Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa31b10m&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SA31B-10
Physics
0300 Atmospheric Composition And Structure, 0305 Aerosols And Particles (0345, 4801), 0320 Cloud Physics And Chemistry, 0355 Thermosphere--Composition And Chemistry
Scientific paper
Recently, an analysis of the Halogen Occultation Experiment (HALOE) infrared solar occultation measurements confirmed for the first time the long-held belief that polar mesospheric clouds (PMCs) are composed of water-ice. Here we present an analysis of HALOE's long-term record of these clouds, covering both hemispheres and spanning nearly a complete solar cycle. Continuing since 1991, HALOE has amassed over 7,000 soundings in the polar-summer (above 50 degrees latitude and within six weeks of summer solstice), providing a unique and valuable dataset for the study of PMCs. We discuss methods for extracting spectral signatures and particle size estimates from the measurements. We examine the occurrence statistics of the clouds in both hemispheres, for sunrises and sunsets, and time during the PMC season. We also discuss an improved observational procedure that enhances the signal quality at these altitudes. With continued operations in the next few years we will be able to refine these measurements, extend the record to cover at least one complete solar cycle and obtain validation opportunities.
Gordley Larry L.,
Hervig Mark E.
McHugh Martin J.
Russell James M.
Thompson Raymond E.
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