We have been monitoring yearly variation in the Sun's polar magnetic fields with the Solar Optical Telescope aboard Hinode to record their evolution and...
The POLAR Investigation of the Sun (POLARIS) mission uses a combination of a gravity assist and solar sail propulsion to place a spacecraft in a 0.48 AU...
Polarimetric and spectroscopic optical observations of the ultra-compact X-ray binary 4U 0614+091
Aims: We present a polarimetric and spectroscopic study of the persistent ultra-compact X-ray binary 4U 0614+091 aimed at searching for the emission of a...
Polarimetric calibration of large-aperture telescopes. I. Beam-expansion method
A concept is described for the high-accuracy absolute calibration of the instrumental polarization introduced by the primary mirror of a large-aperture...
Polarimetric calibration of large-aperture telescopes. II. Subaperture method
A new method for absolute polarimetric calibration of large telescopes is presented. The proposed method is highly accurate and is based on the calibration of a...
Polarimetric characterization of segmented mirrors
We study the impact of the loss of axial symmetry around the optical axis on the polarimetric properties of a telescope with segmented primary mirror when each...
Polarimetric Diagnostics of Unresolved Chromospheric Magnetic Fields
For about a decade, spectropolarimetry of He I λ10830 has been applied to the magnetic diagnostics of the solar chromosphere. This resonance line is very...
Polarimetric Littrow Spectrograph - instrument calibration and first measurements
We present first measurements and the calibration procedure for the Polarimetric Littrow Spectrograph (POLIS) operated at the Vacuum Tower Telescope on Tenerife...