Main Objective: The aim of the HOP is to obtain coordinated observations of the solar north pole between SO/PHI-HRT and Hinode/SP while the Solar Orbiter spacecraft reaches the highest latitude of this orbit.
Scientific Justification: The goal of this HOP is to acquire coordinated observations between the High Resolution Telescope (HRT) of the Polarimetric and Helioseismic Imager of Solar Orbiter (SO/PHI) and the Hinode spectropolarimeter (Hinode/SP), of the solar north pole on October 17-18 2024, during the Remote Sensing Window (RSW) 18 of the Solar Orbiter mission. SO/EUI and SO/SPICE will also support the SOOP from the Solar Orbiter side.
Solar Orbiter will be at a solar latitude of 7.6 deg on 17/18 October 2024, seeing the Sun from the highest latitude of the orbit, while being at 0.46 au from the Sun which yields a spatial resolution of 170 km on the Sun. The longitudinal separation angle between Solar Orbiter and Earth will be -26 deg, while the solar latitude of Earth will be 5.6 deg. This configuration allows to study details of the poles and, with Hinode support, provide two different points to model polar structures.
SO/PHI observations will cover the full period of the polar SOOP RS9_111 running from 22:00 on 17 October until 01:00 UT on 18 October 2024. The SOOP will be split into two observation periods. Solar Orbiter will be pointing to the north pole for the first period from 22:00 UT until 24:00 UT on 17 October. Then, from 00:00 UT until 01:00 UT on 18 October, the pointing will be slightly inside the disk, such that the northern limb can still be seen within the FOV of the high resolution telescopes of the instruments. The SO/PHI-HRT cadence will be variable, ranging from a cadence of 1 min up to a cadence of 30min.
SO/EUI will support the SO/PHI-HRT observations during the first two hours of the SOOP while the pointing is to the north pole, running the HRI-EUV at cadences of 10 seconds.
SO/SPICE will support the whole length of the SOOP with two polar limb rasters. One at the beginning of the pole pointing and the second covering the second pointing. |
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