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




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

KustantajaSPRINGER

Julkaisuvuosi2018

JournalSolar Physics

Tietokannassa oleva lehden nimiSOLAR PHYSICS

Lehden akronyymiSOL PHYS

Artikkelin numeroARTN 136

Vuosikerta293

Numero10

Sivujen määrä15

ISSN0038-0938

DOIhttps://doi.org/10.1007/s11207-018-1354-x

Rinnakkaistallenteen osoitehttps://research.utu.fi/converis/portal/detail/Publication/36148310


Tiivistelmä
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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