the sun as the prime example of stellar structure and evolution
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The Sun as the prime example of stellar structure and evolution
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The Sun
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Close-up of a G2 Main Sequence Star
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Stellar Interior
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The Solar Interior…the prime application of the equations of stellar
structure
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Density in the solar interior
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Temperature in the Solar Interior
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The “Faint Young Sun Paradox”
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The Neutrino Sun
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Solar Neutrino Experiments
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Helioseismology: Eigenmodes of the Sun
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The Solar Atmosphere
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Layers of the Solar Atmosphere
• Photosphere
• Chromosphere
• Corona
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Granules in the Solar
Atmosphere
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The Chromosphere-region of partially ionized hydrogen
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The Solar Corona
What is it? How did it get that way?
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Corona shines at level of one millionth the photosphere. It is Thompson scattered
sunlight
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To understand astronomical objects, astronomers take
spectraThe spectrum of the corona reveals
its most interesting characteristic
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The dominant ionization state depends on the temperature…
example N
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The X-Ray Sun
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The Temperature Profile in the Solar Atmosphere
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The key to understanding the corona is the solar magnetic field
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Above the corona: direct magnetometer measurements
in the solar wind
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The Flowing Medium of the Solar Wind