Astrophysical: Magnetic fields

  • Publication
    On the fine structure of sunspot penumbrae. II. The nature of the Evershed flow
    We investigate the fine structure of the sunspot penumbra by means of a model that allows for a flux tube in horizontal pressure balance with the magnetic...
  • Publication
    On the fine structure of sunspot penumbrae. III. The vertical extension of penumbral filaments
    In this paper we study the fine structure of the penumbra as inferred from the uncombed model (flux tube embedded in a magnetic surrounding) when applied to...
  • Publication
    On the Inversion of the Scattering Polarization and the Hanle Effect Signals in the Hydrogen Lyα Line
    Magnetic field measurements in the upper chromosphere and above, where the gas-to-magnetic pressure ratio β is lower than unity, are essential for understanding...
  • Publication
    On the Magnetic Field of Off-limb Spicules
    Determining the magnetic field related to solar spicules is vital for developing adequate models of these plasma jets, which are thought to play a key role in...
  • Publication
    On the Magnetic Nature of Quiet-Sun Chromospheric Grains
    Ca II K grains, i.e., intermittent, short-lived (about 1 minute), periodic (2-4 minutes), pointlike chromospheric brightenings, are considered to be the...
  • Publication
    On the Magnetism and Dynamics of Prominence Legs Hosting Tornadoes
    Solar tornadoes are dark vertical filamentary structures observed in the extreme ultraviolet associated with prominence legs and filament barbs. Their true...
  • Publication
    On the Moat-Penumbra Relation
    Proper motions in a sunspot group with a δ-configuration and close to the solar disk center have been studied by employing local correlation tracking techniques...
  • Publication
    On the nature of kink MHD waves in magnetic flux tubes
    Context: Magnetohydrodynamic (MHD) waves are often reported in the solar atmosphere and usually classified as slow, fast, or Alfvén. The possibility that these...
  • Publication
    On the origin of magnetic driven winds and the structure of the galactic dynamo in isolated galaxies
    We investigate the build-up of the galactic dynamo and subsequently the origin of a magnetic driven outflow. We use a set-up of an isolated disc galaxy with a...