First Analysis of Ground-Level Enhancement (GLE) 72 on 10 September 2017: Spectral and Anisotropy Characteristics



: A. Mishev, I. Usoskin, O. Raukunen, M. Paassilta, E. Valtonen, L. Kocharov, R. Vainio

Publisher: SPRINGER

: 2018

: Solar Physics

: SOLAR PHYSICS

: SOL PHYS

: ARTN 136

: 293

: 10

: 15

: 0038-0938

DOI: https://doi.org/10.1007/s11207-018-1354-x

: https://research.utu.fi/converis/portal/detail/Publication/36148310


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.

Last updated on 2024-26-11 at 17:20