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Observations of QP radar echo structure consistent with neutral wind shear control of the initiation mechanism
Author(s) -
Pan C. J.,
Larsen M. F.
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl010748
Subject(s) - geology , radar , doppler effect , echo (communications protocol) , middle latitudes , wind shear , sporadic e propagation , range (aeronautics) , altitude (triangle) , atmospheric sciences , geophysics , physics , wind speed , ionosphere , materials science , geometry , mathematics , astronomy , computer network , oceanography , computer science , telecommunications , composite material
The semidiumal variations in quasi‐periodic echo structure parameters associated with midlatitude sporadic E layers observed with the Chung‐Li VHF radar located in Taiwan (24.9 N, 121.2 E; 52 MHz) are presented. The results show that the periodicity decreases with increasing range rate and that the spread of Doppler velocities increases as the altitude coverage of the echoes increases. These characteristics are shown to be consistent with the variations to be expected if the shears in the neutral wind and the variations in the background mean flow are the dominant mechanisms controlling the initiation of the echo structures.