RANDOM VELOCITY-FIELD CORRECTIONS TO THE F-MODE .3. A PHOTOSPHERIC RANDOM FLOW AND CHROMOSPHERIC MAGNETIC-FIELD

The combined effect of a photospheric random flow and a chromospheric magnetic field on the frequencies of the f-mode is studied for a simpl e model of the photosphere and chromosphere. The photosphere and chrom osphere are approximated as inviscid fluids with constant mass densiti es rho1 and rho2. The photosphere is taken to be free of a magnetic fi eld and subject to a random flow and the chromosphere is in static equ ilibrium but permeated by a horizontal magnetic field. Numerical solut ions show that the frequencies of the f-mode depart from the parabola 2=gk(rho1-rho2)/(rho1+rho2)+k2V2(A)rho2/rho1+rho2) at high wavenumbers k.