< ftp://nssdc.gsfc.nasa.gov/miscellaneous/orbits/imp8/00readme.txt> This directory carries two files of IMP 8 s/c related data. The file "imp8.solarwind" contains the times when IMP 8 was(/will be) in the solar wind beyond the (model) Earth's bow shock. The file "imp8.12ut" contains the position of IMP 8 (in GSE and GSM cartesian coordinates) at 12:00 UT on every day since IMP's 1973 launch. Note that actual IMP 8 bow shock crossings through the June 10, 2000, magnetometer failure are available from http://ftpbrowser.gsfc.nasa.gov/bowshock.html