Figure 3From: Airglow-imaging observation of plasma bubble disappearance at geomagnetically conjugate pointsIonograms obtained at Darwin, Australia, on 8 August 2002 from (a) 15:35UT to (f) 20:00UT. The plasma bubble disappeared at approximately 1900 UT in the 630-nm airglow images, while the spread-F signature was continuously observed until 2000 UT.Back to article page