The contrast of the photospheric granulation in the centre of the disk at a wavelength of 500 nm has been determined by means of photographs taken during the...
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PublicationA new determination of the solar granulation contrast
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NewsChile and Argentina feature in the next solar eclipse
On July 2nd there will be a total eclipse of the sun which will touch land only in Chile, Argentina, and on the island of Oeno a small corral atol in the centre...
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PublicationOn the width distribution of penumbral filaments in sunspots
The width distribution of the penumbral filaments is estimated using white light photographs obtained with a vacuum, Newtonian type telescope. Observations were...
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PublicationSubmillimeter brightness spike at the solar limb
Submillimeter observations made with a rapid-scanning interferometer during the solar eclipse of June 30, 1973 are reported. Reduction, correction, and plotting...
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PublicationThe Canary Islands' astrophysical observatories - A European community project
The development of astrophysical observatories in the Canary Islands by the European community is discussed. Consideration is given to principal astronomical...
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PublicationUmbral dots - A case of penetrative convection between sunspot fragments
A study of the observations made on the development and, in some cases, even the decay of 15 large active regions is presented. It is shown that the mature...