COHOWeb at the Space Physics Data Facility (SPDF)
Hourly-averaged deep space magnetic field, plasma, and ephemerides. This web service includes data from  missions including Helios1, Helios2, OMNI_M, Pioneer10, Pioneer11, Pioneer Venus, Stereo-A, Stereo-B, Ulysses, Voyager1, Voyager2, Mariner2, Pioneer6, Pioneer7. The Space Physics Data Facility (SPDF) is the archive …