NASA Logo, National Aeronautics and Space Administration
NASA Space Science Data Coordinated Archive Header

Energetic Electron and Proton Detector

NSSDCA ID: 1974-097A-10

Mission Name: Helios-A
Principal Investigator:Dr. Ehrhard Keppler


The objective of the experiment (E8) was to study the origin and the distribution mechanism of low-energy electrons and protons. The instrument, a magnetic spectrometer, consisted of six semiconductor detectors with the field of view in the plane of the ecliptic. Species separation was achieved by an inhomogeneous magnetic field oriented perpendicular to the particle path. Four electron and two proton detectors measured electrons from 20 to 1000 keV and protons from 80 to 1000 keV. The proton measurements were made with a two-detector telescope employing coincidence and anticoincidence logic. Both particle species were measured in 16 energy channels through pulse-height analysis. For further information see pp. 261-263 of Raumfahrtforschung, v. 19, n. 5, 1975.

Alternate Names

  • Energetic Electron Detector
  • Helios-A/EnergeticElectronandProtonDetector

Funding Agency

  • Unknown (Federal Republic of Germany)


  • Space Physics: Heliospheric Studies

Additional Information

Questions and comments about this experiment can be directed to: Dr. H. Kent Hills



NameRoleOriginal AffiliationE-mail
Dr. Berend WilkenOther InvestigatorMax-Planck-Institut fur Aeronomie
Dr. Donald J. WilliamsOther InvestigatorApplied Physics
Dr. Ehrhard KepplerPrincipal InvestigatorMax-Planck-Institut fur
[] NASA Logo -