- Conference date: 25-30 Jun 1995
- Location: Dana Point, California (USA)
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.
- Magnetic fields
- Solar magnetic fields
- Cumulative distribution functions
- Magnetic anisotropy
- Magnetohydrodynamic waves
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