Adiabatic Fermi acceleration of energetic particles between converging interplanetary shock waves

Details Adiabatic Fermi acceleration of energetic particles between converging interplanetary shock waves Adiabatic Fermi acceleration of energetic particles between converging interplanetary shock waves

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81...51l&link_type=abstract

Journal of Geophysical Research, vol. 81, Jan. 1, 1976, p. 51-59. NSF-sponsored research;

Statistics

Computation

6

Adiabatic Conditions, Interplanetary Medium, Particle Acceleration, Shock Wave Interaction, Solar Cosmic Rays, Plasma-Particle Interactions, Solar Cycles, Solar Wind

Scientific paper

The process of adiabatic acceleration of cosmic rays between two converging interplanetary shocks through the first-order Fermi mechanism is analyzed quantitatively, taking into account the nature of interplanetary shock-wave propagation. In the formal computational model, the net evolution of the particle flux is determined by the balance between the acceleration of particles reflected from the moving shock waves and the loss of those particles which pass through the shocks. The theoretical results are found to agree well with observations of the unusual ground-level event of August 4, 1972, and it is shown that the observed abnormalities are a natural consequence of the analyzed process. An intensive search for additional abnormal events indicates that the necessary conditions for observing ground-level events representing the present acceleration process have occurred only twice over a period of two solar cycles; an abnormal event was observed on both occasions.

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