Highest Sunspot Number in 20 years: Monitor the high bands.

The Earthside of the sun just hit its highest sunspot number (299) in more than 20 years. The farside sunspot count might be even higher. Helioseismic maps of the farside of the sun reveal vast areas of potential sunspot activity:

The black blobs are sunspots so large they effect the way the whole sun vibrates. NASA’s Solar Dynamics Observatory can measure the vibrations, allowing helioseismologists to pinpoint farside sunspot groups even though they are invisible from Earth. Farside activity visible in today’s map is among the most widespread of Solar Cycle 25.

Article from spaceweather.com

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