This directory contains Earth magnetic field data

IGRF11*.xml
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- Global magnetic fields from IGRF11 model (created from Fortran code provided on IGRF-11 website: http://www.ngdc.noaa.gov/IAGA/vmod/igrf.html)
- naming convention: IGRF11_[YYYY]_[ResZ]-[ResLat]-[ResLon].B_[comp].xml
  - YYYY....the year
  - ResZ....the altitude resolution (in km)
  - ResLat..the resolution in latitude (in deg)
  - ResLon..the resolution in longitude (in deg)
  - comp....the directional component of the field (v/u/w for north/east/up)

- originally given over altitude, (globally fixed) conversion to pressure done assuming hydrostatic equilibrium with constants (gravity, gas constant, mean molecular weight) chosen as set or suggested by ARTS. resulting p_grid and z_field stored in IGRF11_[ResZ].B.z.xml (as true 3D with lat=[-90,90] and lon=[0,360]).

- for more on IGRF11 see:
International Geomagnetic Reference Field: the eleventh generation. International Association of Geomagnetism and Aeronomy, Working Group V-MOD. Participating members: C. C. Finlay, S. Maus, C. D. Beggan, T. N. Bondar, A. Chambodut, T. A. Chernova, A. Chulliat, V. P. Golovkov, B. Hamilton, M. Hamoudi, R. Holme, G. Hulot, W. Kuang, B. Langlais, V. Lesur, F. J. Lowes, H. Luhr, S. Macmillan, M. Mandea, S. McLean, C. Manoj, M. Menvielle, I. Michaelis, N. Olsen, J. Rauberg, M. Rother, T. J. Sabaka, A. Tangborn, L. Toffner-Clausen, E. Thebault, A. W. P. Thomson, I. Wardinski Z. Wei, T. I. Zvereva. Geophys. J. Int., Vol 183, Issue 3, pp 1216-1230, December 2010. DOI: 10.1111/j.1365-246X.2010.04804.x.