On the statistical correlation between polar mesospheric cloud occurrence and enhanced mesospheric radar echoes

Details On the statistical correlation between polar mesospheric cloud occurrence and enhanced mesospheric radar echoes On the statistical correlation between polar mesospheric cloud occurrence and enhanced mesospheric radar echoes

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..315j&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, April 1988, p. 315-318.

Physics

24

Mesosphere, Noctilucent Clouds, Polar Regions, Radar Echoes, Solar Mesosphere Explorer, Statistical Correlation, Satellite-Borne Instruments, Stratosphere, Thermosphere, Ultraviolet Spectrometers, Very High Frequencies

Scientific paper

Using data from the Poker Flat MST radar and the Solar Mesosphere Explorer Satellite, the existence of a statistically significant correlation between the occurrence of Polar Mesospheric Clouds (PMC) and enhanced VHF radar echoes near the high-latitude summer mesopause is demonstrated. Three physical conditions which could explain the coexistence of strong summertime echoes and PMC are proposed: (1) both the enhanced echoes and the PMC are most likely to occur in the presence of very low mesopause temperatures and associated steep temperature gradients; (2) the presence of PMC ice particles could induce a strong gradient in the electron density profile, which would produce enhancements in the radar echo strength; and (3) it is likely that heavy water cluster ions can alter the ambipolar diffusion coefficient, allowing the electron density fluctuations to extend down to much smaller vertical scales.

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