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In our recent paper, we have obtained a model solution to the problem ofradiation-inefficient accretion flows (RIAFs) in a global magnetic field (socalled, resistive RIAF model), which is asymptotically exact in outer regionsof such flows forming accretion disks. When extrapolated inwardly, the modelpredicts a local enhancement of the vertical Poynting flux within a smallradius that may be regarded as the disk inner-edge. This fact has beeninterpreted as the origin of power source for the astrophysical jetsobservationally well-known to be ejected from this type of accretion disks.Since the accuracy of the solution may become rather poor in such innerregions, however, the ground of this assertion may not seem to be so firm. Inthe present paper, we develop a sophisticated discussion for the appearance ofjet-driving circumstances, based on a much more firm ground by deriving aglobal solution in the same situation. Although the new solution still has anapproximate nature, it becomes exact in the limits not only of large radius butalso of small radius. The analytic results clarify that the electrodynamicpower is gathered by the Poynting flux, from outer main-disk region to feed theinnermost part of an accretion disk. The injected power largely exceeds thelocal supply of work by the fluid motion.

Global Operation of Resistive, Radiation-Inefficient, Accretion Flows in Preparing Jet-Driving Circumstances