A method for the treatment of supergranulation advectionby giant cells(Research Note)

摘要

We present a new method for the treatment of the advection of solar supergranulation by giant cells, a large-scale analogue tothe observed property of granule advection by supergranules.Methods. The proposed method is derived from a description of solar convection via spherical harmonics and spectral coefficients,allowing the investigation of the influence of a giant cell component on a realistic supergranule signal.Results. We show that a supergranule pattern derived from real data, as well as a simplified test signal, can be advected by a giant cellcomponent of various sizes.Conclusions. The identified behaviour is in analogy to observed supergranulation patterns, including those based onMDI Dopplergrams, which show wavelike supergranulation patterns, even after the removal of the geometric projection effect. Ourmethod is an important step towards the construction of future models involving supergranule flow patterns advected by a giant cellflow. Nevertheless, additional efforts are required to obtain a final verification of giant cells as a separate component of the solarphotospheric convection spectrum.