[HN Gopher] NASA Observes First Visible-Light Auroras at Mars
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       NASA Observes First Visible-Light Auroras at Mars
        
       Author : pseudolus
       Score  : 24 points
       Date   : 2025-05-14 18:40 UTC (3 days ago)
        
 (HTM) web link (www.jpl.nasa.gov)
 (TXT) w3m dump (www.jpl.nasa.gov)
        
       | globie wrote:
       | Very cool. It's too bad that Chroma noise is apparently quite
       | visible on other planets too.
       | 
       | It took me a while to understand what looks like a legend in the
       | article's image. I don't think it is a legend, those are color
       | swatches showing that if you subtract the aurora color from the
       | left image and add it to the right, the resulting color is very
       | similar ("Observed sky" on left is similar to "Observed sky +
       | aurora" on right), strongly suggesting the presence of green
       | aurora.
        
       | widforss wrote:
       | Interesting. But given the lack of magnetic field, how does the
       | particles enter the atmosphere on the _backside_ (night side) of
       | the planet? On Earth it 's easier to understand due to the
       | magnetic field and that the polar regions also are very close to
       | the day-side at all times.
        
         | Sharlin wrote:
         | Probably was soon after sunset.
        
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       (page generated 2025-05-17 23:00 UTC)