Sun and Planetary System: Proceedings of the Sixth European Regional Meeting in Astronomy, Held in Dubrovnik, Yugoslavia, 19-23 October 1981

The Sixth European Regional Meeting in Astronomy (VI ERMA) on "Sun and Planetary System" was held in Dubrovnik (Yugoslavia), 19-23 October 1981, sponsored by the Federal Executive Council of Yugoslavia, the IAU, IUGG, and the European Physical Society. The Scientific Organizing Committee included W. Fricke (Chairman), H. Alfven, H. Haupt, H. Kautzleben, Z. Kopal, J. Kovalevsky, V. A. Krat, L. Kresak, G. Marx, P. Melchior, P. J. Message, J. -C. Pecker, G. Sitarski, B. Sevarlic, G. Teleki, and R. M. West. The Local Organizing Committee representing the Union of Societies of Mathematicians, Physicists and Astronomers, Yugoslavia, included G. Teleki (Chairman), I. Pakvor (Vice-Chairman), Z. Knezevic (Secretary), B. Jovanovic, L. Randic, P. Ranzinger, V. Ruzdjak, B. Popovic, and B. Sevarlic. The Meeting was attended by 216 participants from 27 countries (5 continents). The scientific programme was divided into the following five sections: (1) Sun from the astronomical and physical points of view (main organizer: J. -C. Pecker); (2) Astronomical, geophysical and geodetic problems related to the Earth (main organizer: J. Kovalevsky); (3) Physics of planets, minor planets, satellites and interplanetary medium (main organizer: Z. Kopal); (4) Motions in the planetary system (main organizer: L. Kresak); (5) Three­ dimensional refraction (main organizer: G. Teleki). Ten invited review papers were presented in 5 plenary sessions; 20 invited papers and about 100 contributed papers were presented in parallel sessions.

Address by.- Opening Address by.- Address by.- New Impetus to the Exploration of the Solar System (Inaugural Address).- The Solar System — Known Facts and Unsolved Problems (Opening Invited Lecture).- Section I — Sun from the Astronomical and Physical Points of View.- The Star “Sun” (Invited Review Paper).- Resultats d’Observations du Soleil a l’Astrolabe du CERGA.- The Effect of Personal Equation on Measurements of the Solar Semi-diameter by Transit Circle Observers.- A Direct UBV Color Measurement of the Sun.- Nuclear Astrophysics of the Sun (Invited Paper).- The Solar Neutrino Puzzle (Invited Paper).- Solar Models and Neutrino Problem.- The Rotation-Magnetism-Convection Coupling in the Sun (Invited Review Paper).- Relationship between Photospheric and Chromospheric ?(?,t) deduced by Temporarily and Spatially Correlated Tracers.- Line-of-sight Velocity Field of Synodic Solar Rotation.- Solar Rotation and Meridional Motions Derived from Sunspot Groups.- Subphotospheric Velocity Fields Inferred by Sunspots Motions.- Granulation, Supergranulation and Atmospheric Waves (Invited Review Paper).- A Noisy Sun?.- Spectral Analysis of Wave Motions in the Region of Temperature Minimum of the Sun’s Atmosphere.- On the Detection of the Periodic Oscillations of the Inclination of the Frequency Spectrum of S-Component of Solar Radio Emission.- Some Photospheric Characteristics of the Sun as a Star.- Stark Broadening of Heavy Ion Solar Lines.- The Analysis and Observation of the Neutral Spectrum of Potassium in the Solar Atmosphere.- Mesoturbulence in the Solar Atmosphere.- Voigt Profile for the CO Emission Lines in the Solar Sunspot Spectrum.- Solar Radio Granulation at Microwaves and its Optical Identification.- A Theoretical Model of the Solar Chromosphere over a sunspot.- Space-born and Ground-based Observations of a Solar Active Region and a Flare.- The Beginning of Observations of Large-scale Solar Magnetic Fields at the Sayan Observatory: Instrument, Plans, Preliminary Results.- The Solar Complex of SibIZMIR: Observatories, Instruments and the Main Results of the Investigations.