Magnetic terms in ISCWSA and OSWG MWD error models
- Declination (D)/magnetic azimuth with horizontal intensity (H) dependency = 2 terms (DEC, DBH), dD = √(DEC2 + (DBH/H)2)
- +1 term for inclination (I)/magnetic dip (MDI in +AX models only)
- +1 term for total intensity (F)/Btotal (MFI in +AX models only)
- = 4 terms
D error in northern polar region from 2-term model and 1-term model with value from look-up table
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H dependency for D error does not map auroral oval region accurately
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Values at high latitudes too high from 2-term model
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Range of colour scale spans all oil fields
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