Statistical study of the detection of solar protons of highest energies at 20 January 2005

Cosmic Ray research in Armenia

“…This was the first time that we detected a significant enhancement of the >5 GeV muons coinciding with the GLE detected by the world-wide networks of Neutron Monitors. Detailed statistical analysis of the peak [35] proves a non-random nature of the detected enhancement. This short enhancement (see Fig.…”

“…All 3 sites have total area ~0. 35 19 eV is a continuation of the MAKET-ANI and GAMMA arrays energy domain of 10 14 -10 17 eV, thus providing continuous partial energy spectra in the energy range covering 5 orders of magnitude where almost all the significant features of energy spectra are located. No operating or planned surface array is intended to cover this very important and large energy domain: the KASCADE energy limit is ~10 18 eV, the energy ranges of HighRes and Auger start from 5×10 18 eV.…”

Search for solar energetic particle signals in the Mexico City neutron monitor database

“…Due to the site's high cutoff rigidity (8.27 GV) and high median response energy of the instrument to solar particles (10.7 GeV), any such detection would provide evidence for the production of high energy particles by solar eruptive phenomena. We found only one signal on November 2, 1992, whose significance could be validated by two different statistical tests, namely, Student's test (Karapetyan 2008;Beisembaev et al 2009) and extremum statistics test (Chapman, Rowland & Watkins 2002;Chilingarian 2009). Some authors (Shea & Smart 2008;Belov, Eroshenko & Kryakunova 2009) have studied the distribution of Ground Level Enhancements (GLE's) along the solar cycle, but it's not clear what is the relationship between sunspot numbers and GLE frequency, intensity or spectra.…”

“…This has motivated different studies with data from high cutoff rigidity neutron monitors (Debrunner et al 1997;Karapetyan 2008;Beisembaev et al 2009;Chilingarian 2009). Therefore, we decided to search for GLE signals in the whole database of Mexico City neutron monitor (http://132.248.105.25/).…”