Thursday, August 31, 2017

Sunspot Report for NearSys Station, 31 August 2017

Tiday's sunspot image shows three large sunspots.

A calculation of the size of the largest sunspot determines it's umbra is 13,856 miles in diameter and it's pemumbra is 30,483 miles in diameter.

Compare this to Earth with a diameter of 7918 miles.

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