Decay of high-energy solar proton yield in the interplanetary space

The analysis of experimental data with the purpose of determining the delay of high-energy solar proton yield in the interplanetary space is presented. The measurements of the delay of energetic protons arrival at the Earth by neutron monitors and on the satellite give equal values of mean delay time (10-20 min). This value does not depend on the flare longitude for the western hemisphere of the Sun