First analysis of ground-level enhancement (GLE) 72 on 10 September 2017 : first analysis of ground-level enhancement (GLE) 72 on 10 September 2017
Mishev, A.; Usoskin, I.; Raukunen, O.; Paassilta, M.; Valtonen, E.; Kocharov, L.; Vainio, R. (2018-10-04)
Mishev, A., Usoskin, I., Raukunen, O. et al. Sol Phys (2018) 293: 136. https://doi.org/10.1007/s11207-018-1354-x
© 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.
https://rightsstatements.org/vocab/InC/1.0/
https://urn.fi/URN:NBN:fi-fe2019100431176
Tiivistelmä
Abstract
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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