Figure 10: Solar neutron the event number 39,761 detected by the FIB sensor at 20 : 10 : 26 UT on March 11, 2011. The solar direction was located toward the lower left side in - plane (the left side panel), while in the right side panel the solar direction was down ward almost vertically. The energy of the track is estimated as (44 ± 5) MeV and the neutron may be emitted around 19:50:38 UT at the Sun, if the track was induced by the n-p collision.