Speaker
Description
First Name: Hanna
Last Name: Strecker
Email Address: streckerh@iaa.es
Affiliation: Instituto de Astrofísica de Andalucía (IAA-CSIC) and Spanish Space Solar Physics Consortium, Granada, Spain
All Authors: David Orozco Suárez; Instituto de Astrofísica de Andalucía (IAA-CSIC) and Spanish Space Solar Physics Consortium, Granada, Spain; Gherardo Valori; MPS Göttingen, Germany; Artem Ulyanov; MPS, Göttingen, Germany; Sami Solanki, MPS, Göttingen, Germany; Johann Hirzberger; MPS, Göttingen, Germany; Julian Blanco Rodríguez; Universitat de València and Spanish Space Solar Physics Consortium, Valencia, Spain; Daniele Calchetti; MPS, Göttingen, Germany; Sami Solanki, MPS, Göttingen, Germany; Jose Carlos del Toro Iniesta, Instituto de Astrofísica de Andalucía (IAA-CSIC) and Spanish Space Solar Physics Consortium, Granada, Spain; And the SO/PHI team
Abstract: The magnetic flux distribution on the solar surface is typically reconstructed from Earth-based observations over one Carrington rotation, yet synoptic maps cannot directly capture the magnetic field on the far side of the Sun. In this study, we combine magnetic flux distributions from Earth-based observatories with far-side measurements from SO/PHI to evaluate how well the synoptic reconstruction represents the true flux on the hidden hemisphere. The Solar Orbiter mission, currently in operations for over five years during which it has passed five superior conjunctions provides repeated and unique far-side coverage during the rising phase of the solar cycle. We identify active regions observed by SO/PHI on the far side, determine their magnetic flux and field strength, and compare these values with the flux in synoptic maps for the corresponding Carrington rotations. This approach allows us to measure systematic under- or over-estimation of far-side magnetic features and to assess the role of persistent active longitudes. Our results quantify the far-side flux not captured in synoptic maps and underline the importance of Solar Orbiter’s viewpoint for improving global magnetic field models.