[Kallenrode 1995 a]
Particle acceleration at interplanetary shocks -
observations at a few tens of KeV vs some tens of MeV
M. B. Kallenrode.
Particle acceleration at interplanetary shocks --
observations at a few tens of KeV vs some tens of MeV
Advances in Space Research, 15, 375-384.
1995
Contents
The passage of interplanetary shocks frequently is associated with
enhancements in energetic particles from supra-thermal energies up to
energies of a few tens of MeV or even a hundred MeV.
While these observations clearly indicate that interplanetary shocks are
capable of efficient proton acceleration, the acceleration mechanism(s) are not
completely understood.
For the 'low energy' proton populations up to a few hundreds of keV,
the observations are in good agreement with shock-drift
acceleration at quasi-perpendicular and diffusive shock acceleration at
quasi-parallel shocks.
Both mechanisms, however, are not expected to be efficient accelerators for
the higher energetic particle population.
We will review observations of accelerated particles in different energy
ranges, the different types of intensity profiles observed in connection with
the passage of interplanetary shocks, and attempts to correlate the properties
of the particle event with shock parameters to identify the crucial
parameter(s) that determine the acceleration.
Special attention will be paid to the similarities and differences between
lower and higher energetic particles.
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