Soler, R., Oliver, R., Ballester, J. L.
Prominences are partially ionized, magnetized plasmas embedded in the solar corona. Damped oscillations and propagating waves are commonly observed. These oscillations have been interpreted in terms...
Resonantly Damped Kink Magnetohydrodynamic Waves in a Partially Ionized Filament Thread (2009)
Soler, R., Oliver, R., Ballester, J. L.
Transverse oscillations of solar filament and prominence threads have been frequently reported. These oscillations have the common features of being of short period (2-10 min) and being damped after...
Swaying threads of a solar filament (2009)
Lin, Y., Soler, R., Engvold, O., Ballester, J. L., Langangen, \O., Oliver, R., ...
From recent high resolution observations obtained with the Swedish 1 m Solar Telescope in La Palma, we detect swaying motions of individual filament threads in the plane of the sky. The oscillatory...
On the nature of kink MHD waves in magnetic flux tubes (2009)
Goossens, M., Terradas, J., Andries, J., Arregui, I., Ballester, J. L.
Magnetohydrodynamic (MHD) waves are often reported in the solar atmosphere and usually classified as slow, fast, or Alfv\'en. The possibility that these waves have mixed properties is often ignored....
Magnetohydrodynamic Waves in a Partially Ionized Filament Thread (2009)
Soler, R., Oliver, R., Ballester, J. L.
Oscillations and propagating waves are commonly seen in high-resolution observations of filament threads, i.e., the fine-structures of solar filaments/prominences. Since the temperature of...
Damping of filament thread oscillations: effect of the slow continuum (2009)
Soler, R., Oliver, R., Ballester, J. L., Goossens, M.
Transverse oscillations of small amplitude are commonly seen in high-resolution observations of filament threads, i.e. the fine-structures of solar filaments/prominences, and are typically damped in...
A. Orfila, J. L. Ballester, R. Oliver, A. Alvarez, J. Tintoré
Abstract. In the past, it has been postulated that the irregular dynamics of the solar cycle may embed a low order chaotic process (Weiss 1988, 1994; Spiegel 1994) which, if true, implies that the...
Global shallow water magnetohydrodynamic waves in the solar tachocline (2008)
Zaqarashvili, T. V., Oliver, R., Ballester, J. L.
We derive analytical solutions and dispersion relations of global magnetic Poincar\'e (magneto-gravity) and magnetic Rossby waves in the approximation of shallow water magnetohydrodynamics. The...
Propagation of nonadiabatic magnetoacoustic waves in a threaded prominence with mass flows (2008)
Soler, R., Oliver, R., Ballester, J. L.
High resolution observations of solar filaments suggest the presence of groups of prominence threads, i.e. the fine-structures of prominences, which oscillate coherently (in phase). In addition, mass...
Transverse oscillations of systems of coronal loops (2008)
Luna, M., Terradas, J., Oliver, R., Ballester, J. L.
We study the collective kinklike normal modes of a system of several cylindrical loops using the T-matrix theory. Loops that have similar kink frequencies oscillate collectively with a frequency...
Nonlinear Instability of kink oscillations due to shear motions (2008)
Terradas, J., Andries, J., Goossens, M., Arregui, I., Oliver, R., Ballester, J. L.
First results from a high-resolution three-dimensional nonlinear numerical study of the kink oscillation are presented. We show in detail the development of a shear instability in an untwisted...
Analytic approximate seismology of transversely oscillating coronal loops (2008)
Goossens, M., Arregui, I., Ballester, J. L., Wang, T. J.
We present an analytic approximate seismic inversion scheme for damped transverse coronal loop oscillations based on the thin tube and thin boundary approximation for computing the period and the...
Non-adiabatic magnetohydrodynamic waves in a cylindrical prominence thread with mass flow (2008)
Soler, R., Oliver, R., Ballester, J. L.
High-resolution observations show that oscillations and waves in prominence threads are common and that they are attenuated in a few periods. In addition, observers have also reported the presence of...
Transverse oscillations of flowing prominence threads observed with Hinode (2008)
Terradas, J., Arregui, I., Oliver, R., Ballester, J. L.
Recent observations with the Hinode Solar Optical Telescope display an active region prominence whose fine threads oscillate in the vertical direction as they move along a path parallel to the...
