Sunspot Number Archive


An X-ray picture of the Sun

An X-ray picture of the Sun

Sunspot measurements for more than 150 years have been collected together by the Sunspot Index Data Center in Belgium. This is, of course, a lot of data but you can use the form below to select a sub-set of the data and the format you want it in. You will then be able to download your data and study it.

Sunspot Data Selection Form

Fill in each section of the form and the click on the "Get Data" button at the bottom. Your data will then be prepared for you.

Data selection:
Daily
Daily sunspot numbers, one row per day.
Week per row
Daily sunspot numbers with one weeks data in each row.
Monthly
Average sunspot number for each month.

 

Period:

What range of dates are you interested in? (Data is available from 1850 to the end of 2001)

From the start of
Until the end of

 

Record separator:

How would you like the different columns in the file to be separated?
If you are not sure, select SPACE.

Selected one of:

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