Effect of Beam-Plasma Instabilities on Accretion Disk Flares
  We show that a certain class of flare models for variability from accretion disk coronae are subject to beam-plasma instabilities. These instabilities can prevent significant direct acceleration and greatly reduce the variable X-ray emission argued to arise via inverse Compton scattering involving relativistic electrons in beams and soft photons from the disk. 
Vinod Krishan (Indian Institute of Astrophysics), Paul J. Wiita   (Georgia State University), S. Ramadurai (Tata Institute o...