Collisionless deceleration of stabilized electron beams in the solar corona

Astronomy and Astrophysics – Astronomy

Scientific paper

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Electron Acceleration, Plasma Waves, Plasma-Particle Interactions, Solar Corona, Solar Electrons, Type 3 Bursts, Deceleration, Electron Beams, Magnetohydrodynamic Stability, Solar Flares, Thermal Plasmas, Wave Scattering

Scientific paper

The influence of nonlinear effects on the dispersion of a stabilized electron beam in the corona is investigated. The collisionless deceleration observed by Bazelian et al. (1974), increasing with an increase in the initial beam velocity, indicates the important role of induced scattering of plasma waves on a section of trajectory with a length of order 3 x 10 to the 11th cm. The threshold character of the deceleration is connected with the fact that two regimes of dispersion occur successively when an electron beam is injected into the corona with v greater than 0.35c. A stabilized regime of dispersion, accompanied by beam deceleration to v = about 0.35c, occurs in the initial section of the trajectory due to induced scattering of plasma waves on thermal ions of the corona. Then a quasi-linear regime of dispersion, not accompanied by pronounced deceleration, occurs at v less than 0.35c. Modulation instability evidently plays no significant role in dispersion of the beam on this trajectory, since it results in deceleration of a considerably different character.

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