Dedication: I dedicate this paper to two deceased colleagues who contributed valuable material to the present study; both were excellent, skilled, knowledgeable geophysicists: Robert Schnepfe (1933–1991) and Edward de Ridder (1939–2002).

Coordinator's comments: This article is an excellent synopsis of a very real problem—that of geologically derived “noise” contaminating a deeper signal. However, many designers of magnetic surveys would not agree with Gay's recommendation to fly higher above the ground to suppress the high frequency contamination. They would argue that it is better to sample the glacial signal accurately by flying low, and then to do one's best to eliminate...

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