The numerical file description

  • Let consider as an example the numerical file with name ap9612ut.cng. This file contains the information about AURORAL probe and POLAR conjunctions during December 1996.
  • The Tsyganenko 87 (KP = 2) + IGRF magnetic field model are used during magnetospheric mapping.
  • Stop trace altitude (km) 110.
  • The predicted conjunctions correspond to the less then 5 deg angular distance of the footprints.
  • For selected time intervals (Universal time) the geographical coordinates of POLAR and AURORAL probe magnetospheric mapping are shown with 10 min step. For each time two lines (the first for POLAR, the second for AURORAL) contain the coordinates as follows: 
  • UTYYMMDD HHMMSS - Universal time

  • AngDs           - the footprints angular distance,

  • R      (RE)     - the satellite geocentric distance,

  • GLAT (deg)      - the satellite geographical latitude, 

  • GLON (deg)      - the satellite geographical longitude, 

  • FNGLAT (deg)    - the geographical latitude of the footprint in the Northern heisphere, 

  • FNGLON (deg)    - the geographical longitude of the footprint in the Northern heisphere,  

  • REG             - the region, corresponding to the satellite position  

  • INVLAT (deg)    - the invariant (corrected) geomagnetic latitude,

  • FNMLT  (h)      - the corrected geomagnetic local time,

  • ARClen (Re)     - the length of the magnetic field line (between satellite and footprint).

  • REG             - the region, corresponding to the footprint position

    • The region designations used in the numerical files.