Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...333..735b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 333, Oct. 15, 1988, p. 735-742. USAF-supported research.
Astronomy and Astrophysics
Astrophysics
50
Astronomical Models, Electric Field Strength, Electrodynamics, Galactic Nuclei, Interstellar Magnetic Fields, Molecular Clouds, Interstellar Matter, Ohmic Dissipation, Stellar Luminosity, Stellar Mass Accretion
Scientific paper
Molecular clouds moving at Keplerian velocities can induce strong electric fields in ionized regions near the Galactic center. The v x B induced field can drive currents over equivalent circuits of about 100 pc along the highly ordered magnetic fields, B of about 0.001 G. Such current paths drive low-level ion acoustic turbulence, providing a resistance in the circuit. Small magnetic pinches form which are generally kink unstable but which can organize into larger, long-lived structures. Ohmic losses are energetically important in the molecular clouds, where high-density regions should be most luminous. Electrons can accelerate in the induced fields to relativistic energies, yielding the radio luminosity. Electrodynamic flares may occur on year time scales. Such electrodynamic deceleration of clouds can powerfully increase accretion toward galactic centers and enhance their luminosities.
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