Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.138...23j&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 138, no. 1, Nov. 1987, p. 23-39. Research supported by the Fundacao de Amp
Astronomy and Astrophysics
Astronomy
7
Current Density, Electron Acceleration, Landau Damping, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Radio Sources (Astronomy), Electrical Resistivity, Magnetic Fields, Plasma Temperature
Scientific paper
Electric current generation by kinetic Alfvén waves (KAW) is discussed for the case of extended radio sources (ERS), in particular, extragalactic jets (EJ). These currents are generated parallel to the background magnetic field due to Landau damping by which KAW accelerate electrons. It is found that the KAW generated currents are in excess of the currents necessary for an EJ to be magnetically self-confined. The authors address the problem of determining the process that can maintain ERS inhomogeneous. They study the stability of a plasma and show it to be subject to the thermal Joule instability. They suggest the thermal Joule instability as the process that maintains ERS inhomogenous. The KAW analysis correlates the important problems of ERS of (re)acceleration, current generation, collimation, and maintenance of inhomogeneities.
Jafelice Luiz C.
Opher Reuven
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