Fig. 7From: Tristatic observation of polar mesosphere winter echoes with the EISCAT VHF radar on 8 January 2014: a case studyExperimental spectra of the signal received in Kiruna from 72.8 km (upper panel) and 69.5 km (lower panel) altitude for 12:00–13:00 UT at different times separated by 288 s (indicated by different colours)Back to article page