65 citations · 627 across the 36 of their papers we have counts for
17 papers · 1 filter
Non-axisymmetric instability of axisymmetric magnetic fields
Alfio Bonanno, Vadim Urpin
The MHD instabilities can generate complex field topologies even if the initial field configuration is a very simple one. We consider the stability properties of magnetic configura…
Current-driven instabilities in weakly ionized disks
Edward Liverts, Michael Mond, Vadim Urpin
Cool weakly ionized gaseous rotating disk form the basis for many models in astrophysics objects. Instabilities against perturbations in such disks play an important role in the th…
Magnetic shear-driven instability and turbulent mixing in magnetized protostellar disks
Alfio Bonanno, Vadim Urpin
Observations of protostellar disks indicate the presence of the magnetic field of thermal (or superthermal) strength. In such a strong magnetic field, many MHD instabilities respon…
Stability of magnetic configurations containing the toroidal and axial fields
Alfio Bonanno, Vadim Urpin
Stability properties of magnetic-field configurations containing the toroidal and axial field are considered. The stability is treated by making use of linear analysis. It is shown…
Stretching of the toroidal field and generation of magnetosonic waves in differentially rotating plasma
Alfio Bonanno, Vadim Urpin
We evaluate the generation of magnetosonic waves in differentially rotating magnetized plasma. Differential rotation leads to an increase of the azimuthal field by winding up the p…
Hydromagnetic Instability in plane Couette Flow
Alfio Bonanno, Vadim Urpin
We study the stability of a compressible magnetic plane Couette flow and show that compressibility profoundly alters the stability properties if the magnetic field has a component…
Compressibility and local instabilities of differentially rotating magnetized gas
Alfio Bonanno, Vadim Urpin
We study the stability of compressible cylindrical differentially rotating flow in the presence of the magnetic field, and show that compressibility alters qualitatively the stabil…
The magnetic structure of neutron stars and their surface-to-core temperature relation
A. Y. Potekhin, V. Urpin, G. Chabrier
We study the relation between the mean effective surface temperature T_s and the internal temperature T_b for magnetic neutron stars, assuming that the magnetic field near the surf…
Protoneutron star dynamos and pulsar magnetism
A. Bonanno, V. Urpin, G. Belvedere
We have investigated the turbulent mean-field dynamo action in protoneutron stars that are subject to convective and neutron finger instabilities during the early evolutionary phas…
Anisotropic convection in rotating proto-neutron stars
J. A. Miralles, J. A. Pons, V. Urpin
We study the conditions for convective instability in rotating, non-magnetic proto--neutron stars. The criteria that determine stability of nascent neutron stars are analogous to t…
Mean-field dynamo action in protoneutron stars
Alfio Bonanno, Luciano Rezzolla, Vadim Urpin
We have investigated the turbulent mean-field dynamo action in protoneutron stars that are subject to convective and neutron finger instabilities. While the first one develops most…
The stability of protostellar disks with Hall effect and buoyancy
V. Urpin, G. Rüdiger
The stability properties of inviscid protostellar disks are examined taking into account the Hall effect and buoyancy. Depending on the parameters, different types of instabilities…
Hydromagnetic instabilities in protoneutron stars
Juan A. Miralles, Jose A. Pons, V. Urpin
The stability properties of newly born neutron stars, or proto--neutron stars, are considered. We take into account dissipative processes, such as neutrino transport and viscosity,…
Convective instability in proto-neutron stars
Juan A. Miralles, Jose A. Pons, V. Urpin
The linear hydrodynamic stability of proto-neutron stars (PNSs) is considered taking into account dissipative processes such as neutrino transport and viscosity. We obtain the gene…
Joule heating and the thermal evolution of old neutron stars
Juan A. Miralles, Vadim Urpin, Denis Konenkov
We consider Joule heating caused by dissipation of the magnetic field in the neutron star crust. This mechanism may be efficient in maintaining a relatively high surface temperatur…
Magnetic and spin evolution of neutron stars in close binaries
V. Urpin, U. Geppert, D. Konenkov
The evolution of neutron stars in close binary systems with a low-mass companion is considered assuming the magnetic field to be confined within the solid crust. We adopt the stand…
Magnetic and spin evolution of isolated neutron stars with the crustal magnetic field
Vadim Urpin, Denis Konenkov
We consider the magnetic and spin evolution of isolated neutron stars assuming that the magnetic field is initially confined to the crust. The evolution of the crustal field is det…