Astrophysical: Magnetic fields

  • Publication
    The Physical Origin of the Scattering Polarization of the Na I D Lines in the Presence of Weak Magnetic Fields
    We demonstrate that the atomic alignment of the hyperfine-structure components of the ground-level S1/2 of Na I and of the upper-level P1/2 of the D1 line are...
  • Publication
    The Physics of Twisted Magnetic Tubes Rising in a Stratified Medium: Two-dimensional Results
    The physics of a twisted magnetic flux tube rising in a stratified medium is studied using a numerical MHD code. The problem considered is fully compressible...
  • Publication
    The Polarimetric and Helioseismic Imager on Solar Orbiter
    Aims: This paper describes the Polarimetric and Helioseismic Imager on the Solar Orbiter mission (SO/PHI), the first magnetograph and helioseismology instrument...
  • Publication
    The polarization angle in the wings of Ca I 4227: A new observable for diagnosing unresolved photospheric magnetic fields
    Context. When observed in quiet regions close to the solar limb, many strong resonance lines show conspicuous linear polarization signals, produced by...
  • Publication
    The Polarization Signature of Photospheric Magnetic Fields in 3D MHD Simulations and Observations at Disk Center
    Before using three-dimensional (3D) magnetohydrodynamical (MHD) simulations of the solar photosphere in the determination of elemental abundances, one has to...
  • Publication
    The Polarization-Free Approximation Applied to Multi-Level Non-LTE Radiative Transfer
    The polarization-free (POF) approximation (Trujillo Bueno and Landi Degl'Innocenti, 1996) is capable of accounting for the approximate influence of the magnetic...
  • Publication
    The Possible Ascent of a Closed Magnetic System through the Photosphere
    We present a comprehensive interpretation of the evolution of a small magnetic region observed during its entire disk passage. The vector magnetic field...
  • Publication
    The possible origin of facular brightness in the solar atmosphere
    This paper studies the dependence of the Ca ii H line core brightness on the strength and inclination of the photospheric magnetic field, and on the parameters...
  • Publication
    The profuse optically-thin irregularities of the photospheric magnetic fields
    The highly irregular nature of most photospheric magnetic fields is analyzed here, trying to emphasize the connection between photospheric fluctuations and...