lecture22 - Astronomy Picture of the Day NGC 7252, a galaxy...

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Unformatted text preview: Astronomy Picture of the Day NGC 7252, a galaxy merger Announcements Friday: quiz in discussion section Quiz covers material from chapters 7-10: giant planets through the Sun Bring a scantron form and pencil to discussion section Solar Magnetic Activity Sunspots They are regions of magnetic activity, and occur in pairs They are cooler than the rest of the photosphere: typically around 4000 K Sizes from around 1500 km to large groups spanning 50,000 km or more Most sunspots last for only a few days The sunspot cycle The number of sunspots has a maximum about every 11 years This is actually half of a 22-year cycle since the suns magnetic polarity reverses every 11 years The Sun is currently in an anomalously low activity state Images from the SOHO mission Images from the Trace mission Images from the Trace mission Images from the Trace mission Solar prominences Huge fows oF gas at T= 5000 to 10,000 K, supported by magnetic elds Can rise hundreds oF thousands oF km above the suns surFace, travel at 1,000 km/sec, and last For weeks Solar fares...
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This note was uploaded on 11/23/2010 for the course PHYSICS PHYSICS 20 taught by Professor Aaronbarth during the Winter '10 term at UC Irvine.

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lecture22 - Astronomy Picture of the Day NGC 7252, a galaxy...

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