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

24th European Cosmic Ray Symposium

Belov, A.^1 ; Eroshenko, E.^1 ; Kryakunova, O.^2 ; Nikolayevskiy, N.^2 ; Malimbayev, A.^2 ; Tsepakina, I.^2 ; Yanke, V.^1

Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (IZMIRAN), Troitsk, Moscow

142190, Russia^1

Institute of Ionosphere, Kamenskoe Plato, Almaty

050020, Kazakhstan^2

关键词: Ground level;    Ground level enhancements;    High latitude neutron monitors;    Interplanetary space;    Neutron monitors;    Solar cosmic rays;    Solar cycle;    Solar energetic proton;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/632/1/012063/pdf
DOI  :  10.1088/1742-6596/632/1/012063

来源: IOP

【 摘 要 】

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.