Investigation of the solar cosmic high-energy rays

Details Investigation of the solar cosmic high-energy rays Investigation of the solar cosmic high-energy rays

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003kfnts...4..153k&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, Suppl, no. 4, p. 153-157

Physics

Scientific paper

We propose to use the ground-based extensive air shower (EAS) arrays and underground muon detectors to study the solar cosmic high-energy rays (SCR) generated during powerful solar flares. During both the 21st and the 22nd solar activity cycles the Baksan Underground Scintillation Telescope (BUST) recorded three short-term bursts of muon intensity correlating with the Ground Level Enhancements (GLE) of SCR. No similar muon bursts were found at the BUST in the current 23rd solar cycle. The primary protons causing those muon bursts have energies greater than 500 GeV, 100 times as large as the threshold energy of the neutron monitors which are used for the SCR study on the Earth surface. The threshold energy of EAS arrays is also greater than that of neutron monitors. The total counting rate of two Baksan EAS arrays ``Andyrchy'' and ``Carpet'' was examined during the GLE events observed in the 23rd solar activity cycle. Significant excesses above the galactic cosmic ray background were found during several GLE events. The statistical accuracy of neutron monitors by the 5-minute data is about 1 %. This quantity for the ``Andyrchy'' and ``Carpet'' is 0.05 % and 0.03 %, respectively. It allows us to fix lesser intensity rises at greater threshold energy of particles. There are GLE events recorded only at the polar neutron monitors (e.g., Apatity), which have low threshold energies (about 1 GeV). The middle-latitude monitors (e.g., Moscow) with a greater threshold didn't show any excess at the same time. In these cases ``Andyrchy'' and ``Carpet'' recorded statistically significant rises (5-8 standard deviations) despite their greater threshold energy - 5.8 GeV. These facts allow us to extend the SCR spectrum of those events to a higher energy region.

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