Photospheric motions from an observational point of view: HINODE and SDO satellite observations

Astronomy and Astrophysics – Astrophysics

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Sun Granulation, Sun Photosphere, Sun Rotation

Scientific paper

Thanks to the Solar Optical Telescope onboard HINODE, we mainly aim at the understanding of temporal evolution and spatial characterization of solar granular and supergranular features and their relation with magnetic field. We study the photospheric motions and the network magnetic field interactions using the Tree of Fragmenting Granules (TFGs). The mutual interactions of the TFGs tend to expulse corks outside of them on 3h-4h and concentrate the corks on supergranular scale in approximatively 6h-8h to form the magnetic network. Then, the long living families contribute to form the magnetic network. The measurement of the horizontal velocities by the proper motion of granules over the full Sun with SDO data, allow us to determine, for the first time, the solar differential rotation directly at the central meridian. During the starting phase of the solar cycle 24, the solar differential rotation seems to show some modification which must be confirmed.

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