BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//ZContent.net//ZapCalLib 1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20220127T103000
DTEND;TZID=Atlantic/Canary:20220127T113000
UID:iactalks-1537
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1537
CREATED:2022-01-27T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Dynamos, the drivers of solar and stellar activity
DESCRIPTION:Dynamos, the drivers of solar and stellar activity\nProf. Axel 
 Brandenburg\n\nFollowing Cowling's anti-dynamo theorem of 1933, there was 
 a long period during which the very existence of dynamos was unclear. Even
  with the emergence of three dimensional simulations in the late 1980s, pe
 ople were careful to distinguish true dynamos from just some sort of ampli
 fication. Meanwhile, we know of many examples of true dynamos - not only f
 rom simulations, but also from several laboratory experiments. Nevertheles
 s, there are still problems, fundamental ones and also very practical ones
 . After all, we are really not sure how the solar dynamo works. Today, glo
 bal three-dimensional simulations seem to have an easier time to reproduce
  the behaviors of superactive stars, but not really the group of inactive 
 stars, to which also the Sun belongs. The Sun itself may actually be speci
 al; it has so well defined cycles and it is at the brink of becoming very 
 different. Theoretically, slightly slower rotators should have antisolar r
 otation, but it is possible that some of those stars never become that slo
 w if stellar breaking ceases for some reason. Sun and starspots are very e
 vident indicators of solar and stellar activity. Their formation is also n
 ot well understood. Polarimetry reveals their magnetic helicity, which can
  be detected even with the solar wind.
END:VEVENT
END:VCALENDAR