Multiple-frequency studies of the high-latitude summer mesosphere - Implications for scattering processes

Details Multiple-frequency studies of the high-latitude summer mesosphere - Implications for scattering processes Multiple-frequency studies of the high-latitude summer mesosphere - Implications for scattering processes

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jatp...52..907h&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 52, Oct.-Nov. 1990, p. 907-926. Research supported by SDIO

Physics

29

Eiscat Radar System (Europe), Mesosphere, Polar Regions, Radar Echoes, Radar Scattering, Incoherent Scattering, Radar Cross Sections, Summer, Very High Frequencies

Scientific paper

The characteristics of polar mesosphere summer echoes (PMSE) are studied at 53.5 and 224 MHz. Observations at 2.78 MHz, simultaneous with the ones at the other two frequencies, were carefully compared for indications of PMSE, but no obvious relation was found. Relationships among the relative scattering cross section, the spectral width, and the vertical velocity are studied for the 224-MHz radar, and observations at 53.5 MHz are compared with those at 224 MHz. Results of aspect sensitivity measurements at 53.5 MHz are presented. The implications of these characteristics for several possible scattering mechanisms are discussed. Incoherent scatter and chemically induced fluctuations are ruled out. In view of the extremely low temperatures near the high-latitude mesopause in summer, several scenarios involving heavy cluster ions and charged aerosol particles are discussed.

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