40 citations · 142 across the 12 of their papers we have counts for
14 papers
Error Propagation from Integral Moments and Spectral Derivatives of Stokes Profiles to Magnetic Observables
Roberto Casini
We aim to derive convenient analytic estimations of magnetic inference errors, which can be used to inform and facilitate the creation of the science-traceability matrix of a polar…
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…
On the Intensity Distribution Function of Blazed Reflective Diffraction Gratings
R. Casini, P. G. Nelson
We derive from first principles the expression for the angular/wavelength distribution of the intensity diffracted by a blazed reflective grating, according to a scalar theory of d…
On the Instrument Profile of Slit Spectrographs
R. Casini, A. G. de Wijn
We derive an analytic expression for the instrument profile of a slit spectrograph, also known as the line spread function. While this problem is not new, our treatment relies on t…
Diagnosis of Magnetic and Electric Fields of Chromospheric Jets through Spectropolarimetric Observations of HI Paschen Lines
Tetsu Anan, Roberto Casini, Kiyoshi Ichimoto
Magnetic fields govern the plasma dynamics in the outer layers of the solar atmosphere, and electric fields acting on neutral atoms that move across the magnetic field enable us to…
Improved search of PCA databases for spectro-polarimetric inversion
R. Casini, A. Asensio Ramos, B. W. Lites +1
We describe a simple technique for the acceleration of spectro-polarimetric inversions based on principal component analysis (PCA) of Stokes profiles. This technique involves the i…
Analysis of Seeing-Induced Polarization Cross-Talk and Modulation Scheme Performance
Roberto Casini, Alfred G. de Wijn, Philip G. Judge
We analyze the generation of polarization cross-talk in Stokes polarimeters by atmospheric seeing, and its effects on the noise statistics of spectropolarimetric measurements for b…
Multi-line Stokes inversion for prominence magnetic-field diagnostics
R. Casini, A. Lopez Ariste, F. Paletou +1
We present test results on the simultaneous inversion of the Stokes profiles of the He I lines at 587.6 nm (D_3) and 1083.0 nm in prominences (90-deg scattering). We created datase…
Scattering polarization of hydrogen lines in the presence of turbulent electric fields
R. Casini, R. Manso Sainz
We study the broadband polarization of hydrogen lines produced by scattering of radiation, in the presence of isotropic electric fields. In this paper, we focus on two distinct pro…