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sunspot number

noun, Astronomy
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for sunspot number
  • The long sunspot number record helps to characterize the solar cycle.
  • The yellow curve plots the change in solar sunspot number.
  • As the sunspot number increases, the number of days that have geomagnetic storms also rises.

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Word Value for sunspot

9
12
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