A kinetic formation model of foreshock transients
- 1Cooperative Programs for the Advancement of Earth System Science, University Corporation for Atmospheric Research, Boulder, CO, USA
- 2Geophysical Institute, University of Alaska, Fairbanks, Fairbanks, AK, USA
- 3Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, CA, USA
- 4Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA
Foreshock transients are ion kinetic structures in the ion foreshock. Due to their dynamic pressure perturbations, they can disturb the bow shock, magnetosheath, magnetopause, and magnetosphere-ionosphere system. Recent studies found that they can also accelerate particles through shock drift acceleration, Fermi acceleration, betatron acceleration, and magnetic reconnection. Although foreshock transients are important, how they form is still not fully understood. Using particle-in-cell simulations and MMS observations, we propose a physical formation process that the positive feedback of demagnetized foreshock ions on the varying magnetic field caused by the foreshock ion Hall current enables an “instability” and the growth of the structure.
How to cite: Liu, T. Z., An, X., Zhang, H., and Turner, D.: A kinetic formation model of foreshock transients, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-8571, https://doi.org/10.5194/egusphere-egu21-8571, 2021.
