Steady-State Hybrid Simulations of Quasi-Parallel Shocks
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**Session 40 -- Computational Astrophysics I**
*Display presentation, Wednesday, 1, 1994, 9:20-6:30*

## [40.07] Steady-State Hybrid Simulations of Quasi-Parallel Shocks

*Lee Bennett (NCSU), Donald C. Ellison (NCSU)*
We have developed a means of producing a steady-state hybrid simulation of a
collisionless shock. The shock is stopped in the simulation box by making the
downstr
eam
boundary partially transparent, and once stopped, the simulation can be run
for an
arbitrary time with a fixed box size and a fixed number of simulation
particles. Gros
s
properties associated with the shock, such as the particle distribution
function
(including energetic particles produced by Fermi acceleration) and the flow
speed profile, are shown to be constant (except for statistical variations)
over 100's of gyroperiods, implying that any
microphysical processes responsible for particle heating and/or injection
into the
Fermi mechanism, are constant when averaged over a few gyroperiods.
In addition, we have calculated mean free paths for particles upstream
and downstream of the shock and used these values as input for a
steady-state Monte Carlo simulation to yield comparisons between the two
simulation methods.

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