Stringent selection criteria using Kp indices, local magnetic activity estimates, and visual intercomparisons, followed by a statistical screening procedure have enabled the production of preliminary scalar and vector component magnetic anomaly maps derived from Magsat data at northern high latitudes, in spite of frequent external field disturbances. Comparisons between the maps and with other magnetic maps and geological information confirm their general validity.
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Coles et al. (1982) studied this question.
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