According to NASA, M class flares are stronger and are usually capable of causing radio blackouts, while X class flares can have devastating impacts, including widespread radio blackouts, knocking out satellites and even taking down power grids.
Sunspots are large, dark regions on the surface of the Sun, consisting of powerful magnetic fields.
These regions form where bands of the Sun’s own magnetic field become tangle and taut, which then inhibits the flow of hit gas coming from the star’s interior, becoming cooler, and hence darker, according to Space.com.
The Sun is currently at the peak of its 11-year cycle, which is known as the solar maximum.
Article source: https://www.express.co.uk/news/science/1660065/solar-storm-warning-sunspot-AR3085-aimed-earth-grows-radio-gps-blackout