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Geophysical Monograph Series



  • Plasma waves—Congresses
  • Magnetospheres—Congresses
  • Comets—Congresses

Index Terms

  • 6025 Planetology: Comets and Small Bodies: Interactions with solar wind plasma and fields
  • 6050 Planetology: Comets and Small Bodies: Plasma and MHD instabilities
  • 7807 Space Plasma Physics: Charged particle motion and acceleration



Particle scattering and acceleration in a turbulent plasma around comets

T. Terasawa

Efficient particle acceleration is believed to occur in the region around comets. We first review several possibilities for the acceleration process. For a detailed study, we choose the second-order Fermi acceleration. We shortly summarize the results of quasi-linear theory on this acceleration. The theoretical results are then compared with those of test particle simulations, in which particle (ion) motions are traced in hydromagnetic turbulence of given amplitude and spectra. If the energy density of the turbulent magnetic field is less than ≈10% of that of the background magnetic field, the quasi-linear results fit the simulation results well. It is found that nonlinear effects tend to enhance the acceleration rate when the amplitude of turbulence becomes stronger.

Citation: Terasawa, T. (1989), Particle scattering and acceleration in a turbulent plasma around comets, in Plasma Waves and Instabilities at Comets and in Magnetospheres, Geophys. Monogr. Ser., vol. 53, edited by B. T. Tsurutani and H. Oya, pp. 41–49, AGU, Washington, D. C., doi:10.1029/GM053p0041.

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