Proceedings with Extended Abstracts (single PDF file) - Radio ...

• Period 1 (June 1-10): SCCs exist on the west side of Sumatera,• Period 2 (June 11-16): SCCs exist over Sumatera,• Period 3 (June 17-30): SCCs exist on the east side of Sumatera.During Period 2, two SCCs pass over Sumatera. The first SCC reaches the radar site on 11June, and the second one exist over the radar site during 14-16 June.Figure 2 shows the time-altitude plot of the EAR zonal wind in June 2002. Zonal wind isaveraged every four hours. Zonal wind at 2-4 km altitude is easterly or weak westerly inPeriods 1 and 2. On 17 June 2002, when SCCs passed over Sumatera, a westerly wind burstwith amplitude of >10 m s -1 is observed in 2-3 km altitude. After that, westerly wind prevailsin 2-4 km altitude. The tropopause-level Kelvin waves are seen at 16-20 km altitudes, as wasshown in other studies (e.g., Fujiwara and Takahashi, 2001; Fujiwara et al., 2003).Figure 1: Time-longitude plot of T BB averaged over 0.3S-0.1S in June 2002. Horizontal solidline indicates the longitude of the radar site (100.32E).Figure 2: Time-altitude plot of zonal wind observed with the EAR in June 2002.267