Report on New Mission Concept Study: Stereo X-Ray Corona Imager Mission
Studies of the three-dimensional structure and dynamics of the solar corona have been severely limited by the constraint of single viewpoint observations.
corona↗
Engineering topics
Liewer, P.
Publications and source records attributed to Liewer, P..
The Effect of Neutrals on the Global Heliosphere and Interplanetary Shock Propagation Time to the Heliopause
A two-dimensional time-dependent two-fluid hydrodynamic model has been used to study numerically the effect of interstellar neutrals on the size and structure of the heliosphere.
intersteller↗
3-D Monte Carlo Particle-in-Cell Simulations of Ion Thruster Plumes Under Ground Test and Flight Conditions
Ion thrusters are valued as a high-specific impulse class of space propulsion system.
ion thrusters exhaust plume charge-exchange collis↗
Modeling Ion Thruster Plumes Under Flight and Ground Test Conditions
Ion thrusters are valued as a high-specific impulse class of space propulsion system.
ion thrusters exhaust plume ionized gas low-energy↗
3-D Electromagnetic Monte Carlo Particle-in-Cell Simulations on MIMD Parallel Computers
Computer particle simulation has become a standard research tool in space plasma physics research.
computer↗
3D Electromagnetic Plasma Particle Simulations on the Intel Delta Parallel Computer
A three-dimensional electromagnetic PIC code has been developed on the 512 node Intel Touchstone Delta MIMD parallel computer. This code is based on the General Concurrent PIC algorithm which uses a domain decomposition to divide the computation among the processors. The 3D simulation domain can be partitioned into 1-, 2-, or 3-dimensional subdomains. Particles must be exchanged between processors as they move among the subdomains.
PIC↗
3D Electromagnetic Plasma Particle Simulations on a MIMD Parallel Computer
A three dimensional electromagnetic PIC code has been developed on the 512 node Intel Touchstone Delta MIMD parallel computer.
MIMD PIC code electromagnetic plasma plasma partic↗
3-D Electromagnetic Monte Carlo Particle-in-Cell Simulations of Critical Ionization Velocity Experiments in Space
Although the existence of the critical ionization velocity (CIV) is known from laboratory experiments, no agreement has been reached as to weather CIV exists in the natural space environment.
critical ionization velocity (CIV)↗
3D Electromagnetic Plasma Particle Simulations on a MIMD Parellel Computer
This paper describes computer particle simulation in plasma physics research; also discussed are the results of plasma wave radiation by a moving current source in a magnetized plasma.
N/A↗
Performance of a plasma fluid code on the Intel parallel computers
One approach to improving the real-time efficiency of plasma turbulence calculations is to use a parallel algorithm. A parallel algorithm for plasma turbulence calculations was tested on the Intel iPSC/860 hypercube and the Touchtone Delta machine. Using the 128 processors of the Intel iPSC/860 hypercube, a factor of 5 improvement over a single-processor CRAY-2 is obtained. For the Touchtone Delta machine, the corresponding improvement factor is 16. For plasma edge turbulence calculations, an extrapolation of the present results to the Intel (sigma) machine gives an improvement factor close to 64 over the single-processor CRAY-2.
Lynch, V. E.↗
Hypercube matrix computation task
The Hypercube Matrix Computation (Year 1986-1987) task investigated the applicability of a parallel computing architecture to the solution of large scale electromagnetic scattering problems. Two existing electromagnetic scattering codes were selected for conversion to the Mark III Hypercube concurrent computing environment. They were selected so that the underlying numerical algorithms utilized would be different thereby providing a more thorough evaluation of the appropriateness of the parallel environment for these types of problems. The first code was a frequency domain method of moments solution, NEC-2, developed at Lawrence Livermore National Laboratory. The second code was a time domain finite difference solution of Maxwell's equations to solve for the scattered fields. Once the codes were implemented on the hypercube and verified to obtain correct solutions by comparing the results with those from sequential runs, several measures were used to evaluate the performance of the two codes. First, a comparison was provided of the problem size possible on the hypercube with 128 megabytes of memory for a 32-node configuration with that available in a typical sequential user environment of 4 to 8 megabytes. Then, the performance of the codes was anlyzed for the computational speedup attained by the parallel architecture.
Calalo, R.↗