MSGID: 1:317/3 64417dca   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
   April 20, 2023 - Contrails over Scandinavia   
      
      Contrails over Scandinavia   
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      The skies over Scandinavia were crisscrossed with condensation trails,   
      each tracing the passage of aircraft, on April 18, 2023. The Moderate   
      Resolution Imaging Spectroradiometer (MODIS) on board NASA’s Aqua   
      satellite acquired this true-color image on that same day.   
      
      High-altitude aircraft often leave behind condensation trails, or   
      contrails, especially when flying through humid air. Contrails form in   
      the wake of passing aircraft due to particles and water vapor contained   
      in their exhaust. Airplane jet engines produce water vapor as they burn   
      jet fuel. At high altitudes (above 20,000 feet), the air is so cold   
      that the expelled vapor quickly condenses and freezes. In dry air,   
      these ice crystals will undergo sublimation, changing directly from   
      solid into a gas, leaving no visible trace. However, when the air is   
      humid, long, linear cirrus clouds form along the track of the passing   
      plane.   
      
      In this image, a few contrails can be seen over Norway (upper left) and   
      Sweden (upper right). In contrast, the skies over Denmark’s Jutland   
      Peninsula as well as the waters of the Skagerrak between Denmark,   
      Norway, and Sweden are thick with contrails. The city of Copenhagen,   
      Denmark, is served by two airports, with the Copenhagen Kastrup Airport   
      the busiest in Scandinavia. It serves 61 different airlines with   
      flights heading to 121 different destinations.   
      
      Image Facts   
      Satellite:  Aqua   
      Date Acquired: 4/18/2023   
      Resolutions:  1km (350.6 KB),  500m (1.1 MB),  250m (2.9 MB)   
      Bands Used: 1,4,3   
      Image Credit: MODIS Land Rapid Response Team, NASA GSFC   
      
      
      
   https://modis.gsfc.nasa.gov/gallery/individual.php?db_date=2023-04-20   
       
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