Overview:
• HDGM improves geomagnetic referencing accuracy by accounting for regional crustal anomalies
• HDGM uncertainty (1 sigma):
– Predicted 114 nT, found 112 nT in total field
• IGRF uncertainty:
– predicted 141 nT, found 164 nT
– But measurements all in 2nd half of 5-year lifetime
• BGGM uncertainty:
– 136 nT, agrees with 130 nT of ISCWSA-2000
– New BGGM error tables may be too optimistic
• Overview of HDGM2011
• Comparison with IGRF, BGGM
• Validation against aeromagnetic and marine data
• Estimated model uncertainties
• Numbers are spherical harmonic degrees. The higher the degree, the better the resolution of the model
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Release and Validation of the High Definition Geomagnetic Model
Stefan Maus and Manoj Nair - NOAA/NGDC
Benny Poedjono - Schlumberger
Shola Okewunmi - Chevron