Static image showing the word SILSO with a sun in the background and a chart below showin the variation in time of the sunspot index

SILSO temporary index page

This is a temporary page, please see the official page at [https://www.sidc.be/SILSO/home](https://www.sidc.be/SILSO/home) if you are not redirected automatically. Currently available on the server: - the [historical sunspot observation management tool](https://silso.observatory.be/historical_sunspot_observations/)