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Solar Wind Ion Composition

NSSDCA ID: 1972-073A-12

Mission Name: IMP-H
Principal Investigator:Dr. Keith W. Ogilvie


An electrostatic analyzer and Wien-type velocity selector were used to gain exploratory data on heavy ion composition in the solar wind. The bulk velocities of 4 He++, 4 He+, 3 He++, and O (isotopes indistinguishable) ions in all ionization states were separately studied. During 30 successive spacecraft spin periods, ions of a given species were studied in 30 logarithmically equispaced bulk velocity channels from 200 to 600 km/s. A complete set of measurements required about 10 min and consisted of 30 one-step sequences for 4 He++ ions and five 30-step sequences for each of the three other species. This was an experimental detector, and the data were considered not useful.

Alternate Names

  • IMP-H/SolarWindIonComposition

Funding Agency

  • NASA-Office of Space Science (United States)


  • Space Physics: Magnetospheric Studies
  • Space Physics: Heliospheric Studies

Additional Information

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



NameRoleOriginal AffiliationE-mail
Dr. Keith W. OgilviePrincipal InvestigatorNASA Goddard Space Flight
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