Bidirectional MeV/n ion intervals - Observations from the Goddard Space Flight Center instruments on the ISEE 3/ICE, IMP 8, Helios 1 and Helios 2 spacecraft

A search is made for intervals of bidirectional energetic ion streaming in approximately 1 MeV data from the instruments on ISEE 3/ICE, IMP 8 and Helios 1 and 2 during 1973 to 1989. The longest duration intervals are found around solar maximum, consistent with the expected association with coronal mass ejections. The ISEE 3/ICE intervals are associated with previously identified bidirectional 35-1000 keV ions and solar-wind electron heat fluxes, though additional bidirectional intervals are found.