West Pacific region is a high cumulus convection area, and is considered to be a source of global atmospheric circulation. Nevertheless, the mechanism of atmospheric circulation is not clarified because of sparseness of observation data. Equatorial Atmosphere Radar (EAR) was installed in West Sumatra in the Republic of Indonesia in March 2001. Specifications of the EAR are as follows:

(a) Location: 100.32E, 0.20S (b) Frequency: 47.0 MHz (c) Output power: 100 kW (Peak envelope) (d) Antenna system: Quasi-circular active phased array (110 m diameter, 560 three-element Yagis) (e) Beam width: 3.4 deg. (Half power, one-way) (f) Beam direction: Anywhere (within 30 deg. zenith angles) (g) Observation range: 1.5 km-20 km (Atmospheric turbulence), higher than 90 km (Ionospheric irregularity)

After a three month test observation, continuous observations including tropopause region has been performed since the end of June 2001.

In this presentation, we will show the system configuration and initial results of the EAR.