AbstractThe 50-MHz MST radar at Jicamarca Radar Observatory (JRO) can detect atmospheric turbulence on the Bragg scale of 3m in the daytime mesosphere (∼60–85km). Since 2002, the radar was operated for a certain number of days each year collecting 1-min Doppler spectra in four off-vertical (2.5°) beam directions and 150m resolution. The spectral widths have been used to compute the kinetic energy dissipation rate &z.epsiv; due to atmospheric turbulence. A small beam broadening effect has been removed from the observed spectral widths.The daily median energy dissipation rates &z.epsiv; increase from 5 to 30 mW/kg between 67 and 80km, and the eddy diffusivities increase from 3 to 20m2/s, consistent with similar studies conducted by two other large 50-MHz radars in Japan and India. The energy dissipation rates are about the same magnitude as the &z.epsiv; estimates for low-latitudes from a global model and are larger than the averages from rocket observations at high-latitudes, confirming previous comparisons.


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    Title :

    Turbulent kinetic energy dissipation rates and eddy diffusivities in the tropical mesosphere using Jicamarca radar data


    Contributors:
    Guo, L. (author) / Lehmacher, G.A. (author) / Kudeki, E. (author) / Akgiray, A. (author) / Sheth, R. (author) / Chau, J.L. (author)

    Published in:

    Advances in Space Research ; 40 , 6 ; 744-750


    Publication date :

    2007-05-21


    Size :

    7 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English