--------------------------------------------------------- NSSDC Master Catalog Display Experiment --------------------------------------------------------- Low-Energy Charged Particles (LECP) NSSDC ID: 77-084A-07 Mission Name: Voyager 1 Principal Investigator: Krimigis ------------------- Experiment mass: 7.50 kg Average experiment power: 3.80 W ------------------- Description This experiment was designed to study energetic particles in both planetary and interplanetary environments. In the planetary mode, particle sensing occurred with six different solid-state, totally depleted, surface-barrier type detectors. Both coincidence and singles count data were available from two of the detectors. By looking out at a shallow angle from behind the sun shield, measurements were made in regions where particle fluxes were so high as to saturate low-energy detectors. A current mode option was also available for high flux environments. In the interplanetary mode the experiment was equipped with a particle telescope which had solid-state detectors ranging from 2-2450 micrometers in thickness. The telescope consisted of two multi-dE/dx x E systems placed back to back in order to use a common all solid-state active anticoincidence shield. The telescope allowed the identification of protons, alpha particles, and heavier nuclei (Z from 3 to 26) in the range from 0.05 to 30 MeV. The combined dynamic range of all the instruments extended from approximately 1.E-5 to greater than 1.E12 particles/(sq cm-s-sr). The energy range covered extended from approximately 10 keV to greater than 11 MeV for electrons and from approximately 15 keV to greater than or equal to 150 MeV for protons and heavier ions. A stepping motor rotated the array of detectors through eight discrete sectors in 45-deg increments, thus allowing a 360-deg scan. For a description of the experiment see Space Science Reviews, 1977, v. 21, pp. 329-354. ------------------- Discipline(s) Planetary Science/Fields and Particles Space Physics/Heliospheric Studies --------------------------------------------------------- NSSDC Master Catalog Display Experiment Personnel --------------------------------------------------------- Low-Energy Charged Particles (LECP) NSSDC ID: 77-084A-07 Principal Investigator Dr. Stamatios M. Krimigis Chief Scientist, Space Department Applied Physics Laboratory Johns Hopkins University Johns Hopkins Road Laurel, MD 20723-6099 Electronic Mail TOM_KRIMIGIS@SPACEMAIL.JHUAPL.EDAPLSP::KRIMIGIS (INTERNET) APLSP::KRIMIGIS (NSI/DECNET) ----- Co-Investigator Dr. Louis J. Lanzerotti AT&T Bell Laboratories 600 Mountain Avenue Room 1E-439 Murray Hill, NJ 07974-0636 Electronic Mail LJL@PHYSICS.ATT.COM (INTERNET) [L.LANZEROTTI/OMNET]MAIL (OMNET) ----- Dr. Charles Y. Fan Department of Physics University of Arizona Tucson, AZ 85721 ----- Dr. William Ian Axford Max-Planck-Institut fur Aeronomie Postfach 20 37191 Katlenburg Germany Electronic Mail ECD1::29024::KOCH (NSI/DECNET) ----- Prof. Thomas P. Armstrong Department of Physics and Astronomy University of Kansas Lawrence, KS 66045-2151 Electronic Mail ARMSTRONG@KUHUB.CC.UKANS.EDU (BITNET) KUPHSX::ARMSTRONG (NSI/DECNET) ----- Prof. George Gloeckler Department of Physics and Astronomy Room 3203 University of Maryland College Park, MD 20742-4111 Electronic Mail GLOECKLER@UMDSP.DNET.NASA.GOV (INTERNET) UMDSP::GLOECKLER (NSI/DECNET) ----- Dr. Carl O. Bostrom Applied Physics Laboratory Johns Hopkins University Johns Hopkins Road Laurel, MD 20723-6099 ----- Dr. Edwin P. Keath Applied Physics Laboratory Johns Hopkins University Johns Hopkins Road Laurel, MD 20723-6099 ----- NSSDC Contact Dr. Edwin V. Bell, II Hughes STX Corporation Suite 400 7701 Greenbelt Road Greenbelt, MD 20770 Electronic Mail BELL@NSSDC (BITNET) BELL@NSSDC.GSFC.NASA.GOV (INTERNET) NSSDCA::BELL (NSI/DECNET) ----- --------------------------------------------------------- NSSDC Master Catalog Display Experiment Selected References --------------------------------------------------------- Low-Energy Charged Particles (LECP) NSSDC ID: 77-084A-07 1. Armstrong, T. P., Paonessa, M. T., Bell, E. V., II, and Krimigis, S. M., Voyager observations of Saturnian ion and electron phase space densities, J. Geophys. Res., 88, No. A11, 8893-8904, Nov. 1983. 2. Armstrong, T. P., Paonessa, M. T., Brandon, S. T., Krimigis, S. M., and Lanzerotti, L. J., Low-energy charged particle observations in the 5-20 RJ region of the Jovian magnetosphere, J. Geophys. Res., 86, No. A10, 8343-8356, Sept. 1981. 3. Krimigis, S. M., Armstrong, T. P., Axford, W. I., Bostrom, C. O., Fan, C. Y., Gloeckler, G., and Lanzerotti, L. J., The low energy charged particle (LECP) experiment on the Voyager spacecraft, Space Sci. Rev., 21, No. 3, 329-354, Dec. 1977. 4. Krimigis, S. M., Carbary, J. F., Keath, E. P., Armstrong, T. P., Lanzerotti, L. J., and Gloeckler, G., General characteristics of hot plasma and energetic particles in the Saturnian magnetosphere: Results from the Voyager spacecraft, J. Geophys. Res., 88, No. A11, 8871-8892, Nov. 1983. 5. Krimigis, S. M., Carbary, J. F., Keath, E. P., Bostrom, C. O., Axford, W. I., Gloeckler, G., Lanzerotti, L. J., and Armstrong, T. P., Characteristics of the hot plasma in the Jovian magnetosphere: Results from the Voyager spacecraft, J. Geophys. Res., 86, No. A10, 8227-8258, Sept. 1981. 6. Krimigis, S. M., and Roelof, E. C., Low-energy particle population, In--Physics of the Jovian Magnetosphere, edited by A. J. Dessler, pp. 106--156, Cambridge U. Press, Cambridge, UK, 1983. 7. Zwickl, R. D., Krimigis, S. M., Armstrong, T. P., Carbary, J. F., Keath, E. P., Hamilton, D. C., and Gloeckler, G., Energetic particle events of Jovian origin observed by Voyager 1 and 2 in interplanetary space, J. Geophys. Res., 86, No. A10, 8125-8140, Sept. 1981. --------------------------------------------------------------------------- For questions about this experiment, please contact: Dr. Edwin V. Bell, II, bell@nssdc.gsfc.nasa.gov 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: 1995-09-07 Output Generated: 1997-01-16 Programming by: E. V. Bell, II