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Space Weather Prediction Center

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SWPC HOME -> Product Subscription Growth

Image showing the growth of SWPC's PSS customer base as a function of solar activity

This graph shows both the progression of the solar cycle using smoothed sunspot number as well as the total number of active subscribers for SWPC's Product Subscription Service. Please note that the most recent smoothed sunspot numbers are estimates only since the true smoothed sunspot number can only be derived several months after the fact.

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Page last modified: November 5, 2007


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