Speaker
Description
First Name: Artem
Last Name: Ulyanov
Email Address: ulyanov@mps.mpg.de
Affiliation: Max Planck Institute for Solar System Research
All Authors: Artem Ulyanov, Sami Solanki, Daniele Calchetti, Johann Hirzberger, Hanna Strecker, Gherardo Valori, and David Orozco Suárez
Abstract: The properties of the polar magnetic flux represent one of the missing elements shaping our understanding of how the Sun's magnetic field is generated and transported on global scales. In the pre-Solar Orbiter era, observations of polar fields made from the Earth's perspective were limited by the low signal-to-noise ratio. As a result, integration of numerous measurements, either in space or time, was needed, smearing the overall resolution. This, in turn, inevitably affected how well existing theoretical models could reproduce the observations. The Solar Orbiter's orbit provides a unique opportunity to observe the solar magnetic field in full coverage and resolution. We took advantage of the SO/PHI-FDT instrument capabilities to recover the nearly full-Sun picture of the photospheric magnetic field distribution during the first out-of-ecliptic campaigns in spring and autumn 2025. Our preliminary analysis shows that the polar regions are dominated by unipolar magnetic elements with a mean unsigned value of around 2G. We also report that the distribution of magnetic flux with latitude is seemingly flat above 60 degrees, in contrast to previous studies. We are looking forward to the upcoming high-latitude campaigns to be able to trace the evolution of polar fields throughout the solar cycle.