The j4track program is a stand-alone program that can be used to extract SSJ/4 data that are produced by the DMSP satellites. Table A.2 lists the available scripts that are available to plot the dirrerent measurements and derived values. It has been tested with DMSP F11 and F12 data from January and February 1995. Data that is generated in March 1995 follows a changed data format which is not sufficiently documented and can therefore not be used.
Table A.2: Programs and scripts to extract and plot DMSP SSJ/4 data
Usage: j4track [options] f [infile] [>data] [2>markers] f [file] - input filename l [min. lat.] [max. lat.] - latitude range L [min. lon.] [max. lon.] - longitude range t [start] [stop] - time range (in seconds of day) R - print record number T - print time P - print position and footprint on E-/F-layer E - print average electron energy and flux F - print channel energies and fluxes (19 lines) M [sec] - print marker info every [sec] seconds C - print conductivity estimates I - print ionization rate estimates All data is written to stdout, markers are written to stderr. A description of the fields in each line, is printed at the beginning and marked with a # as comment. Example: The output filenames are chosen so that the plot-scripts will work. The latitude and longitude range are for the Saskatoon SuperDARN radar. j4track f file.j4 l 60 80 L 240 290 T P E M 30 C I >j4.data 2>j4.label