First analysis of ground-level enhancement (GLE) 72 on 10 September 2017 : first analysis of ground-level enhancement (GLE) 72 on 10 September 2017
|Author:||Mishev, A.1,2; Usoskin, I.1,2; Raukunen, O.3;|
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
|Online Access:||PDF Full Text (PDF, 2.4 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2019100431176
|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.
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
115 Astronomy and space science
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 (Academy of Finland Funding decision)
© 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: https://doi.org/10.1007/s11207-018-1354-x.