This directory consists of annual subdirectories containing daily files of 20-sec particle count rate data from the JHU/APL CPME and EPE experiments. Merged into each record are IMP 8 magnetic field and MIT plasma parameters. Each such annual subdirectory also contains a subdirectory of daily attribute files. The content and format of each 20-s record, plus links to further descriptive material, are given at http://spdf.gsfc.nasa.gov/imp8/imp8_merged.html Brief descriptions of this data set and its source spacecraft and experiments are in the NSSDC information files at http://nssdc.gsfc.nasa.gov/database/MasterCatalog?ds=73-078A-08J Note that the data set is gzipped. Gzip is discussed at http://www.gzip.org/, which provides software for some platforms. For PC's, MACs, Linux and Solaris, software ("Stuffit Expander") is available free from http://stuffit.com/ ----------------------------------------------------------------- Related data and directories: SPDF Data and Orbits Services -------------- SPDF Contact: Natalia Papitashvili , Please acknowledge NASA's Space Physics Data Facility for data usage. Authorizing NASA Official: Dr. R.E. McGuire, Head, SPDF, NASA Goddard Space Flight Center 301-286-7794, e-mail: Robert.E.McGuire@nasa.gov -----------------------------------------------------------------------