Fig. 9.

Horizontal flows (spherical velocity components (vϕ, vθ) computed between 9 and 16 UT including the differential rotation under the filament observed at 16:42 UT. The main flow is the solar rotation vector from right to left disrupted by other surface flows (mainly supergranules). The velocity is reduced on the western part of the filament compared to the eastern part. It indicates the presence of convergence along the filament PIL.
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