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What does SD stand for?

SD stands for Solar Dynamics

This definition appears frequently

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We have 158 other meanings of SD in our Acronym Attic

Samples in periodicals archive:

Washington, Mar 12 ( ANI ): NASA's Solar Dynamics Observatory (SDO) entered its semi-annual eclipse season on March 2, 2013 - a period of three weeks when Earth blocks its view of the sun for a period of time each day.
In an article published in this month's Science, the agency said its Solar Dynamics Observatory recorded Comet C/2011 N3 nearing the sun and burning to nothing over a 20-minute span in July.