Sampoorna, M, Nagendra, K. N, Stenflo, J. O
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Hanle effect in the CN violet system with LTE modeling (2007)
Shapiro, A. I., Berdyugina, S. V., Fluri, D. M., Stenflo, J. O.
Weak entangled magnetic fields with mixed polarity occupy the main part of the quiet Sun. The Zeeman effect diagnostics fails to measure such fields because of cancellation in circular polarization....
A New Mechanism for Polarizing Light from Obscured Stars (2007)
Kuhn, J. R., Berdyugina, S. V., Fluri, D. M., Harrington, D. M., Stenflo, J. O.
Recent spectropolarimetric observations of Herbig AeBe stellar systems show linear polarization variability with wavelength and epoch near their obscured H-alpha emission. Surprisingly, this...
Hanle-Zeeman Redistribution Matrix. I. Classical Theory Expressions in the Laboratory Frame (2007)
Sampoorna, M, Nagendra, K. N, Stenflo, J. O
Polarized scattering in spectral lines is governed by a 4×4 matrix that describes how the Stokes vector is scattered and redistributed in frequency and direction. Here we develop the theory for this...
Are "EIT Waves" Fast-Mode MHD Waves? (2007)
Wills-Davey, M. J., DeForest, C. E., Stenflo, J. O.
We examine the nature of large-scale, coronal, propagating wave fronts (``EIT waves'') and find they are incongruous with solutions using fast-mode MHD plane-wave theory. Specifically, we consider...
First polarimetric measurements and modeling of the Paschen-Back effect in CaH transitions (2006)
Berdyugina, S. V., Fluri, D. M., Ramelli, R., Bianda, M., Gisler, D., Stenflo, J. O.
We report the first spectropolarimetric observations and modeling of CaH transitions in sunspots. We have detected strong polarization signals in many CaH lines from the A-X system, and we provide...
Dynamics of the solar convection zone and atmosphere (2005)
Ploner, Stefan R O, Schüssler, M, Solanki, S K, Stenflo, J O
Absence of linear polarization in Halpha emission of solar flares (2005)
Bianda, M., Benz, A. O., Stenflo, J. O., Kueveler, G., Ramelli, R.
High sensitivity observations of Halpha polarization of 30 flares of different sizes and disk positions are reported. Both filter and spectrographic techniques have been used. The ZIMPOL system...
Gisler, D., Schmid, H.M., Thalmann, C., Povel, H.P., Stenflo, J.O., Joos, F., ...
We present results from a phase A study supported by ESO for a VLT instrument for the search and investigation of extrasolar planets. The envisaged CHEOPS (CHaracterizing Extrasolar planets by...
Solar polarimetry in the near UV with the Zurich Imaging Polarimeter ZIMPOL II (2004)
Gandorfer, A. A., Povel, H. P., Steiner, P., Aebersold, F., Egger, U., Feller, A., ...
EUV brightness variations in the quiet Sun. (2000)
Brkovic, A., Rüedi, I., Solanki, S. K., Fludra, A., Harrison, R. A., Huber, M. C. E., ...
Coronal holes versus normal quiet Sun observed with SUMER. (1999)
Stucki, K., Solanki, S. K., Rüedi, I., Stenflo, J. O., Brković, A., Schühle, U., ...