Solar wind measurements taken in situ at PSP. Top panel: bulk velocity (left axis) and density of the proton solar wind (right axis) measured by the Solar Probe Analyzer (SPAN-i), which is part of the Solar Wind Electrons Alphas and Protons (SWEAP; Kasper et al. 2016) investigation. Middle panel: magnetic field (1 min average) measured by the magnetometer (MAG) of the FIELDS instrument suite (Bale et al. 2016). Bottom panel: radial distance to the Sun and Carrington longitude of PSP. A few days after the April 2021 event observed by WISPR-I, PSP sampled a very dense and slow solar wind typical of HPS, with several magnetic polarity inversions suggesting potential crossings of the HCS. Figure produced with the AMDA web tool publicly available at http://amda.irap.omp.eu/.