The operationally ready full three-dimensional magnetohydrodynamic (3D MHD) model from the Sun to Earth: COCONUT+Icarus
arxiv(2024)
摘要
Solar wind modelling has become a crucial area of study due to the increased
dependence of modern society on technology, navigation, and power systems.
Accurate space weather forecasts can predict upcoming threats to Earth's
geospace. In this study, we examine a novel full magnetohydrodynamic (MHD)
chain from the Sun to Earth. The goal of this study is to demonstrate the
capabilities of the full MHD modelling chain from the Sun to Earth by
finalising the implementation of the full MHD coronal model into the COolfluid
COroNa UnsTructured (COCONUT) model and coupling it to the MHD heliospheric
model Icarus. The resulting coronal model has significant advantages compared
to the pre-existing polytropic alternative, as it models a more realistic
bi-modal wind, which is crucial for heliospheric studies.
In this study, only thermal conduction, radiative losses, and approximated
coronal heating function were considered in the energy equation. A realistic
specific heat ratio was applied. The output of the coronal model was used to
onset the 3D MHD heliospheric model Icarus. A minimum solar activity case was
chosen as the first test case for the full MHD model. The numerically simulated
data in the corona and the heliosphere were compared to observational products.
We present a first attempt to obtain the full MHD chain from the Sun to Earth
with COCONUT and Icarus. The coronal model has been upgraded to a full MHD
model for a realistic bi-modal solar wind configuration. The approximated
heating functions have modelled the wind reasonably well, but simple
approximations are not enough to obtain a realistic density-speed balance or
realistic features in the low corona and farther, near the outer boundary. The
full MHD model was computed in 1.06 h on 180 cores of the Genius cluster of the
Vlaams Supercomputing Center, which is only 1.8 times longer than the
polytropic simulation.
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