Abstract

In order to compare upper atmosphere phenomena between Brazilian geomagnetic anomaly region and inner radiation belt, we installed UVA/B and Imaging riometer at Punta Arenas (53.1 S, 289 E), Chile. Sometimes ozone hole reaches near Punta Arenas and the peak ultraviolet intensity becomes about 30% larger than the normal peak level at that time. Imaging riometer observation was just started on March, 2003. The preliminary results are also shown in this paper.