Dynamics of the photosphere along the solar cycle from SDO/HMI

摘要: Context. As the global magnetic field of Sun has an activity cycle, one expects to observe some variation dynamical properties flows visible in photosphere. Aims. We investigate flow during solar cycle by analysing SDO/HMI observations continuum intensity, Doppler velocity and longitudinal field. Methods. first picked data at disk center 6 yr along with a 48-h time step order study overall evolution intensity Then we focused on thirty 6-h sequences quiet regions without any remnant separated months, summer winter, when latitude B0 is close zero. The horizontal was derived from local correlation tracking technique over view 216.4 Mm × located center. Results. Our measurements show stability between meso- supergranular scales cycle. Conclusions. network field, produced locally independently large scale dynamo, together contrast, vertical flows, seem remain constant