Physics – Plasma Physics
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..dppgtp110c&link_type=abstract
American Physical Society, Division of Plasma Physics Meeting, November 17-21, 1997, abstract #gTuaP110.
Physics
Plasma Physics
Scientific paper
The existence of collective processes producing rates of transport of angular momentum higher than that predicted by the relevant collisional viscosity has been postulated for years in astrophysics in order to account for the accretion models of both galactic (e.g. X-ray stars) and extragalactic objects. Anomalous transport of angular momentum has been clearly observed in rotating toroidal plasmas with very high temperatures and low degrees of collisionality. Recently the excitation of electrostatic modes, that are capable of inducing momentum transport and have the characteristics predicted by the relevant theory (B. Basu and B. Coppi, J. Geophysics R.) 34, 5316 (1989), have also been observed (J. Willig et al), Bull. Am. Phys. Soc. 41, 1441 (1996). A new type of mode is found for a model configuration (P.S. Coppi and B. Coppi, Bull. Am. Phys. Soc.) 41, 1580 (1996) that includes an effective gravitational force (representing the difference between the actual gravitational force and the centrifugal force in an accretion disk), a magnetic field and a velocity along the field with a gradient transverse to it. The breakdown of the frozen-in-law, due for instance to a finite resistivity, is required for this. The relevance of these modes to rotating toroidal plasmas is pointed out.
Coppi Bruno
Coppi Paolo S.
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