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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: Secondary instability generated on the equatorial plasma bubbles wall due to an interaction with midnight brightness wave

Fig. 4

a Unwarped image taken at 03:51:58 UT. The black rectangle indicates the selected region of the EPB B3 for spectrum analysis. b Unwarped image taken at 04:13:18 UT, and selected region for spectrum analysis. c Power spectrum PSx(ky) for the selected region of the EPB B3 at 03:51:58 UT. d Power spectrum PSx(ky) for the selected region of the EPB B3 at 04:13:18 UT. Black arrows indicate the north–south characteristic scale of the KHI vortices. Black continuous lines indicate the spectral slope

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