Exploring the Structure and Phenomena of the Sun

Discover the intricate balance and core structure of the Sun, maintained by hydrostatic equilibrium. Energy moves through radiation and convection zones, with convection manifesting as granulation on the photosphere. Eclipses, such as solar eclipses, provide unique opportunities to witness celestial alignments. Learn about umbra and penumbra regions during eclipses.

• Sun
• Structure
• Hydrostatic
• Equilibrium
• Convection

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1. The Sun

2. Core: Internal Balance (Hydrostatic Equilibrium) Structure of the Sun depends on a balance between its internal forces hydrostatic equilibrium -> a force that prevents the Sun from collapsing and a force that holds it together The inward (holding) force is the Sun s own gravity, while the outward (non- collapsing) force arises from the Sun s internal gas pressure

4. Near the Suns center, energy moves outward Region surrounding the core is the radiation zone

5. Above the radiation zone energy is more efficiently transported by the rising and sinking of gas this is the convection zone http://t0.gstatic.com/images?q=tbn:ANd9GcTjOYsf3_-rps-0cTVBkWnPgl3UnsBCrYcZoYEtvSbRfvxoCPkf

6. Convection manifests itself in the photosphere as granulation, numerous bright regions surrounded by narrow dark zones http://t0.gstatic.com/images?q=tbn:ANd9GcSgkjD_nV9UQ7eXoup0st2NLT5H4auInWa63vG6M3b8gVXAKjo_

7. http://www.nasa.gov/images/content/706822main_20121113-totaleclipse-orig_full.jpghttp://www.nasa.gov/images/content/706822main_20121113-totaleclipse-orig_full.jpg

8. Eclipses Solar Eclipse Moon passes directly in front of the Sun - Day turns to night Total Eclipse Perfect alignment of Sun, Moon, Earth - Planets, some stars become visible during the day - Can only be seen from small portion of daytime side of the Earth Corona becomes visible ONLY visible during eclipse

10. Umbra Central region of shadow - Total eclipse - Very small area Penumbra Shadow outside of umbra - Partial eclipse - Large area

12. Lunar Eclipse When sun casts a shadow of the Earth onto the surface of the Moon.