University of Oulu

Kocharov, Leon; Mishev, Alexander; Pohjolainen, S.; Reiner, M.J.; Lee, Jeongwoo; Laitinen, T.; Didkovsky, L.V.; Pizzo, V.J.; Kim, Roksoon; Klassen, A.; Karlicky, M.; Cho, Kyung-Suk; Kovaltsov, G.A.; Usoskin, I.G.; Valtonen, E.; Vainio, R. 2017 Origin of two extreme solar particle events. 35th international cosmic ray conference, ICRC2017, The astroparticle physics conference. 12-20 July 2017, Bexco, Busan, Korea, PoS(ICRC2017)146,

Origin of two extreme solar particle events

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Author: Kocharov, Leon1; Mishev, Alexander2; Pohjolainen, S.3;
Organizations: 1Sodankylä Geophysical Observatory (Oulu unit), University of Oulu, Finland
2Space Climate Research Unit, University of Oulu, Oulu FI-90014, Finland
3Tuorla Observatory, University of Turku, Piikkiö FI-21500, Finland
4Catholic University of America, Washington DC and NASA/Goddard Space Flight Center, USA
5Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea
6A.F.Ioffe Physical-Technical Institute, Saint-Petersburg 194017, Russia
7Jeremiah Horrocks Institute, University of Central Lancashire,Preston PR1 2HE, UK
8University of Southern California Space Sciences Center,Los Angeles CA 90089, USA
9NOAA Space Weather Prediction Center, Boulder CO 80305, USA
10Korea Astronomy and Space Science Institute, Daejeon 305-348, Korea
11Inst. für Experimentelle und Angewandte Physik, Christian Albrechts Universität, Kiel, Germany
12Astronomical Institute of the Czech Academy of Sciences, Ondˇrejov 251 65, Czech Republic
13University of Science and Technology, Daejeon 305-348, Korea
14Space Research Laboratory, University of Turku, Turku FI-20014, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.2 MB)
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Language: English
Published: Sissa, 2017
Publish Date: 2017-11-01


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 magnetosphere 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.

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Series: POS. Proceedings of science
ISSN: 1824-8039
ISSN-E: 1824-8039
ISSN-L: 1824-8039
Article number: 146
Host publication: 35th international cosmic ray conference, ICRC2017, The astroparticle physics conference. 12-20 July 2017, Bexco, Busan, Korea
Conference: International Cosmic Ray Conference
Type of Publication: B3 Article in conference proceedings
Field of Science: 115 Astronomy and space science
Funding: This study was supported by the Academy of Finland projects 260596, 258963, and 272157 (Center of Excellence ReSoLVE). A.K. was supported by the German DLR under grant 50 OC 1302, J.L. was supported by the BK21 Plus Program (21A20131111123) funded by the Ministry of Education (MOE, Korea) and National Research Foundation of Korea (NRF), M.K. was supported from Grant P209/12/0103 of the Grant Agency of the Czech Republic.
Academy of Finland Grant Number: 260596
Detailed Information: 260596 (Academy of Finland Funding decision)
258963 (Academy of Finland Funding decision)
272157 (Academy of Finland Funding decision)
Copyright information: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).