Author: Marco Romoli and the Metis Team
Affiliation: University of Florence, Italy
METIS coronagraph is designed to observe the solar corona with an annular field of view from 1.5 to 2.9 degrees in the visible broadband (580-640 nm) and in the UV HI Lyman-alpha, during the Sun close approaching and high latitude tilting orbit of Solar Orbiter. Solar Orbiter is planned to be launched in October 2018 and will reach the operative orbit in 2021. It can simultaneously image the visible and ultraviolet emission of the solar corona and diagnose, with unprecedented temporal coverage and spatial sampling element (down to about 4000 km), the structure and dynamics of the full corona in the range from 1.6 to 3.0 solar radii (Rs) at minimum perihelion (0.28 AU), and from 2.8 to 5.5 Rs at 0.5 AU. This region is crucial in linking the solar atmosphere phenomena to their evolution in the inner heliosphere, and the study of its properties is very important in meeting the Solar Orbiter fundamental science goals.
After a description of the instrument and its performance, the scientific objectives and how Metis will accomplish them is given.