Pitch angle diffusion in the Jovian magnetodisc

Details Pitch angle diffusion in the Jovian magnetodisc Pitch angle diffusion in the Jovian magnetodisc

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.2699b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, May 1, 1984, p. 2699-2707.

Statistics

Computation

57

Astronomical Models, Jupiter (Planet), Particle Diffusion, Pitch (Inclination), Planetary Magnetic Fields, Planetary Magnetospheres, Charged Particles, Diffusion Coefficient, Magnetic Moments, Mathematical Models, Ring Currents, Saturn (Planet), Jupiter, Magnetosphere, Disk, Diffusion, Magnetic Fields, Shape, Data, Charged Particles, Energy, Motion, Magnetic Properties, Magnetic Moment, Procedure, Techniques, Calculations, Mathematical Models, Density, Ions, Protons, Electrons, Pioneer Missions, Voyager Mis

Scientific paper

Using a linear approximation to the field variation and a mathematical technique for distorting the orbit integration into the complex gyrophase plane, a formula is derived for the nonadiabatic change in magnetic moment. This change varies as the cosine of the particle gyrophase at the equator, so that if a particle traverses the equator several times with different values of this gyrophase, it suffers randomly correlated values for the nonadiabatic change in magnetic moment. The algebraic formula for this nonadiabatic change is found to be in excellent agreement with previous numerical computations. The phase space density, averaged over several bounce periods, is found to satisfy a diffusion equation in pitch angle. The diffusion coefficient is dependent on particle energy, pitch angle, and the field line along which the particles are moving.

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