Figure 18

Figure 18: Color contours of the ratio of azimuthally averaged magnetic to gas pressure, Pmag∕Pgas. The scale is logarithmic and is the same for all panels; the color maps saturate in the axial funnel. The body of the accretion disk is identified with overlaid density contours at 10− 2, 10− 1.5, 10−1, and −0.5 10 of ρmax(t = 0). The individual plots are labeled by model. In all cases, the magnetic pressure is low (Pmag ∕Pgas ≪ 1) in the disk, comparable to gas pressure (Pmag∕Pgas ∼ 1) in the corona above and below the disk, and high (Pmag∕Pgas ≫ 1) in the funnel region. Image reproduced by permission from [72], copyright by AAS.