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Modulation of galactic cosmic ray intensity is governed by several mechanismsincluding diffusion, convection, adiabatic energy losses and drift. Relativeroles of these factors change in the course of an 11-year solar cycle. That canresult in the changes in the energy dependence of the 11-year cosmic raymodulation. The minimum between the solar cycles 23 and 24 was extremely deepand long-lasting which led to the record high cosmic ray fluxes low-energyparticles dominating. This was a signature of unusually soft energy spectrum ofthe cosmic rays. In this work we examine the energy dependence of the 11-yearmodulation during the last three solar cycles and argue that a soft energyspectrum was observed in the minimum of each cycle however only for particlesbelow of energy around 10 GeV. From mid 1980s the energy dependence of cosmicrays became softer from minimum to minimum of solar activity. The work is basedon the cosmic ray data of the spacecraft, balloon-borne and the ground-basedobservations.

Temporal and energy behavior of cosmic ray fluxes in the periods of low solar activity