The propa•ga•tion of sola•r neutrons through the a•tmosphere of the E•rth h•s been cMcul•ted by • Monte C•rlo method using • nuclear interaction model which c•n reproduce the existing da•t• obtained by •ccelera•tor experiments. With this calcula•tion, it h•s been found tha•t the ela•stic scattering process plays •n importamt role in the propagation of solar neutrons in the •tmosphere •t •n incident energy below ,,• 200 MeV. By a•pplying this c•lcula•tion to the amalysis of a• solar neutron event observed •t Mount Norikur• Cosmic Racy Observa•tory on June 4, 1991, it is possible to interpret the event a•s 7 ra•ys amd neutrons halving been produced impulsively a•t the time of the sola•r fl•re. The event observed Jungfra•ujoch on June 3, 1982 c•n be expladned simila•rly.