Seasonal and Local Time Variations of E-Region Field-Aligned Irregularities Observed with 30.8-MHz Radar at Kototabang, Indonesia

Table 1

Specifications of the VHF radar at Kototabang.

Location	0.20°S, 100.32°E
Dip latitude	10.36°S
Operating frequency	30.8 MHz
Antenna	Linear array of 18 three-element Yagi antennas
Gain	22 dBi
Beam width	12° in azimuth (half-power full-width) 40° in zenith (half-power full-width)
Beam steering	Active phase control Azimuthal beam directions between +54° and −54° at 13° step
Transmitter	Solid-state pulse transmitter
Peak power	20 kW
Average power	1.5 kW
Pulse width	1–200 μs
Subpulse width	1, 2, 4, 8, 16 μs
Receiver	Single coherent receiver
A/D converter	16 bit