IDL AACGM DLM is a Dynamic Link Module (DLM) for the Interactive Data Language (IDL) by Research Systems, Inc. The purpose of this library is to provide easy access to the AACGM library by R. J. Barnes, which is based on algorithms by K. Baker and S. Wing. I do not claim any rights to those routines. My only intellectual assets are in the interface itself. The interface allows calling of the AACGM functions from the IDL command line without any knowledge of the C language. All commands behave like native IDL procedures and are faster than the native IDL implementation of the library. Please send any comments or bug reports to

IDL AACGM DLM for Windows v5.1 (IDL >6.4) (includes Year 2010 coefficients)