University of Oulu

Mishev, A., Usoskin, I., Raukunen, O. et al. Sol Phys (2018) 293: 136.

First analysis of ground-level enhancement (GLE) 72 on 10 September 2017 : first analysis of ground-level enhancement (GLE) 72 on 10 September 2017

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Author: Mishev, A.1,2; Usoskin, I.1,2; Raukunen, O.3;
Organizations: 1Space Climate Research Unit, University of Oulu, Oulu, Finland
2Sodankylä Geophysical Observatory (Oulu unit), University of Oulu, Oulu, Finland
3Department of Physics and Astronomy, University of Turku, Turku, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 2.4 MB)
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Language: English
Published: Springer Nature, 2018
Publish Date: 2019-10-04


Using data obtained with neutron monitors and space-borne instruments, we analyzed the second ground-level enhancement (GLE) of Solar Cycle 24, namely the event of 10 September 2017 (GLE 72), and derived the spectral and angular characteristics of associated GLE particles. We employed a new neutron-monitor yield function and a recently proposed model based on an optimization procedure. The method consists of simulating particle propagation in a model magnetosphere in order to derive the cutoff rigidity and neutron-monitor asymptotic directions. Subsequently, the rigidity spectrum and anisotropy of GLE particles are obtained in their dynamical evolution during the event on the basis of an inverse-problem solution. The derived angular distribution and spectra are discussed briefly.

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Series: Solar physics
ISSN: 0038-0938
ISSN-E: 1573-093X
ISSN-L: 0038-0938
Volume: 293
Article number: 136
DOI: 10.1007/s11207-018-1354-x
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: This work was supported by the Academy of Finland (project No. 272157, Center of Excellence ReSoLVE and project No. 267186).
Academy of Finland Grant Number: 272157
Detailed Information: 272157 (Academy of Finland Funding decision)
Copyright information: © Springer Nature B.V. 2018. This is a post-peer-review, pre-copyedit version of an article published in Sol Phys. The final authenticated version is available online at: