The Diurnal and Seasonal Variation of PMCs Near 55° N Observed by SHIMMER and CIPS: Implications to Long Term PMC Trends

Details The Diurnal and Seasonal Variation of PMCs Near 55° N Observed by SHIMMER and CIPS: Implications to Long Term PMC Trends The Diurnal and Seasonal Variation of PMCs Near 55° N Observed by SHIMMER and CIPS: Implications to Long Term PMC Trends

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa21a0261s&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA21A-0261

Physics

Optics

0319 Cloud Optics, 0320 Cloud Physics And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 3311 Clouds And Aerosols

Scientific paper

The Spatial Heterodyne Imager for Mesospheric Radicals (SHIMMER) is designed to measure OH solar resonance fluorescence near 309 nm by imaging the Earth's limb. It has been observing OH and PMCs up to about 58° N since March 16, 2007 from the STPSat-1 satellite. SHIMMER has a local time precession of ~30 min/day so that during the 2007 northern hemisphere summer it observed the entire OH and PMC diurnal cycle. SHIMMER observed hundreds of PMCs in 2007 between 50-58° N. These data complement the PMC data from NASA's Aeronomy of Ice in the Mesosphere (AIM) mission, which are made near local noon. We will compare the SHIMMER PMC frequencies at local noon to those from the Cloud Imaging and Particle Size (CIPS) instrument on AIM. Using the seasonal PMC dependence observed by CIPS, we will infer the local time dependence on PMC frequency for the 2007 NH summer from the SHIMMER observations. We will then consider the implications to long term PMC trends as applied to satellite observations that vary slowly in local time from year to year.

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