SPATIAL RELATION BETWEEN THE 5-MINUTE OSCILLATIONS AND GRANULATION PATTERNS

A white light, high resolution movie of the quiet photosphere has been used to study the spatial relation between the solar granulation and the 5-min oscillations of high degree mode (small spatial scale). The granular and oscillatory brightness components have been separated wit h the help of a specific filter, in the k-w diagram. The surface of th e Sun appears to be covered with adjacent oscillating cells of apparen t size 2'' (1500 km) to 3'' (2000 km). Some cells are noticeable by th eir amplitude which is much larger than average. These strong oscillat ions usually appear in expanding intergranular spaces. Our observation s suggest that the 5-min oscillations are stochastically generated by turbulent convection. However, the most energetic oscillations occur i n downflows only, well separated of each other in time and space.