Origin of two extreme solar particle events

Leon Kocharov, Alexander Mishev, S. Pohjolainen, M. J. Reiner, Jeongwoo Lee, T. Laitinen, L. V. Didkovsky, V. J. Pizzo, Roksoon Kim, M. Karlicky, A. Klassenk, Kyung Suk Cho, G. A. Kovaltsov, I. G. Usoskin, E. Valtonenn, R. Vainio

Research output: Contribution to journalConference articlepeer-review


We performed an analysis of high-energy particle emission from the Sun in two extreme solar particle events observed even with ground-based neutron monitors (NMs). We model particle transport and interactions from near-Sun source through the solar wind and the Earth's magne-tosphere and atmosphere in order to make a deep analysis of the events. The time profile of the proton source at the Sun is deduced and compared with observed electromagnetic emissions. Several complementary to each other data sets are studied jointly with the broadband dynamic radio spectra EUV images as well as other data available for both events. We find a common scenario for both eruptions including the flare's dual impulsive phase the coronal mass ejection (CME)-launch-associated burst and the late low-frequency type III radio bursts at the time of the relativistic proton injection into the interplanetary medium. The analysis supports the idea that the two considered events start with emission of relativistic protons previously accelerated during the flare and CME launch then trapped in large-scale magnetic loops and later released by the expanding CME.

Original languageEnglish (US)
JournalProceedings of Science
StatePublished - 2017
Externally publishedYes
Event35th International Cosmic Ray Conference, ICRC 2017 - Bexco, Busan, Korea, Republic of
Duration: Jul 10 2017Jul 20 2017

All Science Journal Classification (ASJC) codes

  • General


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