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Photosphere

  • First/deepest layer of the atmosphere
  • The sphere of light
    • Light we see from the Sun comes from this layer
  • 400 km thick
  • Gives the Sun an apparent surface
    • Boundary between interior and atmosphere of the Sun
  • Granular surface
    • Granules ~1000 km in size
      • Dark rings around granule are cooler spots
    • Several million granules cover the solar surface
    • Lifetime of one granule is only 5-10 minutes
  • Around 6000 K

Sun Atmosphere Astronomy