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Fig. 8

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2D cuts on the inferred photosphere of Betelgeuse on December 12, 2013 (left, Narval data) and February 10, 2021 (right, NeoNarval data). Both cut planes are parallel to the central meridian plane of the disk. Several limb-bending structures are seen in one and the other images, which we interpret as plasma slowing down as it rises, subject to gravity. Also visible are two structures showing a radial profile, which we interpret as presenting a velocity constant with height, therefore implying the presence of a vertical force countering gravity. The colored dots identify the two granules out of the four followed in Fig. 9 which are visible in the image, though projected.

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