Physics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..dppqp1002c&link_type=abstract
American Physical Society, 44th Annual Meeting of the Division of Plasma , abstract #QP1.002
Physics
Scientific paper
Spin characterizes a large variety of entities in the Universe including celestial objects, particles, accretion disks, current density disks, collective modes, viewed as quasi particles of gravitational and electrodynamic plasmas, and well confined laboratory plasmas. A major issue is the identification of the processes that make the rate of momentum transport consistent with the observations. A recently discovered relevant phenomenon is that of the "spontaneous rotation" of toroidal plasmas. This is interpreted (B. Coppi, Nucl. Fus.), 42, 1 (2002). by the excitation of different characteristic plasma modes that transport angular momentum with one sign toward the center of the plasma column and to the surrounding material wall with the opposite sign. Considering that jets emerge from accretion disks in regions where the magnetic energy density is significant relative to the thermal energy density the plasma collective modes, which can produce the needed outward momentum transport are driven by the combined effects of the finite plasma temperature and of the gradient of the local rotation frequency and are mesoscopic in that they involve both macroscopic and microscopic scale distances (B. Coppi and P.S. Coppi, Phys. Rev. Lett.), 87, 051101, (2001).. In the ideal MHD approximation, these modes have characteristic singularities related to relevant plasma frequencies.
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