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Daytime 150‐km echoes observed with the Equatorial Atmosphere Radar in Indonesia: First results
Author(s) -
Patra A. K.,
Yokoyama T.,
Otsuka Y.,
Yamamoto M.
Publication year - 2008
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 - 10.1029/2007gl033130
Subject(s) - daytime , atmosphere (unit) , geology , latitude , southern hemisphere , atmospheric sciences , geophysics , radar , northern hemisphere , middle latitudes , climatology , physics , meteorology , geodesy , telecommunications , computer science
Results of the daytime 150‐km echoes from 10.36°S magnetic latitude observed using the Equatorial Atmosphere Radar (EAR), which are first of its kind from magnetic southern hemisphere, are presented. The echoing region of 145–165 km shows forenoon descent and afternoon ascent with signal intensity modulation with time resembling a necklace and the Doppler spectra are narrow, which are quite similar to those reported earlier from other locations. Westward and upward/southward irregularity drifts are found to be consistent with daytime background electric fields, providing a tool to investigate low latitude daytime electrodynamics. Detectability of these echoes suggests the absence of strong latitudinal dependence in contrast to the earlier belief, suggesting a possibility of their detection at mid‐latitudes. Also the echoes show zonal anisotropy that is opposite to that observed over Pohnpei. The implications of these observations are discussed in the light of present understanding of 150‐km echoing phenomenon.