Geomagnetism

Here is a gathering of ideas, in order to produce geomagnetic modules or scripts to GRASS

Interesting Links

The California Soil Resource Lab has some quite interesting information for production of a Detailed Magnetic Declination map.

They also cite the NOAA website, which has the IGRF and WMM computer models available for download (registration necessary).

The USGS has a collection of software, however it dates of 1997. This Open-File Report (97-725) is named Potential-Field Geophysical Software for the PC, version 2.2 and supersedes Open-File Report 95-77, from 1995, A bibliography of some geophysical computer programs, databases, and maps from the U.S. Geological Survey, 1971-1994.

The Colorado School of Mines also has software libraries.

The Brazilian National Observatory (ON) also had its own geomagnetic model, called ELEMAG, which agrees with the IGRF, but is calibrated to work only in Brazil. I (Pmarc) however, have not been able to find it on their website, on the other hand, Google was able to find some versions online.

Wishlist

• Module capable of computing the magnetic field (all 7 components) over a location, for a given date or range of dates. It seems to me (Pmarc) that the most appropriate output would be a vector map. The starting point could be the IGRF model provided by NOAA (link above)