Magnetic Disturbance Daily Variation

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Magnetic Disturbance Daily Variation

(symbol 

SD) </dt>
A periodic variation of the earth's magnetic field that is in phase with solar (local) time. It is the difference between the solar daily variation (or the disturbed-day solar daily variation) and the quiet-day solar daily variation. This variation is primarily an effect of enhanced electromagnetic radiation during increased solar activity. </dd>

References

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