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Fig. 1 | Earth, Planets and Space

Fig. 1

From: VHF radar measurements of momentum flux using summer polar mesopause echoes

Fig. 1

Beam arrangement of the mobile SOUSY VHF radar showing the 3-dB beam widths. Beams are directed vertically, and at 4° off-zenith towards the north-east, north-west and south-west, and at 5.6° off-zenith towards the north and west. At a height of 86 km, the distance from the zenith to centres of the 4.0° off-zenith beams is about 6 km, and for the 5.6° off-zenith beams, 8.4 km. The beam diameters are about 4 km at this height

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