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Multi-beam observations of the daytime ionospheric  E-region irregularities and the so-called 150-km echoes with  the 47-MHz Equatorial Atmosphere Radar (EAR) in  West Sumatra, Indonesia (0.20° S, 100.32° E,  10.36° S dip latitude) are presented.  150-km echoes have been frequently observed by the EAR,  and their characteristics are basically the same as  the equatorial ones, except for an intriguing zonal asymmetry;  stronger echoes in lower altitudes in the east directions,  and weaker echoes in higher altitudes in the west.  The highest occurrence is seen at  5.7° east with respect to the magnetic meridian,  and the altitude gradually  increases as viewing from the east to west.  Arc structures which return backscatter echoes  are proposed to explain the asymmetry.  While the strength of radar echoes below 105 km is uniform  within the wide coverage of azimuthal directions,  the upper E-region (105–120 km) echoes also show  a different type of zonal asymmetry, which should be generated  by an essentially different mechanism from  the lower E-region and 150-km echoes

Zonal asymmetry of daytime 150-km echoes observed by Equatorial Atmosphere Radar in Indonesia