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Astron. Astrophys. 329, 725-734 (1998)

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Small-scale topology of solar atmosphere dynamics

II. Granulation, K2v grains and waves

N.M. Hoekzema and R.J. Rutten

Sterrekundig Instituut, Postbus 80000, 3508 TA Utrecht, The Netherlands

Received 26 May 1997 / Accepted 12 August 1997


We continue studying the small-scale topology of dynamical phenomena in the quiet-sun internetwork atmosphere through statistical estimation of the co-location probability of different fine-structure elements and wave modes. In this paper we chart spatial alignments between the granular brightness structuring of the photosphere, Ca II K [FORMULA] brightness patterns in the chromosphere, and wave amplitude patterns in both regimes as a function of time delay between the occurrences of the various features. These charts confirm the presence of excess 2-4 min waves above dark intergranular lanes, the absence of excess 5 min waves above bright granules, the absence of expected alignments between photospheric and chromospheric wave patterning, and the broad-band nature of Ca II K [FORMULA] grain formation. In addition, they show significant alignments at large time delays that seem to be regulated by mesoscale patterning and pattern migration.

Key words: Sun: atmosphere – Sun: photosphere – Sun: chromosphere – Sun: granulation – Sun: oscillations

Send offprint requests to: R.J. Rutten

© European Southern Observatory (ESO) 1998

Online publication: December 8, 1997