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BEGIN:VEVENT
DTSTAMP:20260816T184424Z
DTSTART;VALUE=DATE-TIME:20260907T140000
DTEND;VALUE=DATE-TIME:20260907T150000
SUMMARY:Maximilien Péters de Bonhomme (KU Leuven): "Formation of Suprathe
 rmal Electron Populations in the Expanding\, Turbulent Solar Wind"
TZID:Europe/London
UID:20260907-8ac672c79feec81c019ff01e2c2b0a6c@warwick.ac.uk
CREATED:20260811T091857Z
DESCRIPTION:Nonthermal features are ubiquitously observed in electron vel
 ocity distribution functions in the solar wind\, yet their origin in the
  collisionless\, turbulent\, expanding solar-wind plasma remains unclear
 . We investigate how kinetic plasma instabilities and Alfvénic turbulenc
 e jointly generate and regulate these features using the first fully kin
 etic particle-in-cell simulation of an expanding turbulent plasma under 
 heliospheric conditions. In our setup\, expansion-driven weakening of th
 e magnetic field adiabatically cools the plasma perpendicularly to the m
 ean field while leaving the parallel temperature largely unchanged\, dri
 ving the system toward the firehose-instability threshold. Concurrently\
 , strongly anisotropic turbulence leads to perpendicular heating and the
  development of nonthermal features. Subsequently\, we find that suprath
 ermal electron populations preferentially develop in the parallel direct
 ion\, forming pronounced power-law tails even under weakly compressive\,
  highly Alfvénic conditions\, and persist despite anisotropy regulation 
 by the firehose instability. The preferential parallel energization poin
 ts to field-particle interactions involving parallel electric fields or 
 resonant wave–particle interactions\, rather than simple velocity-space 
 redistribution. These results provide the first direct evidence of the e
 mergence of nonthermal-electron features in a unified kinetic framework 
 linking expansion\, turbulence\, and instabilities in the solar wind.
LOCATION:F25A
URL:
ATTACH:
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20260811T091857Z
ORGANIZER;CN=Dmitrii Kolotkov:
END:VEVENT
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