As of this writing, the C&H page [3.] has pointers to neutron monitor data
at the University of Chicago; IMP, Voyager, and WIND plasma data at MIT;
particle data from all four SAMPEX experiments furnished by the
University of Maryland and co-investigators; cosmic ray particle data
from the Voyager Cosmic Ray Science team;
a variety of particle, field, and plasma wave data in
the Planetary Data System, and IMP8 and ISEE3 solar wind and magnetic field
data at UCLA.