First analysis of GLE 72 event on 10 September 2017: Spectral and anisotropy characteristics

Abstract

Using neutron monitor and space-borne data we performed an analysis of the second ground level enhancement of solar cycle 24, namely the event of 10 September 2017 (GLE 72) and derive the spectral and angular characteristics of GLE particles. We employ new neutron monitor yield function and a recently proposed model based on optimization procedure. The method consists of simulation of particle propagation in a model magnetosphere in order to derive the cut-off 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 inverse problem solution. The derived angular distribution and spectra are briefly discussed.

arXiv comment21 pages, 10 figures, 1 table

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• Current status and possible extension of the global neutron monitor network
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• New reconstruction of event-integrated spectra (spectral fluences) for major solar energetic particle events
• Evidence for a Coronal Shock Wave Origin for Relativistic Protons Producing Solar Gamma-Rays and Observed by Neutron Monitors at Earth
• 3D propagation of relativistic solar protons through interplanetary space
• Modeling the 10 September 2017 solar energetic particle event using the iPATH model
• Ionization effect in the Earth's atmosphere during the sequence of October-November 2003 Halloween GLE events