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                           Astronomy Picture of the Day   
      
       Discover the cosmos! Each day a different image or photograph of our   
         fascinating universe is featured, along with a brief explanation   
                       written by a professional astronomer.   
      
                                  2023 January 14   
      
                                Perihelion Sun 2023   
          Image Credit & Copyright: Peter Ward (Barden Ridge Observatory)   
      
      Explanation: Perihelion for 2023, Earth's closest approach to the Sun,   
      was on January 4 at 16:17 UTC. That was less than 24 hours after this   
      sharp image of the Sun's disk was recorded with telescope and H-alpha   
      filter from Sidney, Australia, planet Earth. An H-alpha filter   
      transmits a characteristic red light from hydrogen atoms. In views of   
      the Sun it emphasizes the Sun's chromosphere, a region just above the   
      solar photosphere or normally visible solar surface. In this H-alpha   
      image of the increasingly active Sun planet-sized sunspot regions are   
      dominated by bright splotches called plages. Dark filaments of plasma   
      snaking across the solar disk transition to bright prominences when   
      seen above the solar limb.   
      
                       Tomorrow's picture: cosmic crustacean   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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