Evolution of the particle injection at propagating interplanetary shocks

Details Evolution of the particle injection at propagating interplanetary shocks Evolution of the particle injection at propagating interplanetary shocks

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15..393w&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 15, no. 8-9, p. 393-396

Computer Science

6

Interplanetary Magnetic Fields, Interplanetary Space, Particle Acceleration, Protons, Shock Wave Interaction, Shock Wave Propagation, Shock Waves, Data Reduction, Energy Spectra, Forbush Decreases, Shock Wave Profiles, Wave-Particle Interactions

Scientific paper

For 16 proton events in the 10 MeV energy range associated with interplanetary shocks we guesstimated the particle mean free paths (mfp) and the radial development of the particle injection at the shock using a numerical solution of the focused transport equation. The particle mfps derived by this method typically are larger than the mfps derived from the magnetic field power spectra and are comparable to the ones found in previous studies of solar energetic particles events. The evolution of the shocks acceleration efficiency can be highly variable with efficiencies varying as ralpha where alpha is between -2 and 2. In some cases alpha can be as large as 5 or more. These latter events show distinct features, in particular quasi-exponential particle increases and extremely weak proton spectra with spectral indices around -5 for protons with energies of a few to a few tens of MeV. In the 7 events with sufficient quality of the magnetic field data we find no indication of an increase of turbulence in the upstream medium at wave numbers in resonance with the particles.

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