Stochastic acceleration of cometary pickup ions - The classic leaky box model

Details Stochastic acceleration of cometary pickup ions - The classic leaky box model Stochastic acceleration of cometary pickup ions - The classic leaky box model

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341..493b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 1, 1989, p. 493-496. Research supported by NASA.

Astronomy and Astrophysics

Astrophysics

13

Cosmic Rays, Giacobini-Zinner Comet, Ion Temperature, Magnetohydrodynamic Turbulence, Magnetohydrodynamic Waves, Particle Acceleration, Bow Waves, Interplanetary Medium, Planetary Magnetospheres, Comets, Acceleration, Pickup, Ions, Models, Magnetohydrodynamics, Giacobini-Zinner, Downstream, Cometosheath, Magnetic Effects, Turbulence, Scattering, Diagrams, Calculations, Energy, Spectra, Comparisons, Ice Mission, Spacecraft Observations

Scientific paper

The acceleration of cometary pickup ions by magnetohydrodynamic waves at P/Giacobini-Zinner is examined in a model where acceleration predominantly occurs downstream of the bow shock throughout the cometosheath where intense magnetic turbulence exists. The mean free path for scattering by the magnetic fluctuations in this region is less than the characteristic dimension of the cometosheath so that pickup ions are rendered isotropic and energized by a modest amount in the process. This principal loss mechanism for the ions is spatial diffusion out of the acceleration region moderated by the self-same accelerating waves. This particular feature constrains the model in a way that the predicted ion spectrum is uniquely determined by the power spectrum of the magnetic turbulence. At both P/Giacobini-Zinner and P/Halley, the turbulence is non-Kolmogoroff with a spectral index of 2 resulting in an ion spectral behavior that is approximately an exponential in ion speed, consistent with a recent analysis of the Giacobini-Zinner data (see Richardson et al.).

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