THE SEARCH FOR THE MAGNETIC AND FLOW FIELD PARAMETERS USING RING DIAGRAMS ANALYSIS

M. Ryutova

In collaboration with R. Bogart, F. Hill, D. Haber.

Dispersion of the acoustic waves propagating in strongly inhomogeneous medium reveals some clear properties which can be used in studies of the magnetic and flow field anisotropies both at the solar surface and in subsurface regions. The frequency of the wave interacting with the sheared mass flows and randomly distributed magnetic fields is proportional to $Q_{\alpha\beta}k_{\alpha}k_{\beta}$, where $Q_{\alpha\beta}$ is a tensor whose symmetry is determined by the specific distribution of the magnetic field and plasma flows. We include into consideration the absorption of the acoustic waves evaluating the dependence of frequency on $k^2$. The decomposition of a signal into the planar waves in the presence of spatial inhomogeneities leads to the broadening of the measured ring diagrams. To study the distortions and character of the broadening of the measured ring diagrams we propose to use the decomposition of a signal into the wave-packets which reflect the dependence of wave-vector on the spatial coordinates. The local dispersion relation with anisotropic coefficients will be used in the fitting procedure to infer physical parameters, such as magnetic field, mass flows, sound speed anomalies, and the order of the absorption coefficients.