Terradas, J., Arregui, I., Oliver, R., Ballester, J. L., Andries, J., Goossens, M.
We study the excitation and damping of transverse oscillations in a multi-stranded model of a straight line-tied coronal loop. The transverse geometry of our equilibrium configuration is quite...
Soler, R., Oliver, R., Ballester, J. L.
Small-amplitude prominence oscillations are usually damped after a few periods. We study the attenuation of non-adiabatic magnetoacoustic waves in a slab prominence embedded in the coronal medium. We...
Magnetic arcades in stellar coronae. I. Cylindrical geometry (2007)
Cadez Oliver, R. Oliver, J. L. Ballester
. X-ray spectroscopy performed by different astronomical spacecrafts has shown that many active late-type stars possess coronae. For such reason, the magnetic structure of stellar coronae has raised...
Resonant Alfv'en waves in coronal arcades driven by footpoint motions (2007)
Ruderman Goossens, M. Goossens, J. L. Ballester, R. Oliver
. X-ray spectroscopy performed from different astronomical spacecrafts has shown that the solar corona is structured by magnetic fields having the shape of loops and arcades. These structures are...
Oscillatory Modes of a Prominence-PCTR-Corona Slab Model (2007)
Soler, R., Oliver, R., Ballester, J. L.
Oscillations of magnetic structures in the solar corona have often been interpreted in terms of magnetohydrodynamic waves. We study the adiabatic magnetoacoustic modes of a prominence plasma slab...
The statistical significance of the N-S asymmetry of solar activity revisited (2007)
Carbonell, M., Terradas, J., Oliver, R., Ballester, J. L.
The main aim of this study is to point out the difficulties found when trying to assess the statistical significance of the North-South asymmetry (hereafter SSNSA) of the most usually considered time...
Resonantly damped surface and body MHD waves in a solar coronal slab with oblique propagation (2007)
Arregui, I., Terradas, J., Oliver, R., Ballester, J. L.
The theory of magnetohydrodynamic (MHD) waves in solar coronal slabs in a zero-$\beta$ configuration and for parallel propagation of waves does not allow the existence of surface waves. When oblique...
Transverse oscillations of two coronal loops (2007)
Luna, M., Terradas, J., Oliver, R., Ballester, J. L.
We study transverse fast magnetohydrodynamic waves in a system of two coronal loops modeled as smoothed, dense plasma cylinders in a uniform magnetic field. The collective oscillatory properties of...
Soler, R., Oliver, R., Ballester, J. L.
Context. One of the typical features shown by observations of solar prominence oscillations is that they are damped in time and that the values of the damping times are usually between one and three...
Zaqarashvili, T. V., Oliver, R., Ballester, J. L.
Observations reveal an increase with height of the line width of several coronal spectral lines probably caused by outwardly propagating Alfv{\'e}n waves. However, the spectral line width sometimes...
Rossby waves in "shallow water" magnetohydrodynamics (2007)
Zaqarashvili, T. V., Oliver, R., Ballester, J. L., Shergelashvili, B. M.
The influence of a toroidal magnetic field on the dynamics of Rossby waves in a thin layer of ideal conductive fluid on a rotating sphere is studied in the "shallow water" magnetohydrodynamic...
Slow surface wave damping in plasmas with anisotropic viscosity and thermal conductivity (2000)
Ruderman, M.S., Oliver, R., Erdélyi, R., Ballester, J.L., Goossens, M.
This paper studies the damping of slow surface MHD waves propagating along the equilibrium magnetic field on a finite-thickness magnetic interface. The plasma is assumed to be strongly magnetised,...
Slow surface wave damping in plasmas with anisotropic viscosity and thermal conductivity (2000)
Ruderman, M.S., Oliver, R., Erdélyi, R., Ballester, J.L., Goossens, M.
This paper studies the damping of slow surface MHD waves propagating along the equilibrium magnetic field on a finite-thickness magnetic interface. The plasma is assumed to be strongly magnetised,...
Slow surface wave damping in plasmas with anisotropic viscosity and thermal conductivity (2000)
Ruderman, M.S., Oliver, R., Erdélyi, R., Ballester, J.L., Goossens, M.
This paper studies the damping of slow surface MHD waves propagating along the equilibrium magnetic field on a finite-thickness magnetic interface. The plasma is assumed to be strongly magnetised,...