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Next: Additional data required for GPS-based corrections
Up: Global data used in ionospheric calibration
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Since the rotation measure is determined by both electron density and the
magnetic field strength, Ionosphere needs to know the Earth magnetic field.
The current version relies on a FORTRAN routine within PIM, which in turn uses
the IGRF model. Because IGRF is already incorporated into the AIPS++ Measures
system (see, e.g., MVEarthMagnetic, EarthMagneticMachine), I plan to
implement a C++ version of this routine in the near future.
Next: Additional data required for GPS-based corrections
Up: Global data used in ionospheric calibration
Previous: Geophysical data
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2004-08-28
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