Astrophysical: Magnetic fields

  • Publication
    On the theory of MAG waves and a comparison with sunspot observations from CDS/SoHO
    We examine the influence of non-adiabatic effects on the modes of an isothermal stratified magnetic atmosphere. We present new solutions for magneto-acoustic...
  • Publication
    On the validity of quasi-linear kinematic mean-field electrodynamics in astrophysical flows
    Mean-field theory in its kinematic form with the quasi-linear approximation is widely used for the modelling of the transport of weak magnetic fields in...
  • Publication
    On the validity of the 630 nm Fe I lines for magnetometry of the internetwork quiet Sun
    Aims.The purpose of this work is to analyze the reliability of the magnetic field strengths inferred from the 630 nm pair of Fe i lines in internetwork quiet...
  • Publication
    Optical counterpart of the XTE J0929-314 in quiescence: constraints on the magnetic field
    We present VLT observations of the optical counterpart of th X-ray millisecond pulsar XTE J0929-314 in quiescence. We detected a very faint candidate in...
  • Publication
    Optical Tomography of a Sunspot. I. Comparison between Two Inversion Techniques
    A quantitative comparison between the Milne-Eddington (ME) inversion technique implemented by Skumanich & Lites and the SIR (Stokes Inversion based on Response...
  • Publication
    Optical Tomography of a Sunspot. II. Vector Magnetic Field and Temperature Stratification
    An observational determination of the three-dimensional magnetic and thermal structure of a sunspot is presented. It has been obtained through the application...
  • Publication
    Optical Tomography of a Sunspot. III. Velocity Stratification and the Evershed Effect
    The stratification with optical depth of the line-of-sight (LOS) velocity of a simple, isolated, round sunspot observed with the Advanced Stokes Polarimeter...
  • Publication
    Optical Tomography of a Sunspot: Preliminary Results
    Preliminary results of the inversion of spectropolarimetric maps of a sunspot observed with the Advanced Stokes Polarimeter (ASP) are presented. The method used...
  • Publication
    Optically Thin Irregularities in the Penumbrae of Sunspots
    Different estimates of the vertical gradient of magnetic field inclination in penumbrae disagree by 2 orders of magnitude. This disagreement may be resolved if...