Fig. 3From: Tristatic observation of polar mesosphere winter echoes with the EISCAT VHF radar on 8 January 2014: a case studyBackscattered power as a function of altitude over Tromsø (left panel, blue curve) and spectra of backscattered signal for different altitudes (right panel) as on the EISCAT real-time graph (RTG). Green and red curves (left panel) are power profiles which are not relevant for this study. Colour scale is an indicator of power spectral density in relative units. The title at the top contains information about experiment name, date, time, post-experiment integration, transmit power, azimuthal and elevation angle of the antennaBack to article page