Solar Cycle 25 is officially here
The Solar Cycle 25 Prediction Panel, an international group of experts co-sponsored by NASA and NOAA, announced that the solar minimum occurred in December 2019, marking the start of a new solar cycle.
Because our Sun is so variable, it can take months after the fact to declare this event.
Scientists use sunspots to track solar cycle progress; the dark blotches on the Sun are associated with solar activity—often as the origins for giant explosions such as solar flares or coronal mass ejections—which can spew light, energy and solar material into space.
This and more has been explained on the NASA website.
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