Winter Sunset in Alaska (1949) (IMAGE) National Oceanic and Atmospheric Administration Caption A winter sunset over the North Slope - note the parallel ridges in the snow. They always lay ENE-WSW in this area. The orientation of the ridges was used to navigate away from camp. Credit Courtesy of National Oceanic and Atmospheric Administration/Department of Commerce. Photographer: Rear Admiral Harley D. Nygren, NOAA Corps (ret.) Usage Restrictions Image credit to National Oceanic and Atmospheric Administration/Department of Commerce is required. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.