Format for NSSDC-created IMP8/LANL Magnetotail-mode data set This data set was created at NSSDC by scanning microfilm frames containing rows/columns of numbers originally created on computer printout paper by Dr. Ed Hones at LANL, then passing the scanned images through an Optical Character Recognition package to produce ASCII files, then correcting the more readily findable errors made in the OCR process, and finally reorganizing the data to be more useful for computer-based applications. The process was initially run against three of the 54 microfilm reels constituting this 1973-1980 data set. The three reels were chosen to have sharper than average characters. The days for which data were OCR'd are evident from the listing of data files in this subdirectory. As of June, 2000, we were awaiting community interest before OCR'ing additional reels. Note that these data are mainly for magnetotail orbit phases, and are the only such IMP8/LANL magnetotail-instrument-mode data set. Starting with word 4, the format allows at least one blank space before the data value (e.g., I6 for seconds of day, whose maximum value is 86400). Index Format Word 1 I2 year 2 I2 month 3 I2 day 4 I6 seconds of day 5 A2 species code: e=electrons; p=protons 6 F6.2 density, cm**-3 7 I6 average energy, eV 8 F8.1 energy density, eV/cm**3 9 1X,1PE8.1 flux, 1/cm**2 sec (e.g., 4.47E+09) 10 F7.3 pressure anisotropy, Pmax/Pmin 11 I5 azimuth of pressure anisotropy, deg 12 I6 flow speed, km/s 13 I5 azimuth of flow vector, deg 14 F6.2 statistical uncertainty in word 6 15 F6.2 " " " 7 16 F6.2 " " " 8 17 F6.2 " " " 9 18 F6.2 " " " 10 19 I5 " " " 11 20 F6.2 " " " 12 21 I5 " " " 13 ------------------------------------------------------------------------ ----------------------------------------------------------------- Related data and directories: SPDF Data and Orbits Services NSSDC Master Catalog Please acknowledge NASA's National Space Science Data Center and Space Physics Data Facility, and the Principal Investigator Dr John Gosling 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 -----------------------------------------------------------------------