- Motions in Sunspots Like Torsional Oscillations.- Sunspots Proper Motions and Positions of H-Alpha Filaments in the Active Region of August 1979.- On the Umbral Dots.- Turbulent Velocity Fields in Quiescent Prominences.- Determination of the Electron Density in a Quiescent Prominence.- A Polarization Investigation of Prominences.- The Formation of Solar Prominences.- Radiation from Surface Wave Packet and Type II Solar Radiation Emission.- Magnetohydrodynamics and Thermodynamics of Coronal Loops.- Temperature and Steady Flows in Slender Magnetic Tubes.- Gravito-magnetic Explanation of the Temperature of Stellar Coronae and of Planetary van Allen Belts.- Section II — Astronomical, Geophysical and Geodetic Problems Related to the Earth.- Astronomical and Geophysical Problems of the Earth’s Rotation (Invited Review Paper).- A Note on the Initial Results and Future Plans of Project MERIT (Invited Review Paper).- Steps towards the Determination of Earth Rotation Parameters not Dependent on the Observation Technique (Invited Paper).- Secular and Decade Fluctuations in the Earth’s Rotation: 700 BC — AD 1978 (Invited Paper).- Oceanic Tides and the Rotation of the Earth (Invited Paper).- Effects of the Non-Rigidity of the Earth Derived from Astronomical Observations.- Correlation between Solar Activity and Universal Time Variations.- On Investigations of Mean Latitude Variations.- Closing Errors of the Belgrade Latitude Observations and Temperature Influences.- Reference Systems Linkage from Space.- High Precision Tracking of Geosynchronous Satellites: Oceanographic Applications.- Optical Tracking of Synchronous Satellites for Geophysical Purposes.- Gravimetric Geoid Determination for the Area of Greece.- Coincidence of Some Magnetic and Gravity Field Characteristics.- Precession and Nutation Influence on the Harmonic Coefficients of a Planetary Potential.- Aerosol Stratification of the Stratosphere and Mesosphere.- Interplanetary Magnetic Field and Solar Cycle Modulation of the Tropospheric Circulation over West Mediterranean.- On the Evolution of Nearly Circular Orbits of Satellites with Critical Inclination.- Section III — Physics of Planets, Minor Planets, Satellites and Interplanetary Medium.- Excitation in the Early Solar Nebula — New Experimental Findings (Invited Paper).- Physical Processes of Relevance to the Formation of the Planetary System (Invited Review Paper).- Magnetospheres of Jupiter and Saturn (Invited Paper).- A Physical Detail Relevant to the Savi?-Kašanin Theory of Behaviour of Materials under High Pressure.- On the Lifetime of E-ring Grains and their Nature.- H2 Enrichment of Interplanetary Medium.- Study of the Interplanetary Dust at High Ecliptic Latitudes: Doppler-Fizeau Shifts.- Near Infrared Emission from the Solar Corona.- Associative Ionization and Sodium in the Atmospheres of Planetary System Bodies.- On Physical Interpretation of Hypsometric Characteristics of the Moon and Planets.- The Lunar Photometric Constant in the System of True Full Moon.- Surface Properties of Asteroids (Invited Paper).- Earth-Crossing Asteroids: New Discoveries (Invited Paper).- Synthetic Lightcurves of Asteroidal Binary Systems.- CCD Scanning for Asteroids and Comets (Invited Paper).- Color Variations of Asteroids During Rotation.- Results from Occultations by Minor Planets.- On the Rotation of M Asteroids.- Asteroid Rotation Rates: Comparison Between Theory and Observations.- Asteroid Collisional Evolution: Outcomes of Catastrophic Impacts.- An Improved Representation of the Average Opposition Magnitudes of Asteroids.- A Coordinate Program for Pole Determination of Asteroids.- The Worldwide Photoelectric Campaign for the Asteroid 51 Nemausa.- Halley’s Comets and Plans for its Observation During its Return in 1986 (Invited Paper).