4 - -The sun was at a minimum in its solar cycle in...

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Earths magnetic field deflects the particles. it strike Earth at the North and South Poles. Aurora - Particles from a solar storm can endanger astronauts - When they strike the Earth’s atmosphere, they produce Aurora Borealis, the Northern Lights. Sun’s Magnetic Field - Like the Earth, the sun has a magnetic field. - As the sun rotates, its magnetic field lines become twisted. - When they reach the surface of the Sun, they emerge as sunspots. - Sunspots appear on the sun, and last for a few weeks. - The number of spots on the sun changes from day to day. Sunspots … are cooler regions of the photosphere (T = 4240 K) The Solar Activity Cycle - The sunspots cycle : every 11 years the number of sunspots increases - Every 11 years the north and south magnetic poles reverse! - So the “solar activity cycle” is actually a 22 year cycle.
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Unformatted text preview: -The sun was at a minimum in its solar cycle in 2007.-The number of spots is now increasing (400 Years of Sunspots Observations) The 11 year sunspots cycle has been observed for centuries. However, from 1645 to 1715, very few sunspots were observed. This lack of spots is called the “Maunder Minimum” On Earth, extreme cold temperatures were reported… The Sun & Earth’s Climate-In the 1600s-1700s Europe experienced the “Little Ice Age”-In England, the river Thames froze.-In N. America, Lake Superior was frozen until June!-However today, the sun is behaving normally.-Modern climate changes are not caused by the abnormal solar activity. The Interior of the Sun-All solar energy is generated in the core.-The core is about 10% of the Sun’s diameter...
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This document was uploaded on 10/07/2011.

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