caa a22 4500 44534654X CHVBK 20180317142830.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s11207-010-9678-1 doi (NATIONALLICENCE)springer-10.1007/s11207-010-9678-1 Intense Ground-Level Enhancements of Solar Cosmic Rays During the Last Solar Cycles [Elektronische Daten] [M. Andriopoulou, H. Mavromichalaki, C. Plainaki, A. Belov, E. Eroshenko] Ground-level enhancements of solar cosmic rays are sharp increases of short duration in the counting rates of ground-based neutron monitors. Their study is of particular importance, mainly due to their involvement in a vast range of applications such as the prediction of particle fluxes that may be harmful for satellite systems and telecommunication, the analysis of the interplanetary conditions, and the prediction of strong geomagnetic storms. In this work, we make a statistical analysis of the ground-level enhancements events occurring during solar Cycles 22 and 23, in an effort to reveal their common properties and possible physical mechanisms. Data of one- and five-minute resolutions are used, obtained from the worldwide network of neutron monitors and from the high-resolution NMDB database. The analysis includes onset-time calculations, determination of the maximum cosmic ray intensity, and determination of the longitudinal and latitudinal distribution. Moreover, a brief description of the most intense events is given. Finally, the importance of such astatistical analysis in space weather studies is discussed. Springer Science+Business Media B.V., 2010 Cosmic rays nationallicence Solar energetic particles nationallicence Neutron monitors nationallicence Andriopoulou M. Physics Department, University of Athens, Athens, Greece aut Mavromichalaki H. Physics Department, University of Athens, Athens, Greece aut Plainaki C. Physics Department, University of Athens, Athens, Greece aut Belov A. IZMIRAN Russian Academy of Sciences after Puskov, Moscow, Russia aut Eroshenko E. IZMIRAN Russian Academy of Sciences after Puskov, Moscow, Russia aut Solar Physics Springer Netherlands 269/1(2011-03-01), 155-168 0038-0938 269:1<155 2011 269 11207 https://doi.org/10.1007/s11207-010-9678-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-010-9678-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Andriopoulou M. Physics Department, University of Athens, Athens, Greece aut NATIONALLICENCE 700 1- Mavromichalaki H. Physics Department, University of Athens, Athens, Greece aut NATIONALLICENCE 700 1- Plainaki C. Physics Department, University of Athens, Athens, Greece aut NATIONALLICENCE 700 1- Belov A. IZMIRAN Russian Academy of Sciences after Puskov, Moscow, Russia aut NATIONALLICENCE 700 1- Eroshenko E. IZMIRAN Russian Academy of Sciences after Puskov, Moscow, Russia aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 269/1(2011-03-01), 155-168 0038-0938 269:1<155 2011 269 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer