Universe Summaries

Universe Summaries - 14.1 The Sun is surrounded by a number...

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14.1 The Sun is surrounded by a number of layers that make the solar atmosphere. In order from the farthest from center: Photosphere temp. 4500 k to 6800k, Chromosphere temp. 10^4 K, transition region where temps. rise rapidly from 10^4k to 10^6 k, corona temp. a few million kelvins. Surface is hot molted w/ upwelling currents called granules . Solar Wind stream out into the solar system thru coronal holes. When they reach earth they produce auroras (bright lights) strongest near the poles. Hydrogen and helium make up 98% of the sun. 14.2 Sunspots are dark regions where temps. is up to 1500k cooler than the photosphere. Their motion allows us to calculate how fast the sun turns on its axis. The sun rotates faster at its equator; rotation of 25 days. Near the poles is longer than 36 days. Number of visible sunspots vary depending on the sunspot cycle which is about 11 years. All the north spots have the same polarity and all the south spots do…after 11 yrs they switch so ppl say the magnetic activity cycle is about 22 yrs. 15.1 Sun produces a huge amount of energy every second. Earth is 4.5 billion yrs old so we know the sun has been shining at least that long. Neither chemical burning nor gravitational contraction can account for any of the energy. 15.2
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This note was uploaded on 04/21/2011 for the course PHYSICS 0839 taught by Professor Staff during the Fall '10 term at Temple.

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Universe Summaries - 14.1 The Sun is surrounded by a number...

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