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Our Sun is a turbulent, active star

Our Sun is a turbulent, active star. that can have dramatic effects on the Earth and other planets. The Sun is the only star known to grow vegetables. (Dr.Philip Scherrer, Stanford University). Why Study the Sun?. SOHO. Understand how the Sun affects the Earth and the solar system

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Our Sun is a turbulent, active star

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  1. Our Sun is a turbulent, active star that can have dramatic effects on the Earth and other planets

  2. The Sun is the only star known to grow vegetables. (Dr.Philip Scherrer, Stanford University) Why Study the Sun? SOHO • Understand how the Sun affects the Earth and the solar system • Understand how stars work • Understand more about the laws of nature SDO

  3. As the Sun turns Like the Earth, the Sun rotates. However, unlike the Earth, the Sun has a complex rotation mechanism.

  4. What makes the Sun hot? Fusion in the Sun’s core produces heat/energy

  5. The Sun’s Roiling Surface Size of Earth, for comparison Like fudge or oatmeal cooking, the Sun’s surface boils up with heat, then crashes down

  6. Sunspots Sunspots denote regions of strong magnetic fields. They appear dark because they are relatively cooler than the surface.

  7. How do magnetic fields cause solar activity? Most sunspots and events on the Sun are caused by eruptions and tangles of complex magnetic fields

  8. Seeing Magnetic Field Lines Plasma emission traces out magnetic fields in the solar corona

  9. The 11 year sunspot cycle The amount of magnetic activity on the Sun varies in an 11 year cycle. A regular cycle of sunspot numbers over the past 300 years.

  10. Dramatic changes occur during the solar cycle X-ray and magnetic activity compared

  11. Solar Eruptions Common during the Sun’s active periods Huge flare of 28 October 2003 Solar prominence dwarfs Earth in size

  12. Explosions on the Sun(Coronal Mass Ejections) A billion tons of hot gas being launched from the Sun. White circle in image indicates size and location of Sun, which is blocked by a metal disk in the instrument.

  13. A solar “wind” streams into the solar system and shapes Earth’s magnetosphere

  14. The Sun generates Space Weather in our solar system Solar activity can have a dramatic impact on communications, satellites, and astronauts.

  15. Solar activity causes colorful aurorae

  16. Space Weather affects the Moon and other planets we hope to explore. Mars Aurorae on Neptune, Saturn, and Jupiter

  17. What color is the Sun? 1

  18. The Sun appears white to us but it radiates in all wavelengths (visible and nonvisible “colors”) The electromagnetic spectrum

  19. White Light Contains “Hidden” Information

  20. Hidden in light is information about its source’s temperature, makeup, even speed and distance We are going to learn how to “read” this information

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