BEGIN:VCALENDAR
VERSION:2.0
PRODID:https://murmitoyen.com/events/vanille/udem/
X-WR-TIMEZONE:America/Montreal
BEGIN:VEVENT
UID:69dffa530225c
DTSTAMP:20260415T165131
DTSTART:20140417T113000
SEQUENCE:0
TRANSP:OPAQUE
DTEND:20140417T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/401306
LOCATION:Université de Montréal - Pavillon Roger-Gaudry\, 2900\, chemin d
 e la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:Huge Dynamo action in spiral galaxies
DESCRIPTION:Conférence de Luke Chamandy\, Inter-University Center for Astr
 onomy and AstrophysicsRésuméLarge-scale magnetic fields in disk galaxies
 \, visible in polarized synchrotron emission and its Faraday rotation\, re
 quire a generation mechanism that orders magnetic fields on scales larger 
 than the turbulent scale\; what is referred to as a mean-field dynamo. In 
 many cases\, these fields exhibit deviations from axial symmetry\, in part
 icular where the large-scale field is enhanced in ‘spiral magnetic arms
 ’ akin to\, but sometimes phase-shifted from\, the optical spiral arms.W
 e present mean-field galactic dynamo models which include non-linear effec
 ts arising from magnetic helicity balance (the dynamical alpha-quenching)\
 , the delayed response of the mean electromotive force to variations of th
 e mean magnetic field and turbulence parameters (the temporal non-locality
 )\, galactic outflows\, and realistic spiral structure and evolution. In p
 articular\, we isolate three important physical effects which apparently c
 ontribute to the formation of magnetic arms.Présentée par le Groupe Astr
 onomie et astrophysique du Département de physique de l'Université de M
 ontréal. Cette conférence est destinée à des spécialistes dans le dom
 aine de l'astrophysique et sera donnée en anglais.
END:VEVENT
BEGIN:VTIMEZONE
TZID:America/Montreal
X-LIC-LOCATION:America/Montreal
END:VTIMEZONE
END:VCALENDAR