russell j. hewett

assistant professor

mathematics & CMDA

Publications

We present a faster solver for the 3D Helmholtz equation at high frequencies, including derivations of the preconditioner, and analysis …

The recently developed Hierarchical Poincaré-Steklov (HPS) method is a high-order discretization technique that comes with a direct …

Time-domain discontinuous Galerkin (DG) methods for wave propagation require accounting for the inversion of dense elemental mass …

Traditional time-domain discontinuous Galerkin (DG) methods result in large storage costs at high orders of approximation due to the …

In this work we propose a hybridizable discontinuous Galerkin (hdG) discretization of the high-frequency Helmholtz equation in the …

We present a high order time-domain nodal discontinuous Galerkin method for wave problems on hybrid meshes consisting of both wedge and …

We present a fast solver for the 3D high-frequency Helmholtz equation in heterogeneous, constant density, acoustic media. The solver is …

Optimized finite difference (OFD) coefficients are often used to minimize numerical dispersion and to improve accuracy in finite …

This paper presents SunPy (version 0.5), a community-developed Python package for solar physics. Python, a free, cross-platform, …

We present a domain decomposition solver for the 2D Helmholtz equation, with a special choice of integral transmission condition that …

In this abstract, we present a case study in the application of a time-stepping method, unconstrained by the CFL condition, for …

Wave atoms are a low-redundancy alternative to curvelets, suitable for high-dimensional seismic data processing. This abstract extends …

SunPy is a data analysis toolkit which provides the necessary software for analyzing solar and heliospheric datasets in Python. SunPy …

In this abstract we present a method that allows arbitrary elements of the approximate Hessian to be estimated simultaneously. …

Classical tomographic reconstruction methods fail for problems in which there is extreme temporal and spatial sparsity in the measured …

In order to assess the reliability and consistency of white-light coronagraph measurements, we report on quantitative comparisons …

In this thesis, we propose several advances in the numerical and computational algorithms that are used to determine tomographic …

We present a robust null space method for linear equality constrained state space estimation. Exploiting a degeneracy in the estimator …

Empirical, three-dimensional electron-density maps of the solar corona can be tomographically reconstructed using polarized-brightness …

Flows in the photosphere of solar active regions are turbulent in nature. Because magnetic fields are frozen into the plasma on the …

Magnetohydrodynamic turbulence is thought to be responsible for producing complex, multiscale magnetic field distributions in solar …

This chapter discusses instant messaging (IM) as a valuable digital tool that has influenced business communication practices at least …

SOLAR ACTIVITY MONITORING Here we review the current status of autonomous solar monitoring techniques of relevance to space weather. …

It is already understood that simple monofractal and Fourier studies of magnetic field data give a good, though imperfect, …