Equatorial plasma bubble
Different times of the year and location have different frequencies of occurrence. In Northern Australia, the most common times are February to April and August to October, when a plasma bubble is expected every night. Plasma bubbles have dimensions around 100 km. Plasma bubbles form after dark when the sun stops ionising the ionosphere. The ions recombine, forming a lower density layer. This layer can rise through the more ionised layers above via convection, which makes a plasma bubble. The bubbles are turbulent with irregular edges.
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