sunspot number
noun
: an arbitrary numerical value that is used to describe the sun's spottedness, is the number of individual spots plus 10 times the number of disturbed regions, and depends upon the instrumental equipment and personal equation of the observer
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“Sunspot number.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sunspot%20number. Accessed 23 Nov. 2024.
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