Matthias Rempel

Three-dimensional modeling of chromospheric spectral lines in a simulated active region

Simulated images of Ca II 8542 Å, Ca II K, Mg II k, and H
Friday, May 3, 2019

Recently, the radiative magnetohydrodynamic (R-MHD) code MURaM was extended to include the corona. The code was used to simulate a bipolar active region with additional parasitic flux emergence near one of the sunspots that produced a flare.

First computer model to simulate a realistic solar flare

Image depicting a solar flare or cme

A team of scientists has, for the first time, used a single, cohesive computer model to simulate the entire life cycle of a solar flare.

Transport of Internetwork Magnetic Flux Elements in the Solar Photosphere

Graph of displacement probability distributions
Tuesday, October 23, 2018

The motions of small-scale magnetic flux elements in the solar photosphere can provide some measure of the Lagrangian properties of the convective flow.

Evershed and Counter-Evershed Flows In Sunspot MHD Simulations

Field line connectivity and associated pressure perturbation image
Wednesday, December 13, 2017

There have been a number of reports in the literature of counter-Evershed flows in well developed sunspot penumbrae, i.e. flows directed towards the umbra.

Small-scale dynamo Simulations

Magnetic field amplification in exploding granules image
Wednesday, December 13, 2017

Magnetic field amplification in exploding granules and the role of deep and shallow recirculation

Nature of Grand Minima and Maxima from Fully Non-Linear Flux-Transport Dynamos

Identified Grand Minima and Maxima
Thursday, September 7, 2017

We aim to investigate the nature and occurrence characteristics of grand solar minimum and maximum periods, which are observed in the solar proxy records such as 10Be and 14C, using a fully non-linear Babcock-Leighton type flux transport dynamo including momentum and entropy equations.

Slow appearance of sunspots challenges theory

HAO along with researchers from the Max Planck Institute for Solar System Research, The University of Göttingen, and NorthWest Research Associates have now shown that magnetic flux concentrations forming active regions on the sun emerge at a rate much slower than predicted by the prevailing curre

Matthias Rempel

Dr. Matthias Rempel is a Senior Scientist in the High Altitude Observatory at the National Center for Atmospheric Research. His research area is solar physics, with special emphasis on theoretical modeling of the solar interior and the solar photosphere.

Super-Resolution Making Order Out of Chaos

Real Sun magnetic simulation
Friday, March 25, 2016

A paper was published today in Science by a team from the National Center for Atmospheric Research (NCAR), Chiba University in Japan, and the University of Tokyo. It is titled "Large-scale magnetic fields at high Reynolds numbers in magnetohydrodynamic simulations."

A new Solar Superstorms documentary

NCSA Press Release–Several scientists from HAO at NCAR, including Yuhong Fan, Mark Miesch, Nick Nelson, and Matthias Rem


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