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SUMMARY:Giant magnetic fields of small stars. New insights into M-dwarf ma
 gnetism - Oleg Kochukhov (Uppsala University)
DTSTART:20230223T160000Z
DTEND:20230223T170000Z
UID:TALK195262@talks.cam.ac.uk
CONTACT:Nicolas Laporte
DESCRIPTION:Magnetic fields play a fundamental role for the interior and a
 tmospheric properies of M dwarfs and greatly influence terrestrial planets
  orbiting in the habitable zones of these low-mass stars. Determination of
  the strength and topology of magnetic fields\, both on stellar surfaces a
 nd throughout the extended stellar magnetospheres\, is a key ingredient fo
 r advancing stellar and planetary sciences. In this talk I will review mod
 ern methods of magnetic field measurements applied to M dwarfs\, with an e
 mphasis on direct diagnostics based on interpretation of the Zeeman effect
  signatures in high-resolution intensity and polarisation spectra. I will 
 summarise results of field strength measurements using Zeeman broadening a
 nalyses as well as information on global magnetic geometries inferred from
  spectropolarimetric observations. The emerging understanding of complex\,
  multi-scale nature of M-dwarf magnetic fields will be discussed in the co
 ntext of theoretical models of hydromagnetic dynamos and stellar interior 
 structure altered by magnetic fields.\n
LOCATION:Hoyle Lecture Theatre 
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