2.0.0 spase://SMWG/Instrument/DoubleStar1/HEPD HEPD (High Energy Proton Detector) 2019-05-05T12:34:56Z HEPD (High Energy Proton Detector) detects energetic protons in the magnetosphere and solar wind. spase://SMWG/Person/UNKNOWN GeneralContact NSSDC's Master Catalog https://nssdc.gsfc.nasa.gov/nmc/experiment/display.action?id=2003-061A&ex=7 Information about the HEPD (High Energy Proton Detector) experiment on the Double Star 1 mission. EnergeticParticleInstrument HEPD (High Energy Proton Detector) on Double Star 1 spase://SMWG/Observatory/DoubleStar1