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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 July 30   
      A bright green spiral aurora is seen in a break in the clouds before a   
         purple background. The foreground contains green grassland and a   
            circular lake. Please see the explanation for more detailed   
                                   information.   
      
                        Spiral Aurora over Icelandic Divide   
         Image Credit & Copyright: Juan Carlos Casado (Starry Earth, TWAN)   
      
      Explanation: Admire the beauty but fear the beast. The beauty is the   
      aurora overhead, here taking the form of a great green spiral, seen   
      between picturesque clouds with the bright Moon to the side and stars   
      in the background. The beast is the wave of charged particles that   
      creates the aurora but might, one day, impair civilization. In 1859,   
      following notable auroras seen all across the globe, a pulse of charged   
      particles from a coronal mass ejection (CME) associated with a solar   
      flare impacted Earth's magnetosphere so forcefully that it created the   
      Carrington Event. This assault from the Sun compressed the Earth's   
      magnetic field so violently that it created high currents and sparks   
      along telegraph wires, shocking many telegraph operators. Were a   
      Carrington-class event to impact the Earth today, speculation holds   
      that damage might occur to global power grids and electronics on a   
      scale never yet experienced. The featured aurora was imaged in 2016   
      over Thingvallavatn Lake in Iceland, a lake that partly fills a fault   
      that divides Earth's large Eurasian and North American tectonic plates.   
      
                     Almost Hyperspace: Random APOD Generator   
                        Tomorrow's picture: moon over mars   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Phillip Newman Specific rights apply.   
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