- Perihelion Asymmetry in the Photometric Parameters of Long-period Comets at Large Heliocentric Distances.- Ultraviolet Spectroscopy of Comets.- Plasma-Dust Interactions in the Solar and Cometary Environment.- The Total Mass and Structure of the Meteor Stream Associated with Comet Halley.- Outbursts of Comets.- On the Electric Charge of Interplanetary Grains.- Observations of Zodiacal Light at AbuSimbel, Egypt, During the Period 1975–1979.- The Brightness Integral Equation. A Different Approach to the Study of the Zodiacal Light.- Sarajevo Observatory Fireball Patrol.- Section IV — Motions in the Planetary System.- Review of the Dynamics of Satellites and Planetary Rings (Invited Review Paper).- Dynamical Evolution and Disintegration of Comets (Invited Review Paper).- A Dynamical Study of Possible Birthplaces of Comets.- An Interstellar Origin for Comets.- Strong Perturbations at Close Encounters with Jupiter (Invited Paper).- Statistics of Close Encounters of Minor Bodies with the Outer Planets.- Keplerian Estimates of Pre-discovery Encounters with Jupiter for Short-Period Comets.- The Motions of Comets near the 2/1 Resonance with Jupiter.- Temporary Satellite Captures by Jupiter for Orbits Resembling the One of Comet P/Gehrels 3.- On the Long-term Orbital Evolution of Comet P/Boethin.- On the Displacement of Meteor Showers Activity.- Some Characteristics of the Asteroid Belt Structure.- Resonances in the Motions of Minor Planets and their Use for the Determination of Masses (Invited Paper).- Stability of Real Hecuba and Hilda Asteroids.- First-order Theory of Ceres, Pallas, Juno and Vesta.- Methods of Computation of the Perturbed Motion of Small Bodies in the Solar System (Invited Paper).- A New Method for Expression of the Perturbation Function.- Relativistic Dynamics of the Earth-Moon System.- On the Secular Effects in the Motion of a Planetary Satellite.- L’Invariabilité Séculaire des Grands Demiaxes des Orbites Planétaires.- On Linear Stability of Triangular Libration Points of the Photogravitational Restricted Three-Body Problem when the More Massive Primary is an Oblate Spheroid.- Nouvelles Theories des Planetes et de la Lune dans les Ephemerides Francaises.- New Planetary Ephemerides back to 4000 B.C..- Ephemerides et Observations de Mars a l’Astrolabe.- Observations of the Sun and Inner Planets with the Large Meridian Circle in Belgrade.- Some Results of the Mercury Transit Observations in 1970 and 1973 at Belgrade.- Contribution of the Pulkovo Observatory to the Improvement of Orientation of the FK4 System Using Observations of Selected Minor Planets.- Section V — Three-Dimensional Refraction.- Problems of Three-dimensional Refraction in Astrpmetry (Invited Paper).- The Use of Lidar to Obtain Three-dimensional Refraction Data (Invited Paper).- Final Refraction Problems in Time and Latitude Observations through Classical Techniques (Invited Paper).- Astronomical Refraction Calculated from Aerological Data in Japan.- Experimental Model for Diurnal Astronomical Refraction.- Astrometric Site Selection (Invited Review Paper).- The Influence of Ionospheric Refraction on Radio Astronomy Interferometry.- Disregard of Some Ray Tracing Principles in Optical and Radio Spectral Bands.- Refraction Effects on Geodetic Measurements in Three-dimensional Terrestrial Nets (Invited Paper).- Experimental Investigation of Refraction above Water Crossings.- Atmospheric Turbulence and its Effects on Direction Measurements (Invited Review Paper).- Local Geodynamics with Two-colour Instruments (Invited Paper).- Terrestrial Refraction and Vertical Temperature Gradient (Invited Paper).- Terrestrial Refraction and Vertical Temperature Gradient in the Area of Thessaloniki.- A Study of the Refractivity N of the Air in the Area of Athens.- List of Participants.