Characteristics of the 2017 September 10 GLE event in relation to shock properties

The solar eruption on 2017 September 10 accompanied a fast coronal mass ejection (CME) and produced a ground level enhancement (GLE) event at Earth. We study the characteristics of the solar energetic particles (SEPs) in the event and the relations between the SEP characteristics and the properties of the shock. The high energy particle intensities observed by the spacecraft near Earth increased quickly after the eruption and had a long duration. We obtain the particle spectra by power law and the spectra of different elements indicate the acceleration efficiency of the shock as the shock propagates and expands out from the corona. The shock fitting presents that the magnetic field line connecting Earth establishes contact with the shock flank in the GLE event. The shock properties suggest quasi-perpendicular acceleration at the early stage and durative acceleration for SEPs.