Longitudinal variability in PMC structures observed from the CIPS experiment on the AIM spacecraft: Impact on PMC occurrence frequency and brightness.

Details Longitudinal variability in PMC structures observed from the CIPS experiment on the AIM spacecraft: Impact on PMC occurrence frequency and brightness. Longitudinal variability in PMC structures observed from the CIPS experiment on the AIM spacecraft: Impact on PMC occurrence frequency and brightness.

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa43a1564c&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA43A-1564

Physics

0300 Atmospheric Composition And Structure, 0342 Middle Atmosphere: Energy Deposition (3334), 0394 Instruments And Techniques, 3332 Mesospheric Dynamics, 3334 Middle Atmosphere Dynamics (0341, 0342)

Scientific paper

The Cloud Imaging and Particle Size (CIPS) experiment is one of three instruments on board the Aeronomy of Ice in the Mesosphere (AIM) spacecraft that was launched into a 600 km sun-synchronous orbit on April 25, 2007. CIPS images have shown clear and distinct wave patterns and structure in Polar Mesospheric Clouds (PMCs), around the summertime mesopause region, which are qualitatively similar to ground based photographs of Noctilucent Clouds (NLCs). These structures, observed in PMCs, are interpreted as manifestations of upward propagating gravity waves. One of the objectives of the AIM mission is to investigate gravity wave effects on PMC formation and evolution. In this presentation we provide new results pertaining to the longitudinal variability of observed PMC wave structures from CIPS. The horizontal scales and maps of the observed PMC structures during the northern and southern hemisphere 2007 and 2008 cloud seasons are presented. By comparing the longitudinal variability of the normalized wave occurrence frequency with the CIPS observed PMC occurrence frequency and albedo we can infer new details about the effect of gravity waves on PMCs. The spatial variability of the observed longitudinal structures and correlation with topography are also presented.

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