Design of a Highly Efficient Polychromatic Full-Stokes Polarization Modulator for the CRISP Imaging Spectrometer

Graphic image depicting spectro-polarimetric data
Tuesday, February 2, 2021

In 2014 HAO built a polarimetric modulator for the CRISP instrument on the Swedish 1-m Solar Telescope in La Palma, using the principles of polychromatic modulation previously developed by HAO scientists. This paper discusses the processes by which the modulator was designed, built, and tested.

Ryan French

Ryan French is a visiting scientist in the High Altitude Observatory (HAO) at the National Center for Atmospheric Research (NCAR). Ryan is from the Mullard Space Science Laboratory (MSSL) at University College London (UCL), where he is a PhD student under the supervision of Prof.

Tanausú del Pino Alemán

Tanausú del Pino Alemán has a PhD in Physics from La Laguna University and the IAC. He is an expert in the applications of the quantum theory of spectral line polarization for the inference of solar magnetic fields.

Multiwavelength High-resolution Observations of Chromospheric Swirls in the Quiet Sun

Graphic image of chromospheric swirls
Wednesday, February 5, 2020

We report observations of small-scale swirls seen in the solar chromosphere. They are typically 2 Mm in diameter and last around 10 minutes.

Removal of Spectro-Polarimetric Fringes by 2D PCA

Graph depicting the transformation of the PCA basis through a series of carefully chosen rotations
Monday, February 25, 2019

We investigate the application of 2-dimensional Principal Component Analysis (2D PCA) to the problem of removal of polarization fringes from spectro-polarimetric data sets.

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