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Cosmic-Ray Anisotropy

NSSDCA ID: 1967-051A-05

Mission Name: IMP-F
Principal Investigator:Dr. Kenneth G. McCracken


This experiment was designed to study solar particle anisotropy and its variation with time. A telescope, consisting of three aligned detectors -- (A) solid state, (B) plastic scintillator, and (C) CsI scintillator-- and a plastic scintillator anticoincidence shield (D), were used to measure protons from 0.8 to 7.0 MeV -- counts in (A) but not in (B)-- and from 35 to 110 MeV -- coincident counts in (B), measuring dE/dx, and (C), measuring total energy, but not in (D). Pulse-height analysis yielded six-point spectra within each of these two energy intervals. Protons from 7 to 55 MeV -- counts in (A) and (B)-- were also recorded without spectral information. In addition, a proportional counter provided directional measurements of X rays with energies above 2 keV and electrons above 70 keV. Counts in each particle-counting mode were obtained in each of eight octants in the ecliptic plane. X-ray counts were obtained in the solar octant. A complete set of count rates and spectral data was obtained every 81.9 s. For a more detailed description, see Solar Physics, v. 17, p. 218, 1971.

Alternate Names

  • IMP-F/Cosmic-RayAnisotropy


  • 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. William C. BartleyOther InvestigatorDepartment of Energy Headquarters
Prof. Udipi Ramachandra RaoOther InvestigatorISRO Satellite
Dr. Kenneth G. McCrackenPrincipal InvestigatorCommonwealth Scientific and Industrial Research Orqanisation
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