Shown in color is the total power density (panels a, b), the divergence of the Poynting flux (panels c, d), and the time derivative of the electromagnetic energy density (panels e, f), for the y = 0 and z = 0 planes around the comet at 1.5 AU during weakly ionizing solar conditions. The Poynting theorem states that the sum of these three quantities should be zero for all points. The arrows in (panels c, d) mark the direction of the Poynting flux, S = E ×B∕μ₀, and their sizes are proportional to the magnitude. The comet nucleus is marked by black crosshairs. The local geometry for each rowof panels is shown to the right of the figure.