Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa43a1571s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA43A-1571
Physics
3311 Clouds And Aerosols, 3332 Mesospheric Dynamics, 3360 Remote Sensing, 3394 Instruments And Techniques
Scientific paper
Noctilucent Clouds (NLC) have been extensively observed and characterised from the ground since their first identification in 1885. It has been argued that NLC first appeared just around this time and that they are important indicators for atmospheric changes and variability. More recently it has also been demonstrated that NLC properties and occurrence frequency are intimately related to the dynamic coupling processes on global scale. Noctilucent clouds were first detected from space by an instrument on the OGO-6 satellite in 1972. It was also discovered that a permanent scattering layer exists over the polar cup during the summer. NLCs are now considered to be equatorward extenstions of this permanent layer, also sometimes called Polar Mesospheric Clouds (PMC). More recently NLC/PMC have been extensively studied by the Swedish satellite Odin launched in 2001. The AIM satellite mission, launched in 2007, is entirely dedicated to research into noctilucent clouds. The Cloud Imaging and Particle Size (CIPS) experiment on AIM is a wide angle (120° along track by 80° across track) imager consisting of four identical cameras arranged in a cross pattern. CIPS is the first space borne instrument that takes images of PMCs with a high spatial resolution and in the viewing geometry that makes comparison with the ground imagery possible. Since the summer 2004, photographs of noctilucent clouds (NLC) are taken from a site in Stockholm, Sweden (59.37°N, 18.06°E). A digital camera takes every summer night hundreds of images of twilight sky at the rate of 1 to 2 pictures per minute. A technique to re-projected these images to a horizontal plane in order to correctly represent movements and actual spatial scales have been developed. Simultaneous observations of the same NLC scene from space and from ground will be presented and discussed.
Bailey Scott M.
Pautet Dominique
Rusch David W.
Stegman Jacek
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