Fig. 9From: On new two-dimensional UHF radar observations of equatorial spread F at the Jicamarca Radio ObservatorySame as Fig. 4. But now the images reveal the appearance of pre-dawn F-region echoes to the east of Jicamarca. Like in the case of the post-midnight event shown in Fig. 8, the pre-dawn echoes and associated irregularities were missed by the vertical beamBack to article page