6 papers
On the modeling and mitigation of interference fringes in polarimetric instrumentation
Roberto Casini, David M. Harrington
Spectral and spatial fringes in polarized light are produced by the interference of transmitted and reflected waves at the interface between materials with different indexes of ref…
Image instabilities and polarization cross-talk
Roberto Casini, Alfred G. de Wijn
We expand on our previous study of the impact of atmospheric seeing on polarization cross-talk, and show how the formalism that was developed in that work can be applied to treat t…
Optimal polarization modulation and calibration schemes
Roberto Casini, David M. Harrington, Alfred G. de Wijn
We review the algebraic definition of the efficiency of a polarization modulation scheme, which is commonly adopted for solar and stellar spectro-polarimetry applications, and gene…
DKIST resolves sub-arcsec photospheric scattering polarization
Franziska Zeuner, Luca Belluzzi, Ernest Alsina Ballester +4
Scattering polarization signals offer a unique diagnostics of the physical conditions in the solar atmosphere, in particular magnetic fields via the Hanle effect. However, their sp…
Magnetic diagnostics of prominence eruptions through the Hanle effect of the He I 1083 nm line
Momchil Molnar, Roberto Casini
The magnetic field vector of the solar corona is not regularly and comprehensively being measured, because of the complexity and degeneracy inherently present in the types of obser…
A unifying polarization formalism for electric- and magnetic-multipole interactions
R. Casini, R. Manso Sainz, A. Lopez Ariste +1
We extend the spherical tensorial formalism for polarization to the treatment of electric- and magnetic-multipole transitions of any order. We rely on the spherical-wave expansion…