IRBEM LIB Update

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IRBEM LIB Update

• Paul OBrien

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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 havent changed (reverse compatibility)

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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,
  OBrien, 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 its OK to use
  the working copyit works its just being
  improved all the time.
• Fora (forums?) for questions and discussion,
  problem tracking, feature requests, etc.
• Covered by Lesser Gnu Public License

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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, dont know
  about Matlab. Need Mac Expert!

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New Enviornment Models

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

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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

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Extras

• We have created the /extras folder to hold tools
  that arent part of the onera_desp_lib DLL
• If you have an IRBEM-related tool youd 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 )

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Future Plans

• More work on Fast L
• Minor tweaks to LANDI2LSTAR_SHELL_SPLITTING
• Neural network fast L?
• Faster IGRF (Pfitzers 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