NCL is an interpreted programming language providing high level interactive access to the NCAR graphics package. This language has an easy to use interface to netCDF files, as well as other meta-data file formats. It has been developed at NCAR (in-house support is excellent), and is publicly available for free.

This is not a single application. Rather, users write their own NCL scripts (or customize example scripts) that read, process, and display tgcm model output. This method is preferred for user's who need to customize their output or processing according to their own needs. (Plotting fields on the magnetic grid is available.)