Speaker
Description
Metis, the coronagraph on board Solar Orbiter, is an externally occulted instrument with a field of view (FOV) spanning 1.7°–3.4°, which, over the course of a typical spacecraft orbit, corresponds to heliocentric distances from 1.7 to about 10 solar radii. Metis operates with two radiometric channels: one measures coronal emission in a narrow ultraviolet (UV) band centered on the H I Lyman-α line, while the other records broadband visible light (VL) in linearly polarized intensity.
In this work, we present a statistical analysis of the linearly polarized brightness (pB) measured over Solar Cycle 25 as a function of heliocentric height and polar angle, based on the updated Metis calibration released with Data Release 2. We also compare these results with published pB values obtained from eclipse observations, as well as from both ground-based and space-borne coronagraphs.
