Fast MagEphem

Note: We apologize for the inconvenience, but this tool is temporarily offline. We will provide updates once it is back in service.

About

Fast MagEphem quickly computes adiabatic invariants (magnetic ephemeris) for widely-used magnetic field models. It uses a fast version of the IGRF internal field that truncates the internal field multipole expansion to an order appropriate for the altitude of the query point. It also computes invariants for multiple starting pitch angles simultaneously, eliminating the need for multiple integrals on the same field line. Finally, it employs neural networks to compute the drift invariant parameters (L*, Phi, hmin) from the field line quantities without having to actually trace the entire drift orbit. Performance can reach up to 30 times faster on field line tracing and 1000 times faster on drift shell tracing.

Note: the tool is developed by the model developers and hosted at the CCMC. It is not a CCMC developed tool. See Tool Developer Contact if you have any question or feedback on the tool.

Latest News

• Jan 2026: Fast MagEphem is taken offline from the CCMC until further notice.
• April 2025: Fast MagEphem is available at the CCMC

Contact

For questions and comments on the tool, please contact

• Yihua Zheng (CCMC Web App/Tool Host)
• Paul O'Brien (Tool Contact)