Drift motion and perpendicular diffusion of energetic particles in interplanetary space based on spacecraft data

Details Drift motion and perpendicular diffusion of energetic particles in interplanetary space based on spacecraft data Drift motion and perpendicular diffusion of energetic particles in interplanetary space based on spacecraft data

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982ap%26ss..86..197m&link_type=abstract

Astrophysics and Space Science, vol. 86, no. 1, Aug. 1982, p. 197-207. Research supported by the Science and Engineering Resear

Astronomy and Astrophysics

Astrophysics

11

Energetic Particles, Interplanetary Magnetic Fields, Particle Diffusion, Astronomical Models, Computerized Simulation, Diffusion Coefficient, Drift Rate, Steady State

Scientific paper

A realistic model of the interplanetary magnetic field (IMF) is constructed based on measurements taken by Pioneer 10 magnetometer at 5 AU. Energetic particle (0.1-100 MeV) propagation in this field is studied by a computer simulation of its motion in order to calculate the perpendicular diffusion coefficient and the average drift velocity of an ensemble of particles. Determinations of the perpendicular diffusion coefficient lie in the range 3 x 10 to the 19th - 8 x 10 to the 20th sq cm/s for the energies considered, and they show that perpendicular diffusion may be an important process at these heliodistances when compared with parallel diffusion results obtained by similar techniques, contrary to what was previously thought. Drift velocity calculations are very close to predictions of guiding center theory (within 30%) suggesting that this theory can be applied in the IMF. This result shows that gradient and curvature drifts can be present even in a highly perturbed field and thus they can have some influence in cosmic ray modulation.

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