Sunspots
- Sunspots are temporary phenomena on the photosphere of the Sun that appear visibly as dark spots compared to surrounding regions.
- caused by intense magnetic activity, which inhibits convection by an effect comparable to the eddy current brake, forming areas of reduced surface temperature.
- Most solar flares and coronal mass ejections originate in magnetically active regions around visible sunspot groupings. Hence sunspots are used to predict magnetic activities of sun.
- Similar phenomena indirectly observed on stars are commonly called starspots and both light and dark spots have been measured.
- Cool gas molecules of hydrogen may act as a kind of energy sink that strengthens the magnetic grip that causes sunspots.
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