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First VHF radar observations of tropical latitude E‐region field aligned irregularities
Author(s) -
Choudhary R. K.,
Mahajan K. K.,
Singh Sachchidanand,
Kumar Keshav,
Anandan V. K.
Publication year - 1996
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 - 10.1029/96gl02625
Subject(s) - daytime , altitude (triangle) , low latitude , radar , geology , diurnal temperature variation , doppler effect , latitude , atmospheric sciences , doppler radar , intensity (physics) , geodesy , physics , optics , geometry , telecommunications , mathematics , astronomy , computer science
Indian MST radar at Gadanki (13.5°N, 79.2°E, 12.5° dip) was operated during July/August 1994, to observe the 3‐m scale size field aligned irregularities associated with the lower E region. Irregularity structure was studied by using height‐time variation of the echo intensity and weighted mean Doppler velocity. In this paper results of three diurnal cycles of observation are presented. Field perpendicular echoes were observed both during daytime and nighttime. A layered irregularity structure extending down to altitude below 86 Km was seen during the nighttime. The daytime structure showed a narrow echoing region with significant downward slope. Doppler velocity was in the range of 20–50 ms −1 , both during day and night and was, in general, consistent with the slope of scattering structure observed in the height‐time‐intensity plots.