OUR SUN

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OUR SUN
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Solar telescope
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FUSION

• Need very high temperatures
• H H ? He energy
• Energy heat
• Light
• EM radiation

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Compositon of the Sun

• 90 H 10 He
• Plasma- gas stripped of electrons

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Sun Layers
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core

• Where Fusion is taking place
• 15 million ºC

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Radiative Zone

• EM radiation is traveling through this zone
• 2.5 million ºC

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CONVECTIVE ZONE

• Convection currents
• Hot gases rise to surface, cooler gases sink
  turbulance

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Photosphere

• Suns surface
• Bubbling plasma
• Only 6,000 ºC!

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chromosphere

• Suns atmosphere
• 20,000 C
• Source of flares/prominences

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chromosphere
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CORONA

• Crown
• See only during solar eclipses
• 2 million C
• Made of ions

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Journey from the center of the sun
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SUNSPOTS

• Cool spots on sun
• Caused by twisting of magnetic field?

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Oct. 17, 2012

• Main sequence star

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How long is a sunspot cycle?
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11 year sunspot cycle
Cycle number
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Solar prominences(filaments)

• Follows magnetic force of sunspots
• Can last for weeks to a year
• harmless

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Solar flares

• Violent eruption
• Last for minutes
• Can damage satellites
• Can reach Earth- ohoh!

http//www.youtube.com/watch?vR4fX-iFDoDY
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Coronal Mass Ejections

• Produced in corona
• Large storms
• Can cause power outages, satellite damage and
  auroras

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Solar wind

• Ions are so hot, gravity cant hold them onto the
  sun
• 400 km/sec (1 million mph)
• Today speed 449.5 km/sec

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AURORAS(Northern lights)caused when Suns ions
enter Earths atm.
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Auroras from space
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Solar activity

• SpaceWeather.com
• http//www.youtube.com/watch?vnmDZhQAIeXMsafety_
  modetruepersist_safety_mode1safeactive