Power density of the individual ion species (protons: red, alphas: blue, and cometary ions: grey) and total E ∙ J (black) along the x-axis. The dotted and dashed lines show the results of the low- and highalpha cases. In the upper panel the power density is integrated along the entire y- and z-axes. For the lower panel, we only integrate between y = ± 200 km along the y-axis. For the SW species the negative values are shown since these species mostly function as generators. The curve for the power density of alpha particles for the low-alpha case (dotted blue line) is scaled by a factor of 20 to improve visibility.