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IRBEM LIB Update

IRBEM LIB Update. Paul O’Brien. What is IRBEM?. IRBEM-LIB is open source, shared development Started as ONERA-DESP LIB as a convenient tool for computing L* Includes many magnetic field models Includes routines for field line and drift shell tracing Coordinate transforms

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IRBEM LIB Update

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  1. IRBEM LIB Update Paul O’Brien

  2. What is IRBEM? • IRBEM-LIB is open source, shared development • Started as ONERA-DESP LIB as a convenient tool for computing L* • Includes many magnetic field models • Includes routines for field line and drift shell tracing • Coordinate transforms • Radiation specification models • Neutral atmosphere • Orbit propagator • Accessible from IDL, Matlab, and Excel via DLL • Mainly Fortran, some “extras” in C • As of release 4.3, the library is now known as IRBEM LIB • IRBEM = International Radiation Belt Model • Sponsored by COSPAR/PRBEM • File names haven’t changed (reverse compatibility)

  3. Rename and Move to Sourceforge • IRBEM LIB is hosted on sourceforge at irbem.sourceforge.net • Allows multiple developers to stay “synched up” in the working directory /trunk/ (Bourdarie, O’Brien, Guild, Friedel, Roth, Boscher, …) • Keeps track of all changes with subversion version control tool (and also CVS, I think) • Formal releases are in /tags/, but it’s OK to use the working copy—it “works” it’s just being improved all the time. • Fora (forums?) for questions and discussion, problem tracking, feature requests, etc. • Covered by Lesser Gnu Public License

  4. Multi-Platform • Successfully compiled on Win32, Linux64, and Solaris64 • IDL & Matlab wrappers work on Win32 and Linux64 – use the “working” copy in /trunk/ • Mac OS-X not 100% - can use from Fortran but DLL does not appear to work with IDL, don’t know about Matlab. Need Mac Expert!

  5. New Enviornment Models • Neutral Atmosphere: • MSIS86, MSISE90, NRLMSIS00 • Radiation Belts: • AE8/AP8 • CRRES-ELE, CRRES-PRO • IGE (POLE) • MEO-GNSS (GPS and GALILEO)

  6. New Field Tracing Routines • MAKE_LSTAR routines support request for Phi rather than L* • Fast L* (LANDI2LSTAR, LANDI2LSTAR_SHELL_SPLITTING EMPRICALLSTAR) • Only for Olson-Pfitzer Quiet • New more “careful” drift shell (DRIFT_BOUNCE_ORBIT) • New tracing to foot point: • FIND_FOOT_POINT, TRACE_FIELD_LINE_TOWARD_EARTH • Identify Hemisphere (GET_HEMI) • Convert L* to Phi LSTAR_PHI

  7. Extras • We have created the /extras folder to hold tools that aren’t part of the onera_desp_lib DLL • If you have an IRBEM-related tool you’d like to make available, consider putting it in the extras folder • A neural network library • C with GSL, • trains, evaluates neural networks • An inversion library • C with GSL • spectral inversion • converting omnidirectional fluxes to unidirectional fluxes using statistical models • Var2cdf • IDL and Matlab code • Share variables and save sets between Matlab and IDL via CDF • Works most of the time ;)

  8. Future Plans • More work on Fast L* • Minor tweaks to LANDI2LSTAR_SHELL_SPLITTING • Neural network fast L*? • Faster IGRF (Pfitzer’s INVARM) • More models from ONERA • IRI and Shieldose2 could be added fairly easily • What do you want/need? • We could really use a motivated person to update and maintain our sourceforge web pages

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