--------------------------------------------------------- NSSDC Master Catalog Display Experiment --------------------------------------------------------- Charged Particle Composition NSSDC ID: 73-019A-02 Mission Name: Pioneer 11 Principal Investigator: Simpson Description This experiment used two telescopes to measure the composition and energy spectra of solar (and galactic) particles above about 0.5 MeV/nucleon. The main telescope consisted of five collinear elements (three solid state, one CsI, and one sapphire Cerenkov) surrounded by a plastic anticoincidence shield. The telescope had a 60-deg, full-angle acceptance cone with its axis approximately normal to the spacecraft spin axis, permitting 8-sectored information on particle arrival direction. Four elements of the main telescope were pulse-height analyzed, and low- and high-gain modes could be selected by command to permit resolution of the elements H through Ni or of electrons and the isotopes of H, He, and light nuclei. A selection-priority scheme was included to permit sampling of less abundant particle species under normal and solar-flare conditions. The low-energy telescope was essentially a two-element, shielded, solid-state detector with a 70-deg, full-angle acceptance cone. The first element was pulse-height analyzed, and data were recorded by sectors. Data include the interplanetary region. ------------------- Discipline(s) Planetary Science/Fields and Particles Space Physics/Heliospheric Studies --------------------------------------------------------- NSSDC Master Catalog Display Experiment Personnel --------------------------------------------------------- Charged Particle Composition NSSDC ID: 73-019A-02 Principal Investigator Prof. John A. Simpson LASR University of Chicago 933 East 56th Street Chicago, IL 60637 Electronic Mail SIMPSON@ODYSSEUS.UCHICAGO.EDU (INTERNET) LASR::SIMPSON (NSI/DECNET) ----- Other Investigator Mr. Anthony J. Tuzzolino LASR University of Chicago 933 East 56th Street Chicago, IL 60637 ----- Dr. J. J. O'Gallagher Address Unknown ----- NSSDC Contact Dr. John F. Cooper GSFC-Code 632 Electronic Mail JCOOPER@NSSDCA.GSFC.NASA.GOV (INTERNET) NCF::JCOOPER (NSI/DECNET) ----- --------------------------------------------------------------------------- For questions about this experiment, please contact: Dr. John F. Cooper, jcooper@nssdca.gsfc.nasa.gov, (301)286-1193 GSFC-Code 632 For questions about the NSSDC's information systems, please contact: Dr. James Thieman, thieman@nssdca.gsfc.nasa.gov, (301)286-9790 National Space Science Data Center, Code 633.2 NASA/Goddard Space Flight Center, Greenbelt, MD 20771 --------------------------------------------------------------------------- NASA Official: J. H. King, king@nssdca.gsfc.nasa.gov Last Updated: 1995-08-25 Output Generated: 1996-09-24 Programming by: E. V. Bell, II