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Outer Layers of the Sun

The Sun's Atmosphere. Photosphere - the 5800 K layer we see. Chromosphere

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Outer Layers of the Sun

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    1. Outer Layers of the Sun Photosphere Limb darkening Sun spots Chromosphere Corona Prominences, flares, coronal mass ejections Reading 18.5-18.10

    2. The Sun’s Atmosphere Photosphere - the 5800 K layer we see. Chromosphere – a thin layer, a few 1000 km thick, at a temperature of about 10,000 K. Can be seen during solar eclipse. Corona – Outermost layer, 1,000,000 km thick, at a temperature of about 1,000,000 K.

    3. Outer layers of sun

    4. Photosphere

    5. Chromosphere

    6. Corona

    7. Corona

    8. Limb darkening

    9. Limb darkening

    10. Sunspots are low temperature regions in the photosphere

    11. Particles spiral around magnetic field lines

    12. Sunspots are low temperature regions in the photosphere

    13. Sunspot cycle

    14. Sunspots can be used to measure the rotation of the Sun

    15. Sunspot cycle

    16. Granulation

    17. What direct observational evidence supports the model of thermonuclear reactions in the Sun’s core? Neutrinos Gamma rays Sun spot counts WMD inspections

    18. Solar magnetic fields also create other phenomena Prominences Flares Solar wind Coronal mass ejections

    19. Particles spiral around magnetic field lines

    20. Prominences - Cooler than photosphere.

    21. Solar flares - Hotter, up to 40,000,000 K More energetic

    22. Coronal mass ejections - eruption of gas, can reach Earth and affect aurora, satellites

    23. Coronal mass ejection

    24. Which statement is not correct? The solar coronal temperature is about 106 K. Sunspots are very cool and dark, with temperatures of about 300 K. The Sun’s core has a temperature about 107 K. The chromosphere is hotter than the photosphere.

    25. Review Questions Since the Sun is so bright, how is it possible to see its dim outer atmosphere (corona)? Where does the solar wind come from? What are sunspots? Why do they appear dark? What is the connection between sunspots and the Sun’s magnetic field? What is the sunspot cycle?

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