RUN1 simulation results at the time of arrival of the CME-driven shock at the HENON virtual spacecraft, indicated as HNN (see legend), positioned directly in front of the Earth, along the Sun-Earth line. Top row: detrended density in the equatorial plane (left) and in the meridional plane (right), with the colorbar on the right-hand side (panel a). Bottom row: radial velocity in the equatorial plane (left) and in the meridional plane (right), with the colorbar on the right-hand side (panel b). A yellow dot indicates the Earth’s position, while green squares indicate the virtual spacecraft locations. In the inset we indicated the geocentric position of the virtual spacecraft in different colors.