smoothed sunspot number

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Term: smoothed sunspot number
Definition:

An average of 13 monthly RI numbers, centered on the month of concern. The 1st and 13th months are given a weight of  0.5.
NOAA SWPC SpWx Glossary Planetary Astrophysics Heliophysics
Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan
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https://n2t.net/ark:/99152/h9995