Astrophysical: Magnetic fields

  • Publication
    Oscillations in the Photosphere of a Sunspot Umbra from the Inversion of Infrared Stokes Profiles
    We report on the detection of magnetic field strength and velocity oscillations in the photosphere of a sunspot umbra. Our analysis is based on the inversion of...
  • Publication
    Pair separation of magnetic elements in the quiet Sun
    The dynamic properties of the quiet Sun photosphere can be investigated by analyzing the pair dispersion of small-scale magnetic fields (i.e., magnetic elements...
  • Talk
    Parker spontaneous current-sheets in topologically untwisted magnetic fields
    A continuous magnetic field evolving under the hydromagnetic frozen-in condition preserves its field topology. Depending on that field topology, the evolving...
  • Publication
    PCA detection and denoising of Zeeman signatures in polarised stellar spectra
    Aims: Our main objective is to develop a denoising strategy to increase the signal to noise ratio of individual spectral lines of stellar spectropolarimetric...
  • Publication
    Penumbral thermal structure below the visible surface
    Context. The thermal structure of the penumbra below its visible surface (i.e., τ5 ≥ 1) has important implications for our present understanding of sunspots and...
  • Publication
    Periodic Radio and Hα Emission from the L Dwarf Binary 2MASSW J0746425+200032: Exploring the Magnetic Field Topology and Radius Of An L Dwarf
    We present an 8.5 hr simultaneous radio, X-ray, UV, and optical observation of the L dwarf binary 2MASSW J0746425+200032. We detect strong radio emission...
  • Publication
    Persistent magnetic vortex flow at a supergranular vertex
    Context. Photospheric vortex flows are thought to play a key role in the evolution of magnetic fields. Recent studies show that these swirling motions are...
  • Publication
    Pervasive Linear Polarization Signals in the Quiet Sun
    This paper investigates the distribution of linear polarization signals in the quiet-Sun internetwork using ultra-deep spectropolarimetric data. We reduce the...
  • Publication
    Phase diversity restoration of sunspot images. II. Dynamics around a decaying sunspot
    Two time series, taken simultaneously in the G-band and in white-light, and corrected for telescope aberrations and turbulence perturbations using the method of...