Sprecher/in: Emre Işık (Max Planck Institute for Solar System Research)

Titel: From Sun to Stars: Unraveling the Physics of Magnetic Activity

Zusammenfassung: Cool stars exhibit various signatures of magnetic activity over a range of activity levels and variability patterns. In this talk I will highlight some of the unsolved problems that hinder our understanding of stellar magnetic activity and its effects on exoplanets. Why do some other Sun-like stars have such different activity levels and patterns? How does stellar magnetic flux increase with rotation? I will begin the talk with a presentation of the large-scale spatio-temporal organisation of the solar photospheric magnetic field, in particular, the active-region magnetic fields and their hierarchical surface distributions. Then I will compare the Sun to other solar-type stars at various activity levels, from various observational and theoretical perspectives. Next, I will introduce our Flux Emergence And Transport (FEAT) models, with examples of forward modelling of activity diagnostics, and how deep-seated magnetic fields can be intensified in rapidly rotating young suns, leading to a possible explanation for the occurrence of low-latitude spots on fast rotators. In the end, I will present an outlook with our current attempts at revealing the underlying scaling laws for stellar rotation-activity relationships.

Anmerkung: Speaker Homepage: https://emre-isik.github.io | Host: Silva Järvinen

• Datum:
  9. Oktober 2025, 14:30 – 15:30
  
  
• Ort:

  AIP; Kirch-Haus, Konferenzraum

  
  
• Kontakt:
  Julián Alvarado-Gómez
  julian.alvarado-gomez@aip.de