Start Date: End Date: Published Date Data Date
Data acquired July 15, 2010 720 x 480 JPEG
Data acquired July 15, 2010 5184 x 3456 793 KB - JPEG
Data acquired January 1, 1979 - December 31, 2010 720 x 248 PNG
Data acquired January 1, 1979 - December 31, 2010 75 KB - PDF
342 x 228 JPEG
The rare night-shining clouds seen in this photo are both forming more frequently and becoming brighter, trends that point to changes in the atmosphere linked to greenhouse gases.
Photograph ©2010 Jan Erik Paulsen. Graph by Robert Simmon, adapted from Latitude-dependent long-term variations in polar mesospheric clouds from SBUV version 3 PMC data. Caption by Holli Riebeek.
Published January 27, 2011 Data acquired July 15, 2010