Possible ground level enhancements at the beginning of the maximum of Solar Cycle 24

Anatoly V. Belov, Eugenia A. Eroshenko, O. N. Kryakunova, Nikolay Nikolayevskiy, A. M. Malimbayev, I. L. Tsepakina, Victor G. Yanke

2015

Full text Open access: Gold Metadata (CSL-JSON)

DOI 10.1088/1742-6596/632/1/012063

Data confidence 70 medium

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Abstract

Three solar energetic proton events in the beginning of 2012 (January and March) revealed significant increases of the integral proton fluxes with energies >100 MeV were analyzed by the data from subpolar neutron monitors (>500 MeV). As it was found the event on January 27, 2012 was followed by cosmic ray enhancement of about 2% at several subpolar and high latitude neutron monitors which coincided with the onset of the intensity increase in the GOES channels. This was also confirmed with the GOES/HEPAD data that allow us to consider the event on January 27, 2012 as a Ground Level Enhancement. The events in March 2012 (7.03 and 13.03) occurred under very complicated situation in the interplanetary space and a more detailed analysis is needed. Nevertheless, these events may contain some contribution of solar cosmic rays in the ground level observations.