Fig. 4.From: Mesosphere summer echoes observed with the SuperDARN Hokkaido HF radar at Rikubetsu, Japan (43.5°N)(a) RTV plots on HF radar beams 1, 3, 5, 11, 13 and 15, (b) Doppler velocity maps at 0715 and 0735 JST, and (c) horizontal wind vectors (averaged over 12 min) on 16 June 2009.Back to article page