Abstract
Spatial structure of a post‐sunrise backscatter plume associated with a plasma bubble has been observed for the first time with the 47–MHz Equatorial Atmosphere Radar (EAR) in West Sumatra, Indonesia (0.20°S, 100.32°E; dip latitude 10.36°N). This plume is likely associated with a geomagnetic storm. It extended from what appears to be the base of the F layer into the topside ionosphere and differed from all plumes previously observed. It was also extended in longitude (i.e., in the east‐west direction), and appeared to involve two spatially separated regions. The plume was first observed around sunrise, close to 200–250 km altitude, but at a time when the E region was not yet sunlit. Spatial maps of the line‐of‐sight Doppler velocity show that there was upward development and westward drift of backscatter regions, indicative of daytime drift conditions. The observations remain puzzling because the plume continued for approximately two hours after E region sunrise.
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