EGU2020-6891
https://doi.org/10.5194/egusphere-egu2020-6891
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Modulation of the solar wind driven ion escape from unmagnetized planets by ultra-low-frequency foreshock waves in a global hybrid simulation

Riku Jarvinen1,2, Esa Kallio1, and Tuija Pulkkinen1,3
Riku Jarvinen et al.
  • 1Department of Electronics and Nanoengineering, School of Electrical Engineering, Aalto University, Espoo, Finland (riku.jarvinen@aalto.fi)
  • 2Finnish Meteorological Institute, Helsinki, Finland
  • 3Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, Michigan, USA

We study the solar wind interaction with Venus in a 3-dimensional global hybrid model where ions are treated as particles and electrons are a charge-neutralizing fluid. We concentrate on large-scale ultra-low frequency (ULF) waves in the ion foreshock and how they affect the energization and escape of planetary ions. The ion foreshock forms in the upstream region ahead of the quasi-parallel bow shock, where the angle between the shock normal and the magnetic field is smaller than about 45 degrees. The magnetic connection with the bow shock allows backstreaming of the solar wind ions leading to the formation of the ion foreshock. This kind of beam-plasma configuration is a source of free energy for the excitation of plasma waves. The foreshock ULF waves convect downstream with the solar wind flow and encounter the bow shock and transmit in the downstream region. We analyze the coupling of the ULF waves with the planetary ion acceleration and compare Venus and Mars in a global hybrid simulation.

How to cite: Jarvinen, R., Kallio, E., and Pulkkinen, T.: Modulation of the solar wind driven ion escape from unmagnetized planets by ultra-low-frequency foreshock waves in a global hybrid simulation, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-6891, https://doi.org/10.5194/egusphere-egu2020-6891, 2020