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SUMMARY:On the stability of large magnetic solar structures
DTSTART;VALUE=DATE-TIME:20230509T145500Z
DTEND;VALUE=DATE-TIME:20230509T151000Z
DTSTAMP;VALUE=DATE-TIME:20240704T115653Z
UID:indico-contribution-321@meetings.aip.de
DESCRIPTION:Speakers: Jan Jurcak (Astronomical Institute of the CAS)\nWe w
 ill review the recent observational results that show the key role played 
 by the vertical component of the magnetic field (B$_\\mathrm{ver}$) in the
  inhibition of convection in the solar photosphere. In sunspots\, only reg
 ions with B$_\\mathrm{ver}$ stronger than a critical value of approximatel
 y 1.8 kG (the critical value is dependent on the data used\, definition of
  the umbral boundary\, inversion scheme\, etc.) are stable against convect
 ion and the intensity boundaries of stable umbrae can be equally outlined 
 by this critical B$_\\mathrm{ver}$. In regions with B$_\\mathrm{ver}$ weak
 er than the critical value\, more vigorous modes of magneto-convection tak
 e over. This behavior is observed during the formation of penumbra and lig
 ht bridges and during the decay of sunspots and pores. We will compare the
 se observations to analyses of sunspots simulations and to theoretical mod
 els describing the stability of overturning convection in the presence of 
 magnetic fields and we will discuss the repercussion in the life cycle of 
 magnetic structures.\n\nhttps://meetings.aip.de/event/24/contributions/321
 /
LOCATION:Haus H\, Telegrafenberg
URL:https://meetings.aip.de/event/24/contributions/321/
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