Anregung und Entwicklung von Fluktuationen im Nichtgleichgewichts-Sonnenwindplasma

• Antragsteller: Professor Dr. Reinhard Schlickeiser
• Fachliche Zuordnung: Astrophysik und Astronomie
• Förderung: Förderung von 2016 bis 2021
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 315239725

• Erstellungsjahr: 2021

Zusammenfassung der Projektergebnisse

Natural plasmas from heliosphere, e.g., the expanding solar wind and planetary magnetospheres, are plasmas out of thermal equilibrium. This is unequivocally proved by the in-situ observations, which reveal not only non-Maxwellian velocity distributions of plasma particles, e.g., kinetic anisotropies and suprathermal, Kappa-distributed populations, but also a multi-scale spectra of wave turbulence and fluctuations. The project has proved a strong inter-connection between these two components, by advanced investigations of the kinetic (low-scale) instability mechanisms. On the one hand, anisotropic distributions are important sources of wave instabilities and low-scale fluctuations. It was shown that temperature anisotropy instabilities are markedly enhanced by the suprathermal populations. On the other hand, the low-scale plasma waves can interact resonantly with electrons and protons in the solar wind, triggering their departures from thermal equilibrium and explaining an enhanced presence of suprathermal halo populations with increasing the heliocentric distance.

Projektbezogene Publikationen (Auswahl)

• Electromagnetic cyclotron instabilities in bi-Kappa distributed plasmas: A quasilinear approach, Phys. Plasmas 24 (2017) 042110
  Lazar, M., Yoon, P.H. and Eliasson, B.
  
• Electromagnetic electron cyclotron instability in the solar wind, J. Geophys. Res. 123 (2018) 6
  Lazar, M., Yoon, P.H., López, R.A., and Moya, P.S.
  
• Modified κ-distribution of solar wind electrons and steady-state Langmuir turbulence, Astrophys. J. 868 (2018), 131
  Yoon, P.H., Lazar, M., Scherer, K., Fichtner, H., Schlickeiser, R.
  
• Temperature anisotropy instabilities stimulated by the interplay of the core and halo electrons in space plasmas, Phys. Plasmas 25 (2018) 022902
  Lazar, M., Shaaban, S.M., Fichtner, H., and Poedts, S.
  
• Firehose instabilities triggered by the solar wind suprathermal electrons, MNRAS 483 (2019) 5642
  Shaaban, S.M., Lazar, M., López, R.A., Fichtner, H., Poedts, S.
  
• Particle-in-cell simulations of firehose instability driven by bi-Kappa electrons, Astrophys. J. Lett. 873 (2019) L20
  López, R.A., Lazar, M., Shaaban, S.M., et al.
  
• The interplay of the solar wind core and suprathermal electrons: A quasilinear approach for firehose instability, Astrophys. J. 871 (2019) 237
  Shaaban, S.M., Lazar, M., Yoon, P.H., Poedts, S.
  
• Whistler instability stimulated by the suprathermal electrons present in space plasmas, Astrophys. Space Sci. 364 (2019) id. 171
  Lazar, M., López, R.A., Shaaban, S.M., Poedts, S., Fichtner, H.
  
• Electromagnetic ion cyclotron instability stimulated by the suprathermal ions in space plasmas: A quasi-linear approach, Phys. Plasmas 28 (2021) id.022103
  Shaaban, S.M., Lazar, M., Schlickeiser, R.