peak. The statistical technique introduced in the paper is also appropriate for the searches of sources of ultra-high energy cosmic rays.
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