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The Sun

Discussion. Why does the Sun shine? . Discussion. How do you know the Sun is hot? . . Discussion. Why is there less solar intensity at sea level than there is at the top of Earth's atmosphere? . Discussion. Where do you think that energy goes? . Discussion. Why isn't the Sun a perfect blackbody? .

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The Sun

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    1. The Sun

    2. Discussion

    3. Discussion

    5. Discussion

    6. Discussion

    7. Discussion

    9. Solar Data

    10. The Sun as a big cosmic light bulb 4X 10^26 watts4X 10^26 watts

    11. Discussion

    12. Thermal equilibrium

    13. No cooling ember

    14. Discussion

    15. Kelvin-Helmoltz contraction

    16. Discussion

    17. Discussion

    18. Hydrostatic Equilibrium

    19. The age of the Sun

    20. What energy source can keep the Sun hot for 3.8 billion years?

    21. E = m c2

    22. The Sun is huge!

    23. The Sun’s Mass is Converted to Energy

    24. Thermonuclear Fusion

    25. How does it work?

    26. Proton-Proton chain

    28. Neutrinos 100 trillion/sec100 trillion/sec

    31. How do we know thermonuclear fusion is taking place in the Sun? Temp greater than 10 million K, average speed of 2 million mi/hrTemp greater than 10 million K, average speed of 2 million mi/hr

    32. We can test the theory that the Sun is powered by thermonuclear fusion by: Modeling the solar interior Direct observations of solar neutrinos

    34. Discussion

    36. Discussion

    37. Pressure increases toward the center of the Sun

    38. Discussion

    39. Density increases toward center of the Sun

    40. Temperature increases toward the center of the Sun

    42. Discussion

    43. Fusion only takes place in the Sun’s core

    44. Discussion

    45. Discussion

    46. Discussion

    47. Discussion

    48. Negative feedback

    49. Discussion

    50. Discussion

    51. Heat Transport in the Sun Conduction Convection Radiative Diffusion

    52. Discussion

    53. Radiative Diffusion Light that starts off as a gamma ray in core ends up as an x-ray at bottom of convective zone. Light that starts off as a gamma ray in core ends up as an x-ray at bottom of convective zone.

    55. Convection

    56. Why the transition?

    57. Discussion

    58. Only hydrogen within core (25%) can fuse. Only hydrogen within core (25%) can fuse.

    59. Discussion

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