11.2.2007 Astronomy notes

11.2.2007 Astronomy notes - 11.2.2007 Astronomy In sunspot...

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11.2.2007 – Astronomy In sunspot regions, magnetic field is 1000 times stronger Sunspots usually come in pairs Alignment is opposite in different hemispheres Equator is spinning faster than the poles, so the magnetic field becomes wrapped This continues for 11 years, at which point they fall apart and the sun reorganizes itself w/ polar axis reversed Sunspot cycle: repeats every 11 years. Number of sunspots changes with times Solar cycle: including polarity, 22 year period. During the maunder minimum, there were hardly any sunspots. This affected earth, even the weather. The luminosity of the sun increases by a few tenths of 1% with the sunspot cycle Little Ice Age: second half of 1600s Prominence: quiescent and active. Quiescents last from days to weeks. Actives last hours. Gas temps are typically around 1million K. More intense: Flares (minutes), about 100 million K. does not fall back into sun, can escape magnetic field. Coronal mass ejection (CME): most powerful Solar corona: gas around the sun that gets heated by magnetic activity on the surface Solar energy production : Fundamental forces of nature: (4) - Gravity. Attractive force between all particles - Electromagnetic. Attractive or repulsive only for charged particles. Usually cancels out over large scales. Much
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This note was uploaded on 09/24/2009 for the course ASTR 101 taught by Professor Christiansen during the Fall '08 term at UNC.

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11.2.2007 Astronomy notes - 11.2.2007 Astronomy In sunspot...

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