A spectral ratio, similar to that of von der Lühe (1984), is proposed to derive information on the degradation of the mean granular power spectrum at a position...
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PublicationNumerical determination of the modulation transfer function from observations of granulation outside the disk centre.
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PublicationPhotometry and spectroscopy of the solar granulation along the polar axis and equator
From high-resolution CCD images of granulation obtained at the Swedish Solar Tower of the Observatorio del Roque de los Muchachos at different positions on the...
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PublicationPhotometry of light-bridges in sunspots
The decay of a sunspot region was studied using high resolution white-light pictures. The photometric and geometric parameters of a light-bridge showing...
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PublicationSpatially highly resolved time series of solar granulation spectra.
Not Available
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PublicationSunspot populations and their relation with the solar cycle
The joint consideration of theoretical and observational arguments is used to conclude that two different spot populations co-exist in the Sun.
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PublicationThe flux rope models checked by some observations
High resolution H alpha and white light observation of the birth of 73 active regions (AR) were used to check models of sunspots. It is concluded that large AR...
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PublicationThe observation of intrinsically different emergences for large and small active regions
The analysis of high-resolution H-alpha and white-light observations on the emergence of 73 active regions shows an intrinsically different behavior for both...
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PublicationThe observed background solar velocity noise
Using accurate radial velocity observations of integral sunlight, the background solar velocity noise has been measured at different frequencies of interest for...
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PublicationThe search for solar oscillations, 1974 to 1976
Using a resonant scattering spectrometer, observations of integral solar light have been recorded and analyzed to determine the existence of solar oscillations...