OMNIWeb at the Space Physics Data Facility (SPDF)
Hourly-averaged near-Earth solar wind magnetic field and plasma, etc. The web services consists of OMNI data (spacecraft-interspersed, near-Earth solar wind data); spacecraft-specific data sets (near 1 AU, including near-Earth) including ACE, Geotail, IMP-8, IMP6&7, Wind, Explorer 33&35, Genesis, ISEE 3, Prognoz, …