M. Kopf
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View article: THE SURFACE OF V410 TAURI
THE SURFACE OF V410 TAURI Open
We present Doppler images of the weak-lined T Tauri star V410 Tau obtained with two different Doppler-imaging codes. The images are consistent and show a cool extended spot, symmetric about the pole, at a temperature approximately 750 K be…
View article: Rotation and magnetic activity of the Hertzsprung-gap giant 31 Comae
Rotation and magnetic activity of the Hertzsprung-gap giant 31 Comae Open
\n Context. The single rapidly-rotating G0 giant 31 Comae has been a\npuzzle because of the absence of photometric variability despite\nits strong chromospheric and coronal emissions. As a Hertzsprung-gap giant, it is expected to be at the…
View article: Zeeman-Doppler Imaging of II Peg - Magnetic field restructuring from 2004 to 2007
Zeeman-Doppler Imaging of II Peg - Magnetic field restructuring from 2004 to 2007 Open
We present Zeeman-Doppler images of the active K2 star II Peg for the years 2004 and 2007. The surface magnetic field was reconstructed with our new ZDI code "iMap" which provides a full polarized radiative transfer driven inversion to sim…
View article: Zeeman-Doppler Imaging of active late-type stars
Zeeman-Doppler Imaging of active late-type stars Open
Stellar magnetic fields, as a crucial component of star formation and evolution, evade direct observation at least with current and near future instruments. However investigating whether magnetic fields are generated by a dynamo process or…
View article: Zeeman-Doppler imaging of II Peg
Zeeman-Doppler imaging of II Peg Open
We present Zeeman-Doppler images of the active K2 star II Peg for the years 2004 and 2007. The surface magnetic field was reconstructed with our new ZDI code iMap which provides a full polarized radiative transfer driven inversion to simul…
View article: A fast method for Stokes profile synthesis -- Radiative transfer modeling for ZDI and Stokes profile inversion
A fast method for Stokes profile synthesis -- Radiative transfer modeling for ZDI and Stokes profile inversion Open
The major challenges for a fully polarized radiative transfer driven approach to Zeeman-Doppler imaging are still the enormous computational requirements. In every cycle of the iterative interplay between the forward process (spectral synt…
View article: A fast method for Stokes profile synthesis
A fast method for Stokes profile synthesis Open
\n Context. The major challenges for a fully polarized radiative transfer driven approach \n to Zeeman-Doppler imaging are still the enormous computational requirements.\n In every cycle of the iterative interplay between the \n forward pr…
View article: Zeeman-Tomography of the Solar Photosphere -- 3-Dimensional Surface Structures Retrieved from Hinode Observations
Zeeman-Tomography of the Solar Photosphere -- 3-Dimensional Surface Structures Retrieved from Hinode Observations Open
AIMS :The thermodynamic and magnetic field structure of the solar photosphere is analyzed by means of a novel 3-dimensional spectropolarimetric inversion and reconstruction technique. METHODS : On the basis of high-resolution, mixed-polari…
View article: Zeeman-tomography of the solar photosphere
Zeeman-tomography of the solar photosphere Open
Aims.The thermodynamic and magnetic field structure of the solar photosphere is analyzed by means of a novel 3-dimensional spectropolarimetric inversion and reconstruction technique. Methods.On the basis of high-resolution, mixed-polarity …
View article: The meso-structured magnetic atmosphere
The meso-structured magnetic atmosphere Open
We present a general radiative transfer model which allows the Zeeman diagnostics of complex and unresolved solar magnetic fields. Present modeling techniques still rely to a large extent on a-priori assumptions about the geometry of the u…
View article: The Meso-Structured Magnetic Atmosphere -- A Stochastic Polarized Radiative Transfer Approach
The Meso-Structured Magnetic Atmosphere -- A Stochastic Polarized Radiative Transfer Approach Open
We present a general radiative transfer model which allows the Zeeman diagnostics of complex and unresolved solar magnetic fields. Present modeling techniques still rely to a large extent on a-priori assumptions about the geometry of the u…