Global magnetospheric dynamics in simulations and observations
Convener: Andrey Samsonov | Co-conveners: Yulia Bogdanova, C.-Philippe Escoubet, Minna Palmroth, David Sibeck
| Attendance Tue, 05 May, 14:00–15:45 (CEST)

The state of the magnetosphere is controlled mainly by solar wind conditions. The interplanetary magnetic field (IMF) as well as solar wind plasma parameters regulate the energy input into the magnetosphere. The direction of the IMF plays an important role in the coupling between the solar wind and magnetosphere. For example, during northward IMF conditions, the coupling is more complex, consisting of lobe reconnection as well as plasma transfer due to Kelvin-Helmholtz waves at the magnetospheric flanks. Quasi-radial IMF results in the formation of a foreshock upstream from the dayside magnetosphere, high-speed jets in the magnetosheath and magnetopause deformation. Magnetopause reconnection provides magnetic flux to the magnetotail, while substorms release magnetic energy stored within the magnetotail into the kinetic energy of accelerated particles. There are many different dynamic regimes or modes for the magnetosphere, including the quiet magnetosphere, steady magnetospheric convection, sawtooth oscillations, substorms, and storms. Transitions between these modes may result from changes in the upstream solar wind conditions, be the consequence of internal magnetospheric dynamics, and/or ionospheric feedback. As field-aligned currents couple the magnetosphere and ionosphere, the behaviours of the magnetosphere and ionosphere are closely related. Global magnetospheric dynamics can be studied by means of numerical simulations (MHD or kinetic), using empirical and semi-empirical models, or with the help of multipoint spacecraft observations. Besides, some past and future space missions can make global magnetospheric imaging providing information about positions and dynamics of the magnetospheric boundaries. One such example is the ESA/CSA Solar Wind Magnetosphere Ionosphere Link Explorer (SMILE) mission bringing into space the soft X-ray imager (SXI) and ultraviolet imager (UVI) as well as in situ instruments will be launched in 2023. We welcome any work presenting results on the global dynamics of the Earth’s magnetosphere as well as other planets’ magnetospheres.