This program is used by the National Space Science Data Center's Satellite Situation Center (SSC) for magnetic field-line tracing. The main geomagnetic field is represented by a spherical harmonics model (IGRF 65 or 75) and the external field by the Mead-Fairfield model. Required input information includes time, year, altitude where trace should stop, latitude, longitude, and altitude where trace should start (e.g., satellite location). TRAJLST is adopted to the special needs of the SSC. The source code is, unfortunately, poorly documented, which may hinder use of the program for other applications.
Availability: On tape (NSSDC ID #PG-18B)
NASA Official: Dr. Robert McGuire, Head of the Space Physics Data Facility