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Astron. Astrophys. 329, 276-290 (1998)


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Small-scale topology of solar atmosphere dynamics

I. Wave sources and wave diffraction

N.M. Hoekzema 1, R.J. Rutten 1, P.N. Brandt 2 and R.A. Shine 3

1 Sterrekundig Instituut, Postbus 80000, 3508 TA Utrecht, The Netherlands
2 Kiepenheuer-Institut für Sonnenphysik, Schöneckstr. 6, D-79104 Freiburg, Germany
3 Lockheed-Martin Advanced Technology Center, 91-30/252, 3251 Hanover St., Palo Alto CA 94304, USA

Received 26 May 1997 / Accepted 12 August 1997

Abstract

We study the small-scale topology of dynamical phenomena in the quiet-sun internetwork atmosphere, using short-duration Fourier analysis of high-resolution filtergram sequences to obtain statistical estimates for the co-location probability of different fine-structure elements and wave modes.

In this initial paper we concentrate on the topology of short-duration Fourier amplitude maps for the photosphere and the simultaneously observed overlying chromosphere. We find that these maps portray a complex mix of global modes and locally excited waves which necessitates a statistical approach. Various aspects including mesoscale patterning indicate the presence of subsurface wave sources and of subsurface wave diffraction by convective inhomogeneities.

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: November 24, 1997
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