M.b. Cattaneo et al., Observation of interplanetary shocks on august 4, 1972, Laboratorio di Ricerca e Tecnologia per lo Studio del Plasma nello Spazio , LPS-73(14), 1973, pp. 1-16
In this report we describe plasma and magnetic field observations performed by the European satellite HEOS during a series of large interplanetary shocks, which overtook the spacecraft on August 4, 1972.