EGU2020-10074, updated on 12 Jun 2020
https://doi.org/10.5194/egusphere-egu2020-10074
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Particle energisation and energy transport in Multiscale MHD - Hybrid - Kinetic PIC models of magnetospheres

Giovanni Lapenta1, Jean Berchem2, Raymond Walker2, Mostafa El Alaoui2, David Schriver2, Robert Richard2, and Pavel Travnicek3
Giovanni Lapenta et al.
  • 1KU Leuven, Center for Mathematical Plasma Astrophysics, Wiskunde, Leuven, Belgium (giovanni.lapenta@kuleuven.be)
  • 2UCLA
  • 3Astronomical Institute, CAS, Bocni II/1401, CZ-14100 Prague, Czech Republic

A grand challenge in physics is to understand how and where electrons and ions accelerate to high energy, often forming power law distributions. We report the result of a combined kinetic-fluid effort [1]. For Earth, a full kinetic model of sizeable chunks of the magnetosphere (e.g. the magnetopause up to the bow shock, or the magnetotail) of order 10-20 RE in size in each dimension is hosted within a MHD simulation that provides it with initial and boundary conditions. For Mercury, it is possible to treat the whole magnetosphere that in this case is spawn from a state derived from a hybrid code [2].
With this approach, we search for regions of most intense particle heating and acceleration, comparing the full kinetic (i.e. we treat both electrons and ions as particles) evolution with the evolution of the host global simulation: MHD for the Earth and hybrid for Mercury.

The results highlight some significant effects peculiar to kinetic models. First, of all full kinetic models provide a detailed view of the electron role in energy transfer, with a distinct role for the enthalpy, bulk and heat flux. Second, the full kinetic approach, allows for the development of modes and instabilities absent in global fluid or hybrid models [3].

How to cite: Lapenta, G., Berchem, J., Walker, R., El Alaoui, M., Schriver, D., Richard, R., and Travnicek, P.: Particle energisation and energy transport in Multiscale MHD - Hybrid - Kinetic PIC models of magnetospheres, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-10074, https://doi.org/10.5194/egusphere-egu2020-10074, 2020

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