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Superfast ion scattering by solar wind discontinuities.
A V Artemyev1,2, A I Neishtadt2,3, A A Vasiliev2
1Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California, USA.
Physical Review. E
|October 20, 2020
Summary
Solar wind discontinuities rapidly scatter energetic ions through pitch-angle scattering. This process, driven by kinetic-scale structures, efficiently disperses ions regardless of discontinuity type.
Area of Science:
- Plasma Physics
- Astrophysics
- Space Physics
Background:
- Large-amplitude fluctuations in the solar wind magnetic field scatter energetic ions.
- Solar wind discontinuities, characterized by rapid magnetic field rotations, are a primary source of these fluctuations.
Purpose of the Study:
- To investigate the role of internal discontinuity configuration in energetic ion pitch-angle scattering.
- To determine the scattering efficiency of different types of solar wind discontinuities.
Main Methods:
- Analysis of kinetic-scale discontinuities and their internal structure.
- Examination of energetic ion scattering mechanisms, specifically adiabatic invariant destruction via separatrix crossings.
Main Results:
- Kinetic-scale discontinuities cause very fast ion pitch-angle scattering.
- Scattering efficiency is independent of the magnetic field component across the discontinuity surface.
- Both rotational and tangential discontinuities exhibit similar scattering efficiencies.
Conclusions:
- The internal configuration of solar wind discontinuities is crucial for energetic ion scattering.
- Adiabatic invariant destruction at separatrix crossings is the dominant scattering mechanism.
- Deviations from force-free conditions in discontinuities influence scattering effects.
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