Penetration of Solar Cosmic Rays into the Earth's Magnetosphere

Results of the comparative analysis of the dynamics of SCR fluxes with energies of 1-100 MeV in the interplanetary environment according to the data of the ACE and Wind spacecraft and within the Earth's magnetosphere according to the data of the GOES�15 and ElectroL satellites in the region of geostationary orbits, and POES�19 and MeteorM1 in the region of polar caps during two increases in SCR of January 19- 31, 2012, are presented. It is shown that the decrease in the efficiency of SCR penetration into the Earth's magnetosphere in the region of the orbits under study on January 28, 2012, is related to the passage of the Earth's magnetosphere through the interplanetary environment structure with a quasiradial interplanetary magnetic field and a small pressure of the solar wind.