Spatial relation between the 5-minute oscillations and granulation patterns.

Details Spatial relation between the 5-minute oscillations and granulation patterns. Spatial relation between the 5-minute oscillations and granulation patterns.

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...313..297e&link_type=abstract

Astronomy and Astrophysics, v.313, p.297-305

Astronomy and Astrophysics

Astrophysics

45

Sun: Photosphere, Granulation, Oscillations

Scientific paper

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 with the help of a specific filter, in the k-ω diagram. The surface of the Sun appears to be covered with adjacent oscillating cells of apparent size 2" (1500km) to 3" (2000km). Some cells are noticeable by their amplitude which is much larger than average. These strong oscillations usually appear in expanding intergranular spaces. Our observations suggest that the 5-min oscillations are stochastically generated by turbulent convection. However, the most energetic oscillations occur in downflows only, well separated of each other in time and space.

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