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From 17 to 21 April 1967 a Study Week was held in the hotel 'De Bilderberg' near Arnhem, Holland, with the purpose to establish a new, and if possible, generally acceptable working model for the quiet parts of the solar photosphere and low chromosphere. The organizers of the conference hoped that even if this latter goal appeared too far to be reached, such a meeting would still be useful, if only for enumerating the crucial problems in solar photospheric research, and for defining future subjects of research. About twenty solar physicists from outside the Netherlands participated in the Study Week, while some others, though prevented from actively attending, sub mitted their comments before the meeting. The two above-mentioned goals were reached: a working model could be estab lished; yet it became clear that not everyone would agree about this model, and it became obvious too that future research is strongly needed, in particular in the field of line formation (coherence, or non-coherence; local thermal equilibrium), while also the motion field of the photosphere and chromosphere is insufficiently known, and its influence on the formation of spectral lines hardly understood.
List of contents
The Bilderberg Model of the Photosphere and Low Chromosphere.- Spectrum Measurements of the Sun near 1 cm Wavelength.- Observations of the Center-to-Limb Variation of the Solar Brightness in the Far Infrared (10 to 25 Microns).- Observational Studies of the Solar Intensity Profile in the Far Infrared and Millimeter Regions.- The High-Dispersion Continuous Ultraviolet Solar Spectrum and the Balmer-Jump.- Effects of Line Blanketing on the Solar Windows.- Limb-Darkening Observations between 1800 and 2900 Å.- The Far Ultraviolet Spectrum of the Sun.- The Solar Continuum from 900 to 130 000 Å and the Photospheric Temperature Model.- Comments on the Bilderberg Continuum Atmosphere.- A Simplified Model Solar Atmosphere.- Center-to-Limb Analysis of the Solar Oxygen Lines.- The Center-Limb Behavior of Solar Molecular Lines.- Source Functions in the Cores of Infrared Fraunhofer Lines.- The Solar H and K Lines of Ionized Calcium.- Emission Cores in H and K Lines. I: The Optically Thick Chromosphere.- Contribution à l'étude du spectre solaire de l'hydrogène.
