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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
Received 26 May 1997 / Accepted 12 August 1997
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