Code for Vortex Flow Analysis (CVFA)

摘要: The Matlab Code for Vortex Flow Analysis (CVFA v1. 1) was developed to identify vortex motion in the solar photosphere. Vortex flows in the solar photosphere are fundamentally important for the generation of magnetohydrodynamic (MHD) waves which propagate to the upper layers of the solar atmosphere. Vortex tubes are formed as coherent magnetic field structures in the solar atmosphere, eg twisted magnetic flux tubes.In this manual, we explain the code of Lagrangian Averaged Vorticity Deviation (LAVD)[1] adopted to identify vortex flows (the center of circulation and 3D vortex boundary) in the solar atmosphere data. Additional algorithmic techniques were developed to check whether a structure detected by the LAVD method is a true vortex or not and how to determine the rotational direction (clockwise or anticlockwise). The applicability of the algorithms was checked by applying our methods to the MuRaM …