Magnetic Solar Daily Variation

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Magnetic Solar Daily Variation

(symbol S) 

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A periodic variation of the earth's magnetic field that is in phase with solar (local) time.
The primary source of this variation is the ionizing effect of solar electromagnetic radiation on the atmosphere coupled with the earth's rotation. The amplitude of this variation changes with the seasons and the sunspot cycle. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use