Abstract
We report, for the first time, simultaneous two‐dimensional observations of 630‐nm airglow depletions and radar backscatter from field‐aligned irregularities (FAI) associated with equatorial plasma bubbles. Spatial distributions of backscatter were obtained by performing east‐west scans with the 47‐MHz Equatorial Atmosphere Radar (EAR) in West Sumatra, Indonesia. A 630‐nm airglow depletion, caused by a plasma bubble, was simultaneously observed with an all‐sky airglow imager. Both the airglow depletion and backscatter region appeared as band‐like structure elongated in the meridional direction with a zonal width of about 100 km. To compare the spatial structures of backscatter with that of airglow depletion, the backscatter was projected onto a horizontal plane at 250‐km altitude. Backscatter was found to occur within the entire airglow‐depleted region.
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