... Along with the stable inner proton belt, temporal variations of the 1-15 MeV protons at L=2.5-3.5 have been reported, with intensity increases and decreases registered during and after strong magnetic storms. ... Our study presents experimental evidences that creation and destruction of solar proton belts in the inner magnetosphere may be produced by the fast shifts of the proton penetration boundary without additional acceleration and injection. ... Black line shows the 50-90 MeV proton profiles. ...