Temporal changes in the earth's magnetic field occur in the frequency band of millihertz to a few Hertz. Amplitudes of variations above 0.1 Hz are usually much smaller than 1 nT, changes of 50-100 nT over periods of a few hours are not uncommon.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not currently have access to this article.