pysatmagvect (pypi): Calculates geomagnetic unit vectors (field aligned, zonal, and meridional) and includes supporting routines for characterizing the motion of ionospheric plasma.
Keywords: coordinate-transformation|electric-fields|field-aligned|field-line-tracing|geomagnetic|magnetic-fields|meridional|multipole|multipole-vectors|nasa|plasma|plasma-physics|satellite|vector-basis|zonal