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

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Astronomy Picture of the Day NGC 7252, a galaxy merger
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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
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Solar Magnetic Activity
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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
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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 sun’s magnetic polarity reverses every 11 years The Sun is currently in an anomalously low activity state
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Images from the SOHO mission
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Images from the Trace mission
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Images from the Trace mission
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Images from the Trace mission
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Solar prominences Huge flows of gas at T= 5000 to 10,000 K, supported by magnetic fields Can rise hundreds of thousands of km above the sun’s surface, travel at 1,000 km/sec, and last for weeks
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