a. The more localized departures in the Earth's field from the values that would be predicted if the field were to originate with a single magnet oriented along the magnetic axis. These have maximums as great as 10,000 gamma, which is about a third the total intensity at the equator, and extend over areas as large as a million square miles. The locations of such features do not change with time as do anomalies associated with secular variation. Dobrin
b. The departure of a measured quantity from an expected or theoretical value on a scale larger than the most rapid spatial variations of the measured quantity; typically variations over tens to hundreds of kilometers.
Source: Dictionary of Mining, Mineral, and Related Terms












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