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The SEDA-FIB is a detector designed to measure solar neutrons. This solarneutron detector was operated onboard the ISS on July 16, 2009 and March 31,2018. Eighteen large solar flares were later observed by the GOES satellite insolar active region 12673 that appeared on September 4 and lasted untilSeptember 10, 2017, with intensity higher than > M2. In nine of those solarflares, the SEDA-FIB detected clear signals of solar neutrons, along with fiveminor excesses. Among these events, we focus on two associated with the flaresof X2.2 (SOL2017-09-06) and X8.2 (SOL2017-09-10) that share a common feature: aprocess of accelerating electrons into high energies as clearly recorded by theFERMI-GBM detector. These events may provide us with useful information toelucidate the ion acceleration process. The X8.2 event was a limb flare thatproved adequate for fixing the parameters needed to explain the process ofparticle acceleration into high energies. According to our analysis, theelectron acceleration process may possibly be explained by the shockacceleration model. However, we found that it would be difficult to explain thesimultaneous acceleration of ions with electrons, unless the ions werepreheated prior to their rapid acceleration.

Solar Neutrons Observed from September 4 to 10, 2017 by SEDA-FIB