Non-ideal MHD Properties of Photospheric Flux Tubes
نویسندگان
چکیده
منابع مشابه
Photospheric processes and magnetic flux tubes
New high-resolution observations reveal that small-scale magnetic flux concentrations have a delicate substructure on a spatial scale of 0.1′′. Their basic structure can be interpreted in terms of a magnetic flux sheet or tube that vertically extends through the ambient weak-field or fieldfree atmosphere with which it is in mechanical equilibrium. A more refined interpretation comes from new th...
متن کاملNonlinear Mhd Simulations of Wave Dissipation in Flux Tubes
The phase-mixing and resonant dissipation of Alfv en waves is studied in both thèclosed' magnetic loops and thèopen' coronal holes observed in the hot solar corona. The resulting energy transfer from large to small length scales contributes to the heating of these magnetic structures. The nonlinear simulations show that the periodically varying shear ows that occur in the resonant layers are un...
متن کاملNon-Riemannian Geometry of Twisted Flux Tubes
New examples of the theory recently proposed by Ricca [PRA(1991)] on the generalization of Da RiosBetchov intrinsic equations on curvature and torsion of classical non-Riemannian vortex higher-dimensional string are given. In particular we consider applications to 3-dimesional fluid dynamics, including the case of a twisted flux tube and the fluid rotation. In this case use is made of Da Rios e...
متن کاملSuperconducting and Spinning Non-Abelian Flux Tubes
We find new non-Abelian flux tube solutions in a model of Nf scalar fields in the fundamental representation of SU(Nc) × U(1) (Nc ≤ Nf ) and study their main properties. Among the solutions there are spinning strings as well as superconducting ones. The solutions exist only on a non trivial domain of the parameter space defined by the ratio between the SU(Nc) and U(1) coupling constants, the ma...
متن کاملPhysical Properties of Parasitic Modes in Non-ideal Mhd Accretion Disks
We investigate the stability of incompressible, exact, non-ideal magnetorotational (MRI) modes against parasitic instabilities for a broad range of dissipation coefficients, relevant to astrophysical and laboratory environments. This allows us to uncover the asymptotic behavior of the fastest parasites in terms of the Elsasser number, Λη, when viscous effects are not important. We calculate the...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2001
ISSN: 0074-1809
DOI: 10.1017/s0074180900219888