This directory contains hourly averages of parameters for the interplanetary magnetic field, solar wind plasma, spacecraft trajectory coordinates and Proton fluxes. Original plasma data are at: https://spdf.gsfc.nasa.gov/pub/data/voyager/voyager1/plasma/hour/ and ftp://space.mit.edu/pub/plasma/vgr/v1/key/ ( full version) Data Description are given at "vy1mgd.txt" file ------------------------------------------------------------------ Related data and directories: SPDF Data and Orbits Services SPDF Contact: Natalia Papitashvili , Please acknowledge Space Physics Data Facility, and PI for data usage. Authorizing NASA Official: NASA Official: Robert Candey (Robert.M.Candey@nasa.gov), Head of the Space Physics Data Facility SPDF, NASA Goddard Space Flight Center ----------------------------------------------------------------------------------