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   TZUTC: -0800   
   CHRS: LATIN-1 2   
                           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 December 11   
      
                        Solar Minimum versus Solar Maximum   
                           Video Credit: NASA, SDO, SVS   
      
      Explanation: The surface of our Sun is constantly changing. Some years   
      it is quiet, showing relatively few sunspots and active regions. Other   
      years it is churning, showing many sunspots and throwing frequent   
      Coronal Mass Ejections (CMEs) and flares. Reacting to magnetism, our   
      Sun's surface goes through periods of relative calm, called Solar   
      Minimum and relative unrest, called Solar Maximum, every 11 years. The   
      featured video shows on the left a month in late 2019 when the Sun was   
      near Solar Minimum, while on the right a month in 2014 when near Solar   
      Maximum. The video was taken by NASA's Solar Dynamic Observatory in far   
      ultraviolet light. Our Sun is progressing again toward Solar Maximum in   
      2025, but displaying even now a surface with a surprisingly high amount   
      of activity.   
      
       Night Sky Network webinar: APOD editor to review coolest space images   
                                      of 2023   
                       Tomorrow's picture: double sky arches   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
                   NASA Web Privacy Policy and Important Notices   
                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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