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The LFM is a global MHD model written by John Lyon, Joel Fedder and Clark Mobarry. It is primarily used to better understand Earth's Magnetosphere. The LFM can be coupled with a variety of models to aide in understanding of the physical processes in Geospace , such as:

  • Magnetosphere Ionosphere Coupler/Solver (MIX)
  • Thermosphere Ionosphere Electrodynamic General Circulation Model (TIEGCM)
  • Rice Convection Model (RCM)
    The coupled combination of models is called the LTR (LFM-TIEGCM-RCM).

The documentation on this wiki contains limited scientific descriptions of the models.  It is intended as a guide to compile & execute the code(s) and documents some of the post-processing tools which have been developed for LTR.


The LTR models and documentation are constantly evolving. This wiki documents the latest release. In some cases, this includes documentation for unreleased/upcoming features. You should sign up to the LTR-announce mailing list and make sure you're using the latest release. You can find a list of upcoming features via the LTR roadmap.

Scientific Documentation

  • The October-November 2004 Journal of Atmospheric and Solar-Terrestrial Physics special issue: Towards an Integrated Model of the Space Weather System (i.e. Lyon 2004).
  • The publications and presentations listed at the BU CISM website
  • LFM Field Aligned Current calculation - Notes on the LFM inner boundary conditions. Gives insight into the calculation of

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    , which is sent to MIX.

  • 2010 Merkin, & Lyon Effects of the low-latitude ionospheric boundary condition on the global magnetosphere
  • 2015 Wiltberger et al. LFM-RCM Coupling paper


This material is based upon work supported by CISM which is funded by the STC Program of the National Science Foundation under Agreement Number ATM-0120950. The National Center for Atmospheric Research is sponsored by the National Science Foundation.

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