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Solar Plasma Faraday Cup

NSSDCA ID: 1973-078A-02

Mission Name: IMP-J
Principal Investigator:Dr. Alan J. Lazarus


A modulated split-collector Faraday cup, perpendicular to the spacecraft spin axis, was used to study the directional intensity of positive ions and electrons in the solar wind, transition region, and magnetotail. Electrons were studied in eight logarithmically equispaced energy channels between 17 eV and 7 keV. Positive ions were studied in eight channels between 50 eV and 7 keV. A spectrum was obtained every eight spacecraft revolutions. Angular information was obtained in either 15 equally spaced intervals during a 360-deg revolution of the satellite or in 15 angular segments centered more closely about the spacecraft-sun line. Operations were continuing as of August 2005.

Alternate Names

  • IMP-J/SolarPlasmaFaradayCup
  • Measurement of Solar Plasma

Funding Agency

  • NASA-Office of Space Science (United States)


  • Space Physics: Heliospheric Studies

Additional Information

Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office



NameRoleOriginal AffiliationE-mail
Dr. Karolen I. PaularenaCo-InvestigatorMassachusetts Institute of Technology
Dr. Ervin F. LyonOther InvestigatorMassachusetts Institute of Technology
Dr. Joseph H. BinsackOther InvestigatorMassachusetts Institute of
Dr. Karolen I. PaularenaOther InvestigatorMassachusetts Institute of Technology
Dr. Alan J. LazarusPrincipal InvestigatorMassachusetts Institute of Technology
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