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Radioscience Seminars

EE 350 Radioscience Seminar
Professor Umran S. Inan
Winter 2005-2006

Date: Wednesday, March 8, 2006
Time: 4:15 PM – Refreshments at 4:00

Recent Advances in the Perfectly Matched Layer Absorbing Boundary Condition with Applications to Geophysics and Space Science
Michael William Chevalier
EE/Star Lab, Stanford University

The Perfectly Matched Layer (PML) absorbing boundary condition was introduced by Berenger (1993) and Chew and Weedon (1994) as a means for truncating Finite-Difference Time-Domain (FDTD) and Finite-Difference Frequency Domain (FDFD) lattices in order to accurately simulate electromagnetic antenna and scattering problems in isotropic media. In the ionosphere and magnetosphere, where the dominant medium is a magnetized plasma, numerous interesting electromagnetic wave phenomena occur. Many of these would be well suited for analysis by the FDTD and/or FDFD methods, however, until recently the PML had not been efficiently extended nor capable, in some cases, to truncate domains containing magnetized plasma. In this talk, we develop two methods for extending Chew's formulation to robustly and efficiently match linear magnetized plasma as well as any linear media. We then the derive numerical reflection coefficient for the new PMLs in order to quantify their error as well as optimize them.
FDTD simulations including pulsed propagation in the earth-ionsphere waveguide and a source radiating in a magnetized plasma will be shown to demonstrate the effectiveness of the new PMLs.