1. Magnetically Heated Accretion Disk Coronae Expect strong B: Keplerian Shear+convection Bouyancy Loops Observe: Power law flickering Emission Lines (Horne & Saar) Jets Ueno et al.

2. Early Scenario Galeev, Rosner & Vaiana Black Hold Disk: Cygnus X-1 Scaling like solar coronal loops Thermal Conduction + Radiation or Compton Cooling B in equipartion within disk T ~ 5x10 8, n e ~ 10 19

3. Magnetorotational Instability Balbus & Hawley Viscosity >> Molecular Convection doesn’t work Miller & Stone Poynting flux ~ 25% E diss Sheets? Low β Corona

4. Nanoflares? Pavlidou et al. Cellular automaton model Naturally gives power law Angular momentum transfer by Reconnection in corona alone CMEs?? Strong winds sometimes Can collimate flow (Williams)