Sunspots
28 ( ) 1611 .



960 96 1947 130 .

4000 ( K ) 3700 5500 ( K ) 5200 .

2000 4000 ( ) 0.3 ( ) 0.7 ( ) Faculae Faculae .

.

( ) .

11 .

radioactive isotope beryllium - 10 .

10 10 .



10 60 10 10 1890 .

1645 1715 .