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What wavelengths?

The article "Icy Heat: Satellites look at heat flow through Antarctica's crust" (SN: 6/11/05, p. 373) refers to the Earth's magnetic field only at very long wavelengths. In over 70 years' exposure to science, I have never heard of our magnetic field having wavelengths. Please elaborate.

KENNETH E. STONE, CHERRYVALE, KAN.

Looking at Earth's magnetic field at long wavelengths is analogous to looking at a picture in low resolution, says Catherine Fox Maule of the Center for Planetary Science in Copenhagen. Small variations in the field due to local anomalies in the crust disappear, leaving only regional variations, which scientists can interpret as differences in heat flow through the crust. --S. Perkins
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Title Annotation:LETTERS
Author:Perkins, S.
Publication:Science News
Article Type:Letter to the Editor
Date:Aug 6, 2005
Words:114
Previous Article:Empty threat?
Next Article:Corrections.


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