Astrophysical: Solar atmosphere

  • Publication
    Fe I lines in the spectra of cool stars: NLTE effects in solar-like atmospheres.
    A detailed NLTE investigation of Fe I lines is carried out within the framework of the MACKKL model of the quiet solar atmosphere. The authors used a realistic...
  • Talk
    Flares: highly energetic explosions on the Sun
    Flares are among the most energetic magnetic solar phenomena. They are often accompanied by ejections of charged particles, which have a direct influence on the...
  • Publication
    Forces on magnetic flux tubes moving in inhomogeneous flows
    The back-reaction of an incompressible two-dimensional flow of constant strain to the accelerated motion of a straight cylinder is calculated in the general...
  • Publication
    Further implications of solar p-modes as measured in NA and K resonance lines
    The ratios between the amplitudes of p-modes measured simultaneously in the Na and K resonance lines are compared with the expected ratios for adiabatic waves...
  • Publication
    Inversion of Stokes profiles
    An inversion code of Stokes line profiles is presented. It allows the recovery of the stratification of the temperature, the magnetic field vector, and the line...
  • Publication
    Limitations of the Ca II 8542 Å Line for the Determination of Magnetic Field Oscillations
    Chromospheric umbral oscillations produce periodic brightenings in the core of some spectral lines, known as umbral flashes. They are also accompanied by...
  • Publication
    Linewidths of low-degree acoustic modes of the sun
    Estimates of the spectral linewidths of low degree (l = 0 and l = 1), 5-min p-modes obtained from Doppler shift observations in 1984 (63 d) and 1986 (63 d) are...
  • Publication
    Long Characteristics versus Short Characteristics in 3D Radiative Transfer Simulations of Polarized Radiation
    We compare maps of scattering polarization signals obtained from three-dimensional (3D) radiation transfer calculations in a magnetoconvection model of the...
  • Publication
    LTE polarized radiative transfer through interlaced atmospheres
    We show that the solution of the radiative transfer equation (RTE) through a line of sight that pierces several times two alternate atmospheres can be obtained...