The Sun Sets and the Six Month Winter Begins; South Pole, March 20, 2010 |
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Global Monitoring Division - ESRL-GMD This story entered on 25th Mar, 2010 09:38:19 AM PST Two NOAA/ESRL personnel are wintering over at the U.S. Amundsen-Scott South Pole Station and in coming days they will watch the final glimmer of the sun sink below the horizon as the polar plateau plunges into 6 months of darkness. It is difficult to predict the exact time the last glimmer of the sun will be seen at South Pole each season due to atmospheric refraction. The time of the equinox and official sunset time was 13:32 EDT (17:32 GMT) on March 20, 2010. Historically, the sun may be visible for up to two days beyond the equinox and will then remain below the horizon until approximately September 22, 2010 when it will rise again for 6 months. For the 2010 austral winter two NOAA/ESRL personnel will work at the South Pole Baseline Atmospheric Research Observatory, Johan Booth and LT(jg) Nicholas Morgan. During the winter months temperatures can drop as low as -75C (-100 F) at the geographic pole. These cold winter temperatures make it impossible for the ski-equipped C-130 aircraft to land at South Pole isolating the winter “polie” population from the rest of the world for 8 months. Only when the surface air temperatures reach -50C (-58F) next October will the planes be able to safely land at South Pole again. Staff venturing outside during the winter at South Pole are often treated to brilliant auroras (known as Aurora Australis in the southern hemisphere) and some of the most amazing night sky views on the planet due to the high altitude 9,305 ft. (2,837 m), low moisture, and few clouds at the South Pole. To view the dwindling twilight at South Pole, go the live NOAA/ESRL web camera at http://gml.noaa.gov/obop/spo/livecamera.html. Contact information |