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Thesis
Home   /   Thesis   /   Study of the dynamics of the solar corona and wind at the maximum of magnetic cycle 25

Study of the dynamics of the solar corona and wind at the maximum of magnetic cycle 25

Astrophysics Corpuscular physics and outer space

Abstract

The Sun's activity is modulated according to an average 11-year magnetic cycle, with the next maximum expected in 2025. This increase in activity implies greater temporal variability for our star, both in terms of its magnetic field, with intense structures appearing and disappearing at a higher rate, and in terms of its atmosphere, which will produce a wind of charged particles that varies in speed and density. These variations have major consequences for the Earth, as it becomes more difficult to predict their impact on our technological society, such as radio blackouts or electrical surges. One of the greatest challenges facing space weather forecasting today is to provide reliable forecasts for the most variable events, which are often also the most extreme.
This thesis proposes to take advantage of the unprecedented conjunction of observations available for the next solar maximum with the Parker Solar Probe and Solar Orbiter space probes, in order to significantly improve the available solar wind models. The student will be able to calibrate the Wind Predict-AW 3D MHD model, one of the most advanced in Europe, to characterize its ability to reproduce conditions of maximum activity. This characterization will involve automated comparisons with different solar datasets, on highly parallel simulations (HPC) producing Big Data-scale results. He will also participate in the development of a new model capable of evolving magnetograms over time, based on the magneto-frictional approach and the evolution of the photospheric electric field - the most advanced techniques for the temporal evolution of magnetic structures - and will use them to quantify the information missing at maximum solar activity, and thus improve space weather forecasts.

Laboratory

Institut de recherche sur les lois fondamentales de l’univers
Direction d’Astrophysique
Laboratoire de dynamique des étoiles des (Exo) planètes et de leur environnement
Paris-Saclay
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