Dominant acceleration processes of ambient energetic protons (E greater than or equal to 50 keV) at the bow shock Conditions and limitations

Details Dominant acceleration processes of ambient energetic protons (E greater than or equal to 50 keV) at the bow shock Conditions and limitations Dominant acceleration processes of ambient energetic protons (E greater than or equal to 50 keV) at the bow shock Conditions and limitations

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983p%26ss...31..689a&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 31, June 1983, p. 689-699.

Physics

12

Bow Waves, Energetic Particles, Particle Acceleration, Protons, Shock Wave Interaction, Solar Wind, Explorer 47 Satellite, Explorer 50 Satellite, Geomagnetism

Scientific paper

Energetic proton (E greater than or equal to 50 keV) and magnetic field observations during crossings of the earth's bow shock by the IMP-7 and 8 spacecraft are utilized in order to determine the effect of the bow shock on a preexisting proton population under different configurations of the 'interplanetary magnetic field-bow shock' as well as the conditions for the presence of the bow shock associated energetic proton intensity enhancements. Results indicate that the dominant process for the efficient acceleration of ambient energetic particles to energies exceeding 50 keV is by gradient-B drifting parallel to the induced electric field at quasi-perpendicular bow shock under certain limitations which derive from the finite and curved bow shock surface. It is found that the proton acceleration at the bow shock is most efficient for high values of the upstream magnetic field, high upstream plasma speed, and expanded bow shock fronts; as well as for directions of the induced electric field oriented almost parallel to the flanks of the bow shock. The implications of these observations of bow shock crossings for the source of the energetic proton intensity enhancements are examined.

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