Properties of polar mesospheric clouds measured by Odin/OSIRIS in the northern hemisphere in 2002-2005

摘要: Interseasonal variations in the properties of Polar Mesospheric Clouds (PMC) measured by Optical Spectrograph and InfraRed Imager System (OSIRIS) on Odin satellite during northern hemisphere (NH) summers 2002–2005 are described this work. The lowest PMC latitudes were about 50°N for every season with number detections smallest 2002 largest 2004. In 2004 2005, detection PMCs at lower was asymmetric larger clouds observed first half fewer second season. occurrence frequency 25–30% than 2003–2005, duration shortest longest For all NH seasons except 2002, systematically 20–50% higher Solar Mesosphere Explorer climatology. Similar to frequency, cloud brightness highest latitudes. daily mean maximum 50°–60°N less 8% o...