Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...337..954s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 337, Feb. 15, 1989, p. 954-958.
Astronomy and Astrophysics
Astrophysics
1
Mach Number, Particle Acceleration, Shock Wave Propagation, Solar Flares, Solar Protons, Beta Factor, Gamma Rays, Magnetohydrodynamic Waves, Solar Corona, Solar Magnetic Field, Space Plasmas
Scientific paper
A lower limit to the minimum Alfven Mach number M(A) is determined for which a parallel shock could accelerate protons to 10 MeV in 2 s for low coronal conditions in which the density is 9.5 x 10 to the 10th/cu cm, the magnetic field is 56 G, and the temperature is 1.6 x 10 to the 6th K. A lower limit to the time to generate the Alfven waves necessary to scatter the protons back to the shock where they can be accelerated by the shock compression is derived, and the upstream and downstream mean free paths are determined. The actual acceleration time after the Alfven waves are established. The lower limit to M(A) is 2.0.
Brecht Stephen H.
Smith Dean F.
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