Temporal development of diffuse ion events upstream of the earth's bow shock - The October 31, 1977, event

Details Temporal development of diffuse ion events upstream of the earth's bow shock - The October 31, 1977, event Temporal development of diffuse ion events upstream of the earth's bow shock - The October 31, 1977, event

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.9975s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Dec. 1, 1983, p. 9975-9980.

Physics

15

Bow Waves, Energetic Particles, Interplanetary Magnetic Fields, Ionic Diffusion, Particle Acceleration, Shock Wave Propagation, Gyromagnetism, Ion Temperature, Magnetohydrodynamic Turbulence, Solar Wind, Temporal Distribution

Scientific paper

The origin of the intensity-time profile characteristic of diffuse ion events upstream of the earth's bow shock is investigated. It is believed that the profile results from a rotation of the interplanetary magnetic field that produces as a systematic variation in the connection time of field lines with the bow shock. If the connection time exceeds the time needed to reach equilibrium between the shock acceleration and ion loss processes, a plateau in the ion intensity is formed. The upstream diffusion ion event of October 31, 1977, for which simultaneous magnetic field and ion intensity data have been published is used to test this scenario. This event is analyzed using a two-dimensional Gleeson-Axford equation to describe the shock acceleration process and a model bow shock whose nose serves as a uniform source of ions injected into the acceleration process. Intensity-time profiles are calculated for 30-keV and 120-keV protons for a range of diffusion coefficients using connection times that are based on the shock geometry and the magnetic field data.

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