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Solar Physics

, 294:51 | Cite as

Nonlinear Evolution of Ion Kinetic Instabilities in the Solar Wind

  • Leon OfmanEmail author
Article
Part of the following topical collections:
  1. Solar Wind at the Dawn of the Parker Solar Probe and Solar Orbiter Era

Abstract

In-situ observations of the solar wind (SW) plasma from 0.29 to 1 AU show that the protons and \(\alpha \) particles are often non-Maxwellian, with evidence of kinetic instabilities, temperature anisotropies, differential ion streaming, and associated magnetic fluctuations spectra. The kinetic instabilities in the SW multi-ion plasma can lead to preferential heating of \(\alpha \) particles and the dissipation of magnetic fluctuation energy, affecting the kinetic and global properties of the SW. Using for the first time a three-dimensional hybrid model, where ions are modeled as particles using the Particle-In-Cell (PIC) method and electrons are treated as fluid, we study the onset, nonlinear evolution and dissipation of ion kinetic instabilities. The Alfvén/ion cyclotron, and the ion drift instabilities are modeled in the region close to the Sun (\(\sim 10R_{s}\)). Solar wind expansion is incorporated in the model. The model produces self-consistent non-Maxwellian velocity distribution functions (VDFs) of unstable ion populations, the associated temperature anisotropies, and wave spectra for several typical SW instability cases in the nonlinear growth and saturation stage of the instabilities. The 3D hybrid modeling of the multi-ion SW plasma could be used to study the SW acceleration region close to the Sun, which will be explored by the Parker Solar Probe mission.

Keywords

Solar wind, theory: numerical modeling Instabilities Waves, plasma 

Notes

Acknowledgements

The author acknowledges support by NASA cooperative agreement NNG11PL10A 670.154 to the Catholic University of America. Resources supporting this work were provided by the NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center.

Disclosure of Potential Conflicts of Interest

The author declares he has no conflicts of interest.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Department of PhysicsCatholic University of AmericaWashingtonUSA
  2. 2.NASA Goddard Space Flight CenterGreenbeltUSA

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