Magnetometer positions on the ground are followed along magnetic dipole field lines to the near-Earth boundary of the magnetosphere model region (usually at 2.5 to 3.7 R
distance) and then traced along magnetic field line in the MHD model solution to the selected cut plane in the magnetosphere.
The determination of foot points in the magnetosphere was corrected on June 24, 2020. All visualizations that used this feature before this note was posted on that date need to be redone.