The recovery of the cosmic ray flux from maximum solar modulation at IMP-8 (1 AU) and at Pioneer (R 30 AU)

In the period 1980-84, observations of relativistic and low energy (30 E 70 MeV/n) cosmic ray nuclei from Pioneer 10 in the outer heliosphere and from IMP-8 at AU show that increases as well as decreases in intensity propagate outward at velocities equal to or greater than the average solar wind velocity.