Student: Andrii Lynnyk
Školitel: RNDr. Marek Vandas, DrSc. (AsÚ AV ČR)
Konzultant: Prof. RNDr. Zdeněk Němeček, DrSc., Prof. RNDr. Jana Šafránková, DrSc.
Stav práce: obhájená
Abstrakt:
Coronal mass ejections (CMEs) are huge expulsions of mass from the solar corona into the interplanetary space. They propagate in the solar wind, often with a significantly higher velocity and therefore they drive a bow shock ahead. Passing over the Earth, they may cause severe geomagnetic storms. Despite continuing effort, their detailed structure, three dimensional shape, and dynamic interactions with the ambient solar wind are not well understood. However, such knowledge would be important for predictions of CMEs impacts on the Earth. A CMEs bow shock, its higher density, and strong magnetic field interact with the Earth’s bow shock/magnetopause/magnetosphere system. These interactions will also be a subject of this study.
We suppose the following topics:
1) Dynamics of CMEs in the solar wind will be studied with analytical and numerical tools. Various shapes of CMEs will be considered, forces acting on them identified and discussed in detail. Theoretical/simulation results will be compared with observations.
2) Magnetic structure and shapes of magnetic clouds, a special subset of CMEs, will be studied in detail and existing/suggested models compared with observations.
3) Interaction of CMEs with the Earth’s magnetosphere system will be investigated.
For this, we asssume to use 3-D MHD simulations and the experimental data with multispacecraft observations. The study is supported by the joint (MFF – AsÚ) grant project and there is a possibility to visit the cooperating institutions aboard.