Sunspotter is a Zooniverse citizen science project in which participants ”
help to organize sunspot images in order of complexity to better understand and predict how the Sun’s magnetic activity affects us on Earth.
The Sunspotter blog includes interesting items such as this Space weather – a short guide and The Making of a Magnetogram Part I: Lost in a Magnetic Field.
“Sunspots vary in size and tend to range between 1.500 – 50,000 km,
making some larger than Earth.Observed with the Swedish 1-m
Solar Telescope (SST). The SST is operated on the island of La Palma
by the Institute for Solar Physics in the Spanish Observatorio del Roque
de los Muchachos of the Instituto de Astrofísica de Canarias.
Observations: Göran Scharmer and Kai Langhans, ISP.
Image processing: Mats Löfdahl, ISP”
See the HobbySpace Sun & Space Weather page here for real time images and data.