SC13 Home > SC13 Schedule > SC13 Presentation - Vlasiator: Hybrid-Vlasov Simulation Code for the Earth's Magnetosphere

SCHEDULE: NOV 16-22, 2013

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Vlasiator: Hybrid-Vlasov Simulation Code for the Earth's Magnetosphere

SESSION: Research Poster Reception

EVENT TYPE: Posters, Electronic Posters, and Education Posters

TIME: 5:15PM - 7:00PM

AUTHOR(S):Sebastian von Alfthan, Dimitry Pokhotelov, Yann Kempf, Ilja Honkonen, Sanni Hoilijoki, Arto Sandroos, Minna Palmroth

ROOM:Mile High Pre-Function

ABSTRACT:
Here we present Vlasiator, the first global magnetospheric simulation code based on a hybrid-Vlasov description of plasma. Ions are represented by a six-dimensional distribution function, while electrons are modeled as a charge neutralizing fluid. To propagate the distribution function we use a finite volume method, coupled to an upwind constrained transport method for propagating electromagnetic fields. We have parallelized the code with a two-level MPI and OpenMP scheme, and it scales well to tens of thousands of cores. The hybrid-Vlasov approach is enabled through a novel sparse representation of the distribution function that reduces the problem size by more than two orders of magnitude. The capabilities of the code are demonstrated by reproducing key features of the collisionless bowshock in a global five-dimensional magnetospheric simulation. Vlasiator produces the first uniformly discretized ion velocity distribution functions with quality comparable to spacecraft measurements, opening up new opportunities for studying the Earths magnetosphere.

Chair/Author Details:

Sebastian von Alfthan - Finnish Meteorological Institute

Dimitry Pokhotelov - Department of Physics, University of Helsinki

Yann Kempf - Finnish Meteorological Institute, University of Helsinki

Ilja Honkonen - Finnish Meteorological Institute, University of Helsinki

Sanni Hoilijoki - Finnish Meteorological Institute, University of Helsinki

Arto Sandroos - Finnish Meteorological Institute

Minna Palmroth - Finnish Meteorological Institute

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