Speaker
Description
First Name: Daniele
Last Name: Calchetti
Email Address: calchetti@mps.mpg.de
Affiliation: MPS
All Authors: D. Calchetti, S. Solanki, J. Hirzberger, G. Valori, D. Orozco, J. Blanco, T. Oba, H. Strecker, A. Ulyanov
Abstract: Direct remote-sensing observations of the solar poles have been hindered by the restricted view obtained from the ecliptic plane. For the first time ever, Solar Orbiter with its remote-sensing instruments observed the poles of the Sun from out of the ecliptic in the Spring of 2025. Here we report the first measurements of the magnetic field of the solar poles taken when Solar Orbiter was at heliographic latitudes ranging between 14.9 and 16.7 degree. The data-sets were collected by the High Resolution Telescope of the Polarimetric and Helioseismic Imager (SO/PHI-HRT) on board Solar Orbiter. Two sets of observations, approximately one month apart, for the south and north pole are considered in this work. The magnetic flux and flux density measured during these campaigns are reported as a function of the heliographic latitude observed by HRT. The net fluxes show a different latitudinal distribution for the two polar caps. We also discuss the observed dependence of the measured fluxes on the viewing angle. In addition, the north pole high resolution data acquired in October 2025 will be briefly presented and commented.