The Pencil Code is a highly modular physics-oriented simulation code that can be adapted
to a wide range of applications. It is primarily designed to solve partial differential equations …

Magnetic fields on small scales are ubiquitous in the Universe. Although they can often be
observed in detail, their generation mechanisms are not fully understood. One possibility is …

Coronal magnetic fields evolve quasi-statically over long timescales and dynamically over
short timescales. As of now there exist no regular measurements of coronal magnetic fields …

We show that the growth rate of dust grains in cold molecular clouds is enhanced by the
high degree of compressibility of a turbulent, dilute gas. By means of high-resolution (1024 …

Context. Space weather modelling has been gaining importance due to our increasing
dependency on technology sensitive to space weather effects, such as satellite services, air …

Surface convection is important for the presence of magnetic activity at stars. So far, this
convection is thought to be a result of heating from below, where convection cells rise and …

Context. Numerical models of the solar atmosphere are widely used in solar research and
provide insights into unsolved problems such as the heating of coronal loops. A prerequisite …

Coagulation driven by supersonic turbulence is primarily an astrophysical problem because
coagulation processes on Earth are normally associated with incompressible fluid flows at …