Jingting Liu - A Model for the Langmuir Wave Excitation in Magnetic Holes

Jingting Liu (Mullard Space Science Laboratory, University College London) - A Model for the Langmuir Wave Excitation in Magnetic Holes
Abstract:
Magnetic holes are structures observed both in the solar wind and in space plasmas across the solar system. These structures are characterised by a sharp and sudden decrease in magnetic field strength over a short period, with increase in plasma density. Various types of waves have been observed around magnetic holes.
Langmuir waves, frequently detected in the solar wind, play a role in the energetics of plasma electrons. Previous observational studies have linked the presence of Langmuir waves to magnetic holes, suggesting a strong correlation between these phenomena in the solar wind.
In this study, we develop a model to explain how Langmuir waves are excited in magnetic holes. Our model demonstrates how changes in the electron distribution trigger the Langmuir instability. We use data from Solar Orbiter to provide a comprehensive view of this process and to test our predictions. By understanding these mechanisms, we aim to unlock the mysteries of magnetic holes and enhance our understanding of wave-particle interactions in complex magnetic fields.
Image Credit: Jingting Liu