Alan in Antarctica

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Polar stratospheric clouds (PSCs)

  These Type II clouds, at about 20 km elevation in the stratosphere, are necessary for formation of the ozone hole.  Aug. 24, 2004

  Another PSC out over the ice shelf.  Aug. 24, 2004

  A PSC at sunset, Aug. 27, 2004.  The pink cloud is "steam" from the building, lit by the setting sun.

  The most beautiful PSCs yet, Aug. 29, 2004.

  The same clouds 10 minutes later with the sunset.

  PSCs at sunrise, September 10, 2004.

  Another view of PSCs at sunrise, September 10, 2004.

  A little later, September 10, 2004.

  PSCs at sunset, Sept. 25, 2004.  For more PSCs, see the sunset pictures from Sept. 26.



  Francesco and Roberto run the lidar as part of our group.

  They were able to fix it to improve its performance from the winter.  It will be run during the night to measure PSCs and temperature.

  Lidar beam leaving the instrument going up through the glass ceiling.

  It is hard to see, but the beam is going up to the right of our antenna.

  Lidar beam on Sept. 15, 2004.  It was cloudy and snowing, so you can see the strong reflection at the top of the picture and the sparkle from the snow flakes in the beam.  This was not a good night for being able to see PSCs.

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