Fig. 8From: \(\textrm{O}^+\) density distribution in the nightside ionosphere reconstructed from ISS-IMAP/EUVI dataThe diagonal elements of the matrix \(\textbf{R}_H\) (upper), \(\textrm{O}^+\) distribution estimated from synthetic images in the region where the diagonal element is below 0.2 (middle), and the difference between the estimate and the IRI model in the region where the diagonal element is below 0.2 (lower)Back to article page