High Resolution in Solar Physics: Proceedings of a Specialized Session of the Eighth IAU European Regional Astronomy Meeting Toulouse, September 17–21, 1984 (Lecture Notes in Physics, 233)

Observatoires du Pic du Midi et de Toulouse I would like to say, first, how grateful I am to the colleagues who decided to have this Colloquium devoted to high-angular-resolution in solar physics, and particularly to my old friend Dick Dunn who accepted to travel eight thousand kilometers and back to summarize here what I have done in that field, where he is a prominent connoisseur. Needless to say, I deeply appreciated his recommendations for testing solar pictures : "You could compare your results to those from space when available; alternatively, compare your pictures to those from Pic-du-Midi.; and I am happy, too, to learn that until 15 years ago, Zirin and himself were called "dermatologists"; it did not happen to me, contrary to what he suspects, but that was for the simple reason that people, in France, did use, instead, the more trivial words "post-dard maker". And I remember that almost thirty years ago, more than one famous theorist positively denied the existence of some of the sharp features recently detected at the Pic, because they contradicted the theory ! So, may I risk a question : if things have changed, is it because the theorists refined their theories and needed sharper observations to support them, or because the bulk of high resolution pictures in the market forced them to refine their theories ? I shall come back to such matters soon. At the moment, I would simply express my strong support to Dick Dunn when he says that so much is still to be expected from high resolution observations -except that he may be slightly too optimistic when relying upon my activity for the thirty years to come ... Professor Rösch, Pic du Midi and high resolution....Pages 1-7 Acknowledgements and comments....Pages 8-12 The large European solar telescope....Pages 13-31 The European observatory at the Canary Islands....Pages 32-50 High resolution solar observations....Pages 51-61 Adaptive image stabilization of solar observations: A review....Pages 62-82 Collages of granulation pictures....Pages 83-90 Simulated correlation tracking on solar granulation....Pages 91-95 High resolution speckle imaging of solar small-scale structure: The influence of anisoplanatism....Pages 96-102 Speckle interferometry technique applied to the study of granular velocities....Pages 103-107 The interest of simultaneous spectral and spatial high resolution spectroscopy in the infrared....Pages 108-112 Preliminary results obtained with a new experimental apparatus for solar spectropolarimetry....Pages 113-117 Solar two-dimensional spectroscopy with universal birefringent filters and fabry-perot interferometeRS....Pages 118-122 Solar high resolution balloon spectra obtained in the 190–300 nm wavelength band....Pages 123-127 Hundredths of arcsec resolutions with new optical correctors on deep u.v. photoresist....Pages 128-132 Observations of the birth and fine structure of sunspot penumbrae....Pages 133-137 The high resolution structure of the sun....Pages 139-163 Fine structure and evolution of solar granulation....Pages 164-168 Temperature gradients in the solar granulation....Pages 169-171 Line profiles and longitudinal velocity field in seeing limited small-scale atmospheric structures....Pages 172-177 Determination of magnetic fields in unresolved features....Pages 178-197 Evershed effect and magnetic field in penumbral finestructures....Pages 198-202 Bright points in Ha wings and connected mass flows in the solar chromosphere....Pages 203-207 Quantitative filtergram imagery of the solar acoustic oscillations....Pages 208-213 Theoretical interpretation of small-scale solar features....Pages 215-225 Relevance of magnetic flux expulsion from the lower solar atmosphere to the acceleration of the solar wind....Pages 226-230 Magnetic and velocity field analysis of a quiet region near the center of the sun....Pages 231-235 A possible mechanism for solar photosphere bright point formation....Pages 236-241 The structure of the solar granulation....Pages 242-248 A model for the run of the horizontal and vertical velocities in the deep photosphere....Pages 249-253 Influence of umbral dots on sunspot models....Pages 254-258 Some results of photospheric fine structure investigations at the Pulkovo observatory....Pages 259-260 Atmospheric fine structure as a probe for the solar interior....Pages 261-276 Variability of the quiet photospheric network....Pages 277-281 Search for giant convective cells from the analysis of meudon spectroheliograms....Pages 282-288 The variability of photospheric granulation and total radio flux of quiet sun in the centimetric waveband during a solar cycle....Pages 289-293 Dynamic phenomena in the chromospheric umbra and penumbra of a sunspot....Pages 294-298 Photometry of light-bridges in sunspots....Pages 299-303 Observations of Ellerman bombs in Hα....Pages 304-309 Summary....Pages 313-317