Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...380..293s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 380, Oct. 10, 1991, p. 293-301. Research supported by DFG, DOE, and NASA.
Astronomy and Astrophysics
Astrophysics
49
Electric Potential, Magnetic Field Configurations, Magnetohydrodynamic Flow, Solar Flares, Space Plasmas, Earth Magnetosphere, Galactic Rotation, Particle Acceleration
Scientific paper
The electric field component parallel to the magnetic field arising from plasma flows which violate the frozen-in field condition of ideal magnetohydrodynamics is discussed. The quantity of interest is the potential U = integral E parallel ds where the integral is extended along field lines. It is shown that U can be directly related to magnetic field properties, expressed by Euler potentials, even when time-dependence is included. These results are applicable to earth's magnetosphere, to solar flares, to aligned-rotator models of compact objects, and to galactic rotation. On the basis of order-of-magnitude estimates, these results support the view that parallel electric fields associated with nonideal plasma flows might play an important role in cosmic particle acceleration.
Birn Joachim
Hesse Matthias
Schindler Karl
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