Monthly sunspot numbers

Time Interval: Monthly
Time Coverage: 1749 to Aug 2021
Update Status: Periodically updated

Get Data:

Sunspot: Standard PSL Format (What is standard format?)
Sunspot: Original

Source:
Data is from SIDC at their archive site.. This is version 1.0. There is an updated version available at their site.
References:

1. Please site "credit: SIDC, RWC Belgium, World Data Center for the Sunspot Index, Royal Observatory of Belgium, `year(s)-of-data'.
2. See http://sidc.oma.be/html/SIDCpub.html

This page hosted by: NOAA Physical Sciences Laboratory (webmaster.psl@noaa.gov) http://psl.noaa.gov/gcos_wgsp/Timeseries/SUNSPOT/index.html