Abstract
The presence of flux tubes, visible as Network Bright Points (NBP) at the surface of the Sun outside active regions, disturbs the granular pattern in a similar way as it can be observed in laboratory convection experiments. Around an NBP, granules are smaller, more numerous than around a normal intergranular space without NBP; they are elongated and pointing towards it. Such a perturbation is visible several minutes before the appearance of the NBP, indicating that the magnetic flux, although not yet visible as a bright point, is already interacting with the convection pattern. The perturbation reaches its maximum within one minute after the NBP appearance; and the granular pattern returns to normal just after the NBP disappearance.
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Muller, R., Roudier, T. & Hulot, J.C. Perturbation of the granular pattern by the presence of magnetic flux tubes. Sol Phys 119, 229–243 (1989). https://doi.org/10.1007/BF00146177
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DOI: https://doi.org/10.1007/BF00146177