Lecture24.doc - Sunspots

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Sunspots Dark regions on the Sun that are dark because they are cooler than the  surrounding area. Related to magnetic activity. Sunspots have a 22-year cycle as the Sun reverses its magnetic field.  These do seem to  affect conditions (perhaps weather) on Earth. Flares:   Bright, short-lived regions of storm activity on the Sun. Prominences:   Loops of material ejected from the surface confined to magnetic fields  tied to the sunspots. Granulation:  “Boiling” of the surface of the Sun.   Solar Oscillations:  disturbances make the Sun ring like a bell; these frequencies can be measured on Earth to tell us about  the internal structure of the Sun.  Just as the frequencies of a  bell tell us about its construction. A few basic questions related to the Sun: 1) The optical portion of the spectrum is only a tiny sliver of the total  electromagnetic spectrum.  Why is it that our eyes just happen to be sensitive 
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Lecture24.doc - Sunspots

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