Astrophysical: Magnetic fields

  • Publication
    The singular behaviour of ambipolar diffusion revealed by 1D Cartesian solutions
    Context. Ambipolar diffusion is increasingly recognised as a key process in the lower solar atmosphere. Its highly non-linear behaviour has many non-intuitive...
  • Publication
    The Solar Internetwork. I. Contribution to the Network Magnetic Flux
    The magnetic network (NE) observed on the solar surface harbors a sizable fraction of the total quiet Sun flux. However, its origin and maintenance are not well...
  • Publication
    The Solar Internetwork. II. Flux Appearance and Disappearance Rates
    Small-scale internetwork magnetic fields are important ingredients of the quiet Sun. In this paper we analyze how they appear and disappear on the solar surface...
  • Publication
    The Spectrum of Fluctuations across Penumbral Filaments
    We estimate the typical spectrum of spatial fluctuations of intensity due to the penumbral filaments. High angular resolution continuum images are used (cut-off...
  • Publication
    The subsurface structure of sunspots and the origin of solar active regions
    Several topics concerning the subsurface structure and evolution of sunspots are discussed. These include the morphology and stability of the magnetized plasma...
  • Publication
    The Sunrise Mission
    The first science flight of the balloon-borne Sunrise telescope took place in June 2009 from ESRANGE (near Kiruna/Sweden) to Somerset Island in northern Canada...
  • Publication
    The Temperature - Magnetic Field Relation in Observed and Simulated Sunspots
    Observations of the relation between continuum intensity and magnetic field strength in sunspots have been made for nearly five decades. This work presents full...
  • Publication
    The Thermal and Magnetic Structure of Umbral Dots from the Inversion of High-Resolution Full Stokes Observations
    This paper presents the analysis of high-resolution Stokes observations of eight different umbral dots in a sunspot. The spectra were recorded with the La Palma...
  • Publication
    The Three-dimensional Interaction between Emerging Magnetic Flux and a Large-Scale Coronal Field: Reconnection, Current Sheets, and Jets
    Using MHD numerical experiments in three dimensions, we study the emergence of a bipolar magnetic region from the solar interior into a model corona containing...