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Sunspot Index Data Center (SIDC)
Founded in 1981 to continue the work of the Z?rich Observatory.
Solar Terrestrial Activity Report
Overview of solar and geomagnetic activity. Graphical comparison of recent solar cycles, sunspots, and solar flux. Generally updated once a day.
Inter-Sol Programme (ISP)
International programme with the purpose of observing the daily sunspot activity.
Introduction to how they were first computed by Rudolph Wolf in 1848, and how they are computed today.
Exploratorium's Guide to Sunspots
Explore the nature of sunspots and the fascinating history of our efforts to understand them.
K-12 educational site.
Sunspots, Aurora, and Magnetic Disturbances
Looking for the connection between the phenomena.
Educator's Guide to Sunspots
Classroom activity from the Jet Propulsion Laboratory's Education Gateway.
Sunspots and the Solar Cycle
Up-to-date monitoring of the sunspot cycle and Earth's aurora.
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