Astrophysical: Solar atmosphere

  • Publication
    Magnetic field measurements
    Techniques involved in measurements of solar magnetic field are based on the observation and interpretation of the polarization signal in suitable Fraunhofer...
  • Publication
    Magnetic field strength in solar flux tubes - A model atmosphere independent determination
    The "line ratio method" (Stenflo, 1973) has been extensively used in the past to carry out measurements of the magnetic field strength in spatially unresolved...
  • Publication
    Multidimensional energy transfer by radiation in the solar atmosphere
    Both linear and nonlinear analysis are used to gain a better understanding of the effects of multi-dimensional transfer of energy by radiation in spatially...
  • Publication
    Multidimensional radiative transfer with multilevel atoms. 1: ALI method with preconditioning of the rate equations
    We combine a number of powerful mathematical techniques to produce an effective method for treating multidimensional radiative transfer problems in complex...
  • News
    New data about spiral waves detected in sunspots
    An international study, led by researchers at the IAC, reveal unknown details about the nature of a singular type of oscillatory phenomenon in spiral form...
  • Publication
    NLTE effects in iron spectrum of sunspots.
    Not Available
  • Publication
    Nonlinear flows along magnetic flux tubes - Mathematical structure and exact simple wave solutions
    The mathematical structure of nonlinear, isentropic longitudinal flows of an ideal magnetohydrodynamic plasma confined to a magnetic flux tube embedded in a...
  • Publication
    Nonlinear time-evolution of kink-unstable magnetic flux tubes in the convection zone of the Sun
    The nonlinear development of the kink instability of a magnetic flux tube initially lying in mechanical equilibrium in the deep convection zone is presented...
  • Publication
    Numerical test of a new v-profile inversion technique
    The diagnostic method proposed by Landi Degl'Innocenti and Landolfi (1982), based on the observation of circular polarization, has been generalized to derive...