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Title:
Pitch angle diffusion in the Jovian magnetodisc
Authors:
BIRMINGHAM, T. J.
Affiliation:
AA(NASA, Goddard Space Flight Center, Laboratory for Extraterrestrial Physics, Greenbelt, MD)
Journal:
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, May 1, 1984, p. 2699-2707.
Publication Date:
05/1984
Category:
Lunar and Planetary Exploration; Jupiter
Origin:
STI; LPI [AN-840727%J]
NASA/STI Keywords:
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)
LPI Keywords:
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 MISSIONS, PHASES
Bibliographic Code:
1984JGR....89.2699B

Abstract

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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