Magnetic Fields and Sunspots

Magnetic Fields and Sunspots - Magnetic Fields and Sunspots...

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Unformatted text preview: Magnetic Fields and Sunspots Sun has strong magnetic field Field flips every 11 years returns to same direction every 22 years Sunspots • dark regions on Sun • 1 ­ 3 x size of Earth • cooler than surrounding areas (4000 K vs. 6000 K) • last up to several months • usually appear in pairs o • pairs have strong magnetic field with one spot a North pole and one a South pole number of sunspots varies in 11 year cycle o next maximum in 2000­2001 Evolution of Sun • Hydrogen Burning o o • lasts 10 billion years half way through this stage Red Giant o o sun expands to almost Earth's orbit o • when hydrogen in core is used up lasts 500 million years Helium Burning o • lasts 10 ­ 100 million years Red Giant II o o sun expands beyond Earth's orbit o • when helium in core is used up lasts 1 million years Mass loss o o • lasts100,000 years outer layers of Sun are slowly blown off White Dwarf o o no more nuclear reactions ­ so slowly cools o • only core remains lasts 5 ­ 20 billion years Black Dwarf o eternity o cold, dark ball of gas ...
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Magnetic Fields and Sunspots - Magnetic Fields and Sunspots...

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