ar X iv : a st ro - p h / 03 12 21 2 v 1 8 D ec 2 00 3 The Sun ’ s Preferred Longitudes and the Coupling of Magnetic Dynamo Modes
نویسنده
چکیده
Observations show that solar activity is distributed non-axisymmetrically, concentrating at “preferred longitudes”. This indicates the important role of non-axisymmetric magnetic fields in the origin of solar activity. We investigate the generation of the non-axisymmetric fields and their coupling with axisymmetric solar magnetic field. Our kinematic generation (dynamo) model operating in a sphere includes solar differential rotation, which approximates the differential rotation obtained by inversion of helioseismic data, modelled distributions of the turbulent resistivity, non-axisymmetric mean helicity, and meridional circulation in the convection zone. We find that (1) the non-axisymmetric modes are localised near the base of the convection zone, where the formation of active regions starts, and at latitudes around 30; (2) the coupling of non-axisymmetric and axisymmetric modes causes the non-axisymmetric mode to follow the solar cycle; the phase relations between the modes are found. (3) The rate of rotation of the first non-axisymmetric mode is close to that determined in the interplanetary space. Subject headings: Sun: magnetic fields — MHD
منابع مشابه
ar X iv : a st ro - p h / 06 12 37 8 v 1 1 4 D ec 2 00 6 Magnetic fields , strings and cosmology
متن کامل
ar X iv : a st ro - p h / 07 03 71 1 v 1 2 8 M ar 2 00 7 Solar Interior – Radial Structure , Rotation , Solar Activity Cycle
Some basic properties of the solar convection zone are considered and the use of helioseismology as an observational tool to determine its depth and internal angular velocity is discussed. Aspects of solar magnetism are described and explained in the framework of dynamo theory. The main focus is on mean field theories for the Sun's magnetic field and its differential rotation.
متن کاملar X iv : a st ro - p h / 05 12 61 7 v 1 2 7 D ec 2 00 5 3 D Spectroscopy of Herbig - Haro objects
متن کامل
ar X iv : a st ro - p h / 02 12 57 9 v 1 3 1 D ec 2 00 2 Behaviour of Magnetic Tubes in Neutron Star ’ s
It is found from Maxwell's equations that the magnetic field lines are good analogues of relativistic strings. It is shown that the super-conducting current in the neutron star's interior causes local rotation of magnetic flux tubes carrying quantized flux.
متن کاملar X iv : a st ro - p h / 03 07 21 1 v 2 2 8 Ju l 2 00 3 Charged Domain Walls
In this paper we investigate Charged Domain Walls (CDW's), topological defects that acquire surface charge density Q induced by fermion states localized on the walls. The presence of an electric and magnetic field on the walls is also discussed. We find a relation in which the value of the surface charge density Q is connected with the existence of such topological defects.
متن کامل