Astrophysical: Magnetic fields

  • Publication
    Dichroic Masers Due to Radiation Anisotropy and the Influence of the Hanle Effect on the Circumstellar SiO Polarization
    The theory of the generation and transfer of polarized radiation, mainly developed for interpreting solar spectropolarimetric observations, allows us to...
  • Publication
    Direct Imaging of Fine Structure in the Chromosphere of a Sunspot Umbra
    High-resolution imaging observations from the Hinode spacecraft in the Ca II H line are employed to study the dynamics of the chromosphere above a sunspot. We...
  • Publication
    Discovery of Hα satellite emission in a low state of the SW Sextantis star BB Doradus
    BB Dor was observed during its low state in 2009. Signatures of both binary components are revealed in the average optical spectrum; no signature of accretion...
  • Publication
    Discovery of long-period magnetic field oscillations and motions in isolated sunspots
    We analyse the temporal evolution of the inclination component of the magnetic field vector for the penumbral area of 25 isolated sunspots. Compared to previous...
  • Publication
    Discovery of Scattering Polarization in the Hydrogen Lyα Line of the Solar Disk Radiation
    There is a thin transition region (TR) in the solar atmosphere where the temperature rises from 10,000 K in the chromosphere to millions of degrees in the...
  • Publication
    Discovery of the `missing' mode in HR1217 by the Whole Earth Telescope
    HR1217 is a prototypical rapidly oscillating Ap star that has presented a test to the theory of non-radial stellar pulsation. Prior observations showed a clear...
  • Publication
    Distribution of magnetic flux on the solar surface and low-degree p-modes
    The frequencies of solar p-modes are known to change over the solar cycle. There is also recent evidence that the relation between frequency shift of low-degree...
  • Publication
    Distribution of starspots on cool stars. I. Young and main sequence stars of 1Msun_.
    Sunspots are restricted to a latitude band within 30degof the solar equator. In contrast, the latitudes of spots on the surfaces of rapidly rotating cool stars...
  • Publication
    Does equipartition hold in HFPs?
    Equipartition of energy between relativistic particles and magnetic field is known to be consistent with observations in most of the large size (hundreds of kpc...