Matthias Rempel | High Altitude Observatory

Refactoring the MPS/University of Chicago Radiative MHD (MURaM) Model for GPU/CPU Performance Portability Using OpenACC Directives

CPU-GPU strong scaling of a multi-band 288x288x288 dataset

The Coronal Veil

3D view of the simulated corona; bottom panel: magnetogram; back panel: synthetic AIA 211A coronal image; middle vertical plane: volumetric emissivity. Field lines are included for reference.

Efficient numerical treatment of ambipolar and Hall drift as hyperbolic system

Snapshot from a two-dimensional test simulation setup with a 8x8Mm domain reaching from the upper convection zone into the transition region

On the (In)stability of Sunspots

Maps of the magnetic field strength at depth of z = −7.5 Mm beneath the solar photosphere at different times (indicated in red in each panel)

Acoustic-gravity wave propagation characteristics in three-dimensional radiation hydrodynamic simulations of the solar atmosphere

ν − z phase diagrams (cuts at constant horizontal wavenumber at approx. 2 and 4 Mm−1 through the stacks of the layer-by-layer two-dimensional k − ω phase difference diagrams) for various MURaM models

The Dimmest State of the Sun

Measured and modelled total solar irradiance

AAS Nova Features a Recent Publication by Philip Judge

Images to highlight the corrugated surfaces at which the centers of UV lines are formed (close to τ = 1) in MURaM calculations of the upper solar chromosphere

Opposite Polarity Magnetic Fields and Convective Downflows in a Simulated Sunspot Penumbra

Sunspot simulations

A distinct magnetic property of the inner penumbral boundary III. Analysis of simulated sunspots

Radial profiles of continuum intensity (b), magnetic field inclination (c), total magnetic field strength (d), vertical magnetic field strength (e), and horizontal magnetic field strength (f)

On the contribution of quiet Sun magnetism to solar irradiance variations: Constraints on quiet Sun variability and grand minimum scenarios

Plots of magnetic field and TSI with time

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