The Yin-Yang Magnetic Flux Eruption (Yin-Yang-MFE) Code: A Global Corona Magnetohydrodynamic Code with the Yin-Yang grid

TL;DR

This paper introduces the Yin-Yang-MFE code, a global MHD simulation tool utilizing the Yin-Yang grid to model the solar corona and wind, incorporating non-adiabatic effects and validated through standard tests and solar wind simulations.

Contribution

It presents a novel global MHD code with the Yin-Yang grid, including advanced physical effects and parallelization, for modeling solar corona and wind dynamics.

Findings

Successfully models solar wind with dipolar magnetic field

Validates code performance with standard tests

Demonstrates capability for large-scale solar phenomena

Abstract

We describe the numerical algorithms of a global magnetohydrodynamic (MHD) code utilizing the Yin-Yang grid, called the Yin-Yang Magnetic Flux Eruption (Yin-Yang-MFE) code, suitable for modeling the large-scale dynamical processes of the solar corona and the solar wind. It is a single-fluid MHD code taking into account the non-adiabatic effects of the solar corona, including the electron heat conduction, optically thin radiative cooling, and empirical coronal heating. We describe the numerical algorithms used to solve the set of MHD equations (with the semi-relativistic correction, or the Boris correction) in each of the partial spherical shell Yin Yang domains, and the method for updating the boundary conditions in the ghost-zones of the two overlapping domains with the code parallelized with the message passing interface (MPI). We validate the code performance with a set of standard test problems, and finally present a solar wind solution with a dipolar magnetic flux distribution at the solar surface, representative of solar minimum configuration.