Selected science highlights from the SO/PHI vector magnetograph on Solar Orbiter

Speaker: Sami Solanki

Apr 8, 2026 10:00 PDT

The Polarimetric and Helioseismic Imager (PHI) on Solar Orbiter (SO) has been in operation for 4 years now and in this time has produced a number of firsts. These build on being the first magnetograph to observe the Sun from outside the Sun-Earth line, including obtaining magnetograms of the Sun’s far side, as well as being the first magnetograph to observe the Sun from outside the ecliptic. With its two telescopes, SO/PHI can either image the whole Sun or a smaller field of view at high resolution, with the exact resolution achieved depending on the phase of Solar Orbiter’s orbit around the Sun. In this talk I’ll present some of the science highlights resulting from the gathered data. These include: first magnetic field and velocity maps of the poles from outside the ecliptic; first determination of two velocity components directly from Doppler velocity measurements; first stereoscopic determination of the Wilson depression; nearly seamless evolution of the magnetic field of solar active regions, and much more.