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We examine the morphology of magnetic structures in thin plasma accretiondiscs, generalizing a stationary ideal MHD model to the time-dependentvisco-resistive case. Our analysis deals with small scale perturbations to acentral dipole-like magnetic field, which give rise -- as in the ideal case --to the periodic modulation of magnetic flux surfaces along the radialdirection, corresponding to the formation of a toroidal current channelssequence. These microstructures suffer an exponential damping in time becauseof the non-zero resistivity coefficient, allowing us to define a configurationlifetime which mainly depends on the midplane temperature and on the lengthscale of the structure itself. By means of this lifetime we show that themicrostructures can exist within the inner region of stellar discs in a preciserange of temperatures, and that their duration is consistent with localtransient processes (minutes to hours).

Non-stationary Magnetic Microstructures in Stellar Thin Accretion Discs