Stochastic diffusion of interplanetary dust grains orbiting under PoyntingRobertson forces
Abstract
The effects of the fluctuating interplanetary magnetic field (IMF) on charged dust grains orbiting around the sun under radiation pressure and PoyntingRobertson drag forces are examined for general ecliptic and inclined orbits. The FokkerPlanck equation describing the evolution of the charged grain distribution function is reduced to a diffusiontype equation by adopting the constants of the impulsefree motion as variable parameters. The FokkerPlanck coefficients are expressed in terms of the power spectrum of the fluctuating IMF, choosing a relatively simple model of fluctuations superposed on the Parker spiral mean field. For the model, the covariance matrix elements reduce to integrals over the slowlyvarying orbital parameters, giving simple algebraic solutions for circular orbits at arbitrary inclinations.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 October 1985
 Bibcode:
 1985A&A...151..435W
 Keywords:

 FokkerPlanck Equation;
 Interplanetary Dust;
 Interplanetary Magnetic Fields;
 PoyntingRobertson Effect;
 Stochastic Processes;
 Charged Particles;
 Mathematical Models;
 Perturbation Theory;
 Astrophysics