Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...245...48l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 245, no. 1, May 1991, p. 48-56.
Astronomy and Astrophysics
Astrophysics
18
Accretion Disks, Active Galactic Nuclei, Magnetic Field Reconnection, Plasma Heating, Plasma Turbulence, Shock Wave Propagation, Current Sheets, Electron Acceleration, Plasma Waves, Wave Interaction
Scientific paper
Electron heating by microscopic plasma processes in accretion disks is examined. In a turbulent, magnetized accretion disk in the vicinity of a supermassive central object magnetic reconnection and quasi-perpendicular shocks could provide plasma turbulence which preferentially heat the electrons. Magnetic reconnection occurs in current sheets where electrons are effectively accelerated. These electrons propagate as a beam into the ambient medium. In quasi-perpendicular shocks, the excited plasma waves are dissipated by wave-electron interactions. Under the special conditions of accretion disks both mechanisms preferentially heat the electrons. Such collective plasma processes offer the possibility to explain the heating of an optically and geometrically thin, collision free-accretion disk to the temperature resulting from hydrodynamical models.
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