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SUMMARY:Invited speaker: Wave turbulence in solar and stellar winds - Vict
 or Réville (CNRS IRAP L'Institut de Recherche en Astrophysique et Planét
 ologie)
DTSTART:20221129T154500Z
DTEND:20221129T163000Z
UID:TALK192098@talks.cam.ac.uk
DESCRIPTION:Mechanisms for the coronal heating and the acceleration of the
  solar wind are still largely debated. The thorough study of the solar win
 d for the past 60 years has\, however\, motivated an important focus on Al
 fv&eacute\;n waves and turbulence. In this talk\, I will review and discus
 s models for Alfv&eacute\;n wave propagation and turbulent cascade\, which
  eventually leads to dissipation. I will show how turbulent transport mode
 ls can explain the large scale properties of the solar wind measured by th
 e Parker Solar Probe and Solar Orbiter. In the light of a recent study\, w
 e will see why a compressible process -the parametric decay instability- i
 s essential to the generation of a turbulent power spectrum from a narrow 
 band emission of Alfv&eacute\;n waves at the solar surface. Finally\, I wi
 ll discuss the relation between wave and turbulence and the composition of
  solar and stellar atmosphere through the first ionization potential&nbsp\
 ; (FIP) and inverse FIP effect.
LOCATION:Seminar Room 1\, Newton Institute
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