Global MHD phenomena and their importance for stellar surfaces
2010 ◽
Vol 6
(S273)
◽
pp. 141-147
Keyword(s):
AbstractThis review is an attempt to elucidate MHD phenomena relevant for stellar magnetic fields. The full MHD treatment of a star is a problem which is numerically too demanding. Mean-field dynamo models use an approximation of the dynamo action from the small-scale motions and deliver global magnetic modes which can be cyclic, stationary, axisymmetric, and non-axisymmetric. Due to the lack of a momentum equation, MHD instabilities are not visible in this picture. However, magnetic instabilities must set in as a result of growing magnetic fields and/or buoyancy. Instabilities deliver new timescales, saturation limits and topologies to the system probably providing a key to the complex activity features observed on stars.
1975 ◽
Vol 67
(3)
◽
pp. 417-443
◽
Keyword(s):
2020 ◽
Vol 495
(4)
◽
pp. 4557-4569
◽
Keyword(s):
2002 ◽
Vol 456
◽
pp. 219-237
◽
Keyword(s):
2008 ◽
Vol 4
(S259)
◽
pp. 479-484
◽
Keyword(s):
2020 ◽
Vol 499
(2)
◽
pp. 2076-2086
Keyword(s):
2012 ◽
Vol 8
(S294)
◽
pp. 313-318
Keyword(s):
2010 ◽
Vol 6
(S272)
◽
pp. 160-165