Fig. 2From: Impact of lithium releases on ionospheric electron density observed by impedance probe during WIND campaignExamples of the c(f) curves obtained using the NEI during the ascending (left panels) and descending (right panels) phases. Left and right panels in each row are the c(f) curves obtained at approximately the same altitude. Each arrow in each panel indicates the frequency of fUHR. The c(f) curves of the panels (f), (g) and (h) were obtained after starting the lithium release experiment.Back to article page