Plasma field characteristics of directional discontinuities in the interplanetary medium

Details Plasma field characteristics of directional discontinuities in the interplanetary medium Plasma field characteristics of directional discontinuities in the interplanetary medium

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82...10s&link_type=abstract

Journal of Geophysical Research, vol. 82, Jan. 1, 1977, p. 10-14.

Physics

5

Cosmic Rays, Discontinuity, Interplanetary Medium, Magnetic Field Configurations, Magnetohydrodynamic Stability, Solar Wind Velocity, Diffusion Coefficient, Magnetic Variations, Mariner 5 Space Probe, Pioneer 6 Space Probe, Plasma Flux Measurement

Scientific paper

The paper examines plasma and magnetic-field changes occurring across 1359 directional discontinuities taken from interplanetary data spanning almost four solar rotations. The plasma field characteristics of these events exhibit a distinct variation with large-scale solar-wind velocity. At low velocities, tangential discontinuities appear to predominate. At higher velocities, a substantial and increasing fraction of directional discontinuities exhibits the plasma field properties expected of outwardly propagating rotational discontinuities. The results of Sari (1972, 1975) and of the present study suggest that in the calculation of propagation diffusion coefficients for low-energy cosmic rays, the effects of directional discontinuities should be subtracted from the magnetic fluctuation spectrum during relatively quiet wind conditions. It is not clear that such subtraction is necessary during more disturbed periods.

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