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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.   
      
                                  2024 December 8   
           A picture of Saturn is shown with tan clouds and light rings.   
       Surrounding the north pole at the top are bright blue swirls. Please   
                see the explanation for more detailed information.   
      
                         Aurora around Saturn's North Pole   
       Image Credit: NASA, ESA, Hubble, OPAL Program, J. DePasquale (STScI),   
                               L. Lamy (Obs. Paris)   
      
      Explanation: Are Saturn's auroras like Earth's? To help answer this   
      question, the Hubble Space Telescope and the Cassini spacecraft   
      monitored Saturn's North Pole simultaneously during Cassini's final   
      orbits around the gas giant in September 2017. During this time,   
      Saturn's tilt caused its North Pole to be clearly visible from Earth.   
      The featured image is a composite of ultraviolet images of auroras and   
      optical images of Saturn's clouds and rings, all taken by Hubble. Like   
      on Earth, Saturn's northern auroras can make total or partial rings   
      around the pole. Unlike on Earth, however, Saturn's auroras are   
      frequently spirals -- and more likely to peak in brightness just before   
      midnight and dawn. In contrast to Jupiter's auroras, Saturn's auroras   
      appear better related to connecting Saturn's internal magnetic field to   
      the nearby, variable, solar wind. Saturn's southern auroras were   
      similarly imaged back in 2004 when the planet's South Pole was clearly   
      visible to Earth.   
      
        Your Sky Surprise: What picture did APOD feature on your birthday?   
                                    (post 1995)   
                       Tomorrow's picture: how many sisters?   
        __________________________________________________________________   
      
          Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)   
               NASA Official: Amber Straughn Specific rights apply.   
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                         A service of: ASD at NASA / GSFC,   
                              NASA Science Activation   
                                & Michigan Tech. U.   
      
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