... of motions similar to these convective rolls occurs in the moatsurrounding the sunspot (item 9), and it is conceivable that it continues within the sunspot. The existence of small scale convective ... velocities. The contribution of upflows and downflows to such mean is notproportional to the mass going up and down. It depends on the physical propertiesof the upflows and downflows, as well as on the ... physical and thermodynamical information: the damping, the Doppler width, the optical depth, and the macroscopic velocity of the plasma. Combining it with the information carried by Stokes Q and U...