Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa43a1566p&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA43A-1566
Physics
0305 Aerosols And Particles (0345, 4801, 4906), 0320 Cloud Physics And Chemistry, 0340 Middle Atmosphere: Composition And Chemistry, 3332 Mesospheric Dynamics, 3384 Acoustic-Gravity Waves
Scientific paper
The Optical Spectrograph and InfraRed Imager System instrument (OSIRIS) on the limb-viewing Odin satellite observes Polar Mesospheric Clouds (PMCs) in both hemispheres since November, 2001. The orbit period of Odin is 96 minutes and the maximum latitudinal coverage in the orbit plane is between 82.2 N and 82.2 S. In this work, the longitudinal distribution of Odin/OSIRIS PMC brightness in each hemisphere during a 4-week period around the summer solstice from 2002 until 2008 is analysed. In the Northern Hemisphere, the PMC brightness around 60+-20 W and around 80+-20 E is up to 30 percent lower than that at other longitudes. In the Southern Hemisphere, the cloud brightness is also 30-60 percent lower around 80+-20 W. We attribute this effect to the influence of gravity waves generated by the Earth's terrain above Greenland and Ural mountains (the natural boundary between Europe and Asia) in the Northern Hemisphere and by the Antarctic Peninsula mountains in the Southern Hemisphere.
Petelina Svetlana V.
Rusch David W.
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