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IEVref: | 705-07-87 | ID: | |

Language: | en | Status: Standard | |

Term: | twelve-month running-mean sunspot number | ||

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Symbol: | R_{12}
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Definition: | the mean value of the international relative sunspot number for the month n obtained by the following equation: $R}_{12}=\frac{1}{12}\frac{{R}_{n-6}+{R}_{n+6}}{2}+{\displaystyle \sum _{k}{R}_{k}$
for
where | ||

Publication date: | 1995-09 | ||

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Internal notes: | 2017-06-02: Cleanup - Remove Attached Image 705-07-87.gif 2017-08-30: Attempt to correct the nesting of the maths tags (unclosed <mrow> leading to problems). LMO | ||

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$R}_{12}=\frac{1}{12}\frac{{R}_{n-6}+{R}_{n+6}}{2}+{\displaystyle \sum _{k}{R}_{k}$

for *k* = *n* − 5, *n* − 4, ..., *n*, ..., *n* + 5

where *R*_{k} is the mean international relative sunspot number for the *k*th month