Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..382..311d&link_type=abstract
Proceedings of the eigth international solar wind conference: Solar wind eight. AIP Conference Proceedings, Volume 382, pp. 311
Physics
Solar Wind Plasma, Sources Of Solar Wind, Particle Emission, Solar Wind, Plasma Simulation
Scientific paper
Gyrotropic symmetry is usually assumed in measurements of electron distribution functions in the heliosphere. This prevents the calculation of a net current perpendicular to the magnetic field lines. Previous theoretical results derived by one of the authors for a collisionless plasma with isotropic electrons in a strong magnetic field have shown that the excitation of MHD modes becomes possible when the external perpendicular current is non-zero. We consider then that any anisotropic electron population can be thought of as ``external'', interacting with the remaining plasma through the self-consistent electromagnetic field. From this point of view any perpendicular current may be due to the anisotropic electrons, or to an external source like a stream, or to both. Two alternatives to determinate the transverse current are suggested: i) from non gyrotropic distribution functions and ii) from Ampere's law and a stochastic model of magnetic field fluctuations in the solar wind.
Alexander Pedro
de la Torre Alejandro
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