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The influence of coronal EUV irradiance on the emission in the He I 10830 A and D3 multiplets
R. Centeno, J. Trujillo Bueno, H. Uitenbroek +1
Two of the most attractive spectral windows for spectropolarimetric investigations of the physical properties of the plasma structures in the solar chromosphere and corona are the…
The solar chromosphere at high resolution with IBIS. I. New insights from the Ca II 854.2 nm line
G. Cauzzi, K. P. Reardon, H. Uitenbroek +7
(Abridged) Aims: In this paper, we seek to establish the suitability of imaging spectroscopy performed in the Ca II 854.2 nm line as a means to investigate the solar chromosphere a…
The discrepancy in G-band contrast: Where is the quiet Sun?
Han Uitenbroek, Alexandra Tritschler, Thomas Rimmele
We compare the rms contrast in observed speckle reconstructed G-band images with synthetic filtergrams computed from two magneto-hydrodynamic simulation snapshots. The observations…
Narrow-band Imaging in the CN Band at 388.33 nm
Han Uitenbroek, Alexandra Tritschler
We promote the use of narrow-band (0.05 -- 0.20 nm FWHM) imaging in the molecularvCN band head at 388.33 nm as an effective method for monitoring small-scale magnetic field element…
On the fine structure of the quiet solar \Ca II K atmosphere
Alexandra Tritschler, Wolfgang Schmidt, Han Uitenbroek +1
We investigate the morphological, dynamical, and evolutionary properties of the internetwork and network fine structure of the quiet sun at disk centre. The analysis is based on a…
Observation of the Molecular Zeeman Effect in the G band
A. Asensio Ramos, J. Trujillo Bueno, M. Bianda +2
Here we report on the first observational investigation of the Zeeman effect in the G band around 4305 A. Our spectropolarimetric observations of sunspots with the Zurich Imaging P…