local magnetic disturbance

local magnetic disturbance

[′lō·kəl mag′ned·ik di′stər·bəns]
(geophysics)
An anomaly of the magnetic field of the earth, extending over a relatively small area, due to local magnetic influences. Also known as local attraction.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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To reduce local magnetic disturbances, place the magnetometer in a box well separated from the power supply and pen recorder (the motor of the recorder could produce some nasty feedback).