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Upwelling backscatter plumes in growth phase of equatorial spread F observed with the Equatorial Atmosphere Radar
Author(s) -
Yokoyama Tatsuhiro,
Fukao Shoichiro
Publication year - 2006
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 - 10.1029/2006gl025680
Subject(s) - sunset , geology , radar , atmosphere (unit) , upwelling , terminator (solar) , atmospheric sciences , backscatter (email) , geophysics , meteorology , ionosphere , physics , optics , oceanography , telecommunications , computer science , wireless
Upwelling radar backscatter plumes around sunset time associated with equatorial spread F (ESF) are investigated with rapid beam‐scanning capability of the Equatorial Atmosphere Radar (EAR). Nonlinear evolution of plumes which could not be understood by single fixed‐beam radar observations was observationally studied with the EAR for the first time. The rise velocity of the observed plumes ranging from a few tens to a few hundreds of meters per second is similar to nonlinear evolution of plasma bubbles simulated by the previous numerical studies. Importance of sunset terminator transition should be considered because of its comparable rise velocity. Since the rise velocity of the plumes is highly variable, many factors should contribute to growth of plasma bubbles.