Solar wind ions accelerated to 40 keV by shock wave disturbances

Details Solar wind ions accelerated to 40 keV by shock wave disturbances Solar wind ions accelerated to 40 keV by shock wave disturbances

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85..744g&link_type=abstract

Journal of Geophysical Research, vol. 85, Feb. 1, 1980, p. 744-752. Research supported by the U.S. Department of Energy; Bundes

Physics

4

Energetic Particles, Interplanetary Medium, Particle Acceleration, Shock Waves, Solar Wind, Collisionless Plasmas, International Sun Earth Explorers, Ion Temperature, Plasma Diagnostics, Stochastic Processes

Scientific paper

Observations in the solar wind with the LASL/MPI fast plasma experiment on ISEE 1 and 2 reveal the common presence of ions with energies extending from 100 eV up to at least 40 keV in a broad region, typically 10 million kilometers wide, following interplanetary shocks. Peak differential fluxes up to 5000/sq cm s sr keV at 28 keV are observed either at the shock or within the first 1.5 hours following shock passage. In the solar wind frame the distribution function of these ions is roughly isotropic, peaks near zero velocity, and above 5 keV can adequately be characterized as power law in energy with a spectral index of 2.7. The effective 'temperature' of these ions generally exceeds 100 million K. These suprathermal interplanetary ions are almost certainly solar wind ions which have been accelerated by some mechanism associated with the shock wave disturbance. Present evidence leads the authors to favor stochastic particle acceleration involving electrostatic and/or electromagnetic turbulence in the postshock flow.

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