Accretion Heating in Protostellar Disks
          N. J. Turner, JPL
          H. W. Yorke, JPL
          H. H. Klahr, Max-Planck-Institut fuer Astronomie

          We calculate the heating due to dissipation of magnetic fields generated inside protostellar disks, using three-dimensional MHD calculations. The spatial distribution and time variability of the heating within 1 AU of the young star and the consequences for the spectral energy distribution and chemical evolution are discussed.