Coronal disturbances : symposium no. 57 held at Surfers Paradise, Queensland, Australia, 7-11 September, 1973

This Symposium was held at Surfer's Paradise, Queensland, Australia, from 7 to 11 September 1973. The Organizing Committee, chaired by J. P. Wild, consisted of A. Boischot, A. Bruzek, J. T. Jefferies, G. Newkirk, T. Takakura, and V. V. Zhelez­ nyakov. We are indebted to the Local Organizing Commettee, chaired by S. F. Smerd and including R. G. Giovanelli, R. E. Loughhead, N. G. Seddon, K. V. Sheridan, and J. P. Wild, for advice in preparing this volume as well as for the smooth arrangement of the sessions. In addition, the session chairmen and reporters are to be thanked for their assistance in preparing the recorded discussions. It is a pleasure to thank Mrs R. Toevs and Mr A. Csoeke-Poeckh of High Altitude Observatory for assistance in editing these Proceedings. The financial aid for the Symposium afforded by the International Astronomical Union, the Ian Potter Foundation of Melbourne, and the Sunshine Foundation of Melboume, as well as generous assistance of the CSIRO Divisions of Physics and Radiophysics is gratefully acknowledged. That the solar corona is not a quiescent plasma was first fully appreciated through the discovery of solar radio bursts thirty years ago. Since that time intensive re­ search has uncovered a vast variety of coronal disturbances and revised our con­ cept of this region of the solar atmosphere to that of a dynamic medium undergoing continuous expansion, constantly evolving under the influence of underlying photo­ spheric activity, and frequently traversed by transient phenomena. Front Matter....Pages I-XVIII Front Matter....Pages 1-1 Magnetic Structure Responsible for Coronal Disturbances: Observations....Pages 3-33 Magnetic Structure Responsible for Coronal Disturbances: Theory....Pages 35-68 Inversion Lines of Photospheric Magnetic Fields and Solar Corona....Pages 69-72 Large-Scale Magnetic Structures Responsible for Coronal Disturbances....Pages 73-83 Distribution of Circularly Polarized Emission across the Solar Disk at λ =4.3cm....Pages 85-87 Boundary Fitting Problems Associated with Coronal Magnetic Models....Pages 89-91 Analysis of EUV Observations of a Coronal Active Region Made during the 7 March 1970 Eclipse....Pages 93-95 Coronal Magnetic Field Structure Derived from Two-Frequency Radioheliograph Observations....Pages 97-101 Front Matter....Pages 103-103 Impulsive (Flash) Phase of Solar Flares: Hard X-Ray, Microwave, EUV and Optical Observations....Pages 105-141 Spectral Association of the 7 August 1972 Solar Radio Burst with Particle Acceleration....Pages 143-146 X-Ray Emission in Absence of Flares Related to Hα Activity and Type III Burst Production....Pages 147-148 Coronal Disturbances Observed in the Optical Emmission Lines....Pages 149-154 Forbidden Line Excitation Data for Certain Coronal Lines....Pages 155-155 Multiple Hard X-Ray Bursts and Associated Emissions....Pages 157-159 Ground-Based Observations of Type III Bursts....Pages 161-181 Solar Radio Bursts at Low Frequencies....Pages 183-200 The Flash Phase of Solar Flares: Satellite Observations of Electrons....Pages 201-223 High Resolution Studies of Type III Solar Radio Bursts....Pages 225-226 Coronal Density Structures in Regions of Type III Activity....Pages 227-230 Meter and Decameter Wavelength Positions of Solar Radio Bursts of July 31–August 7, 1972....Pages 231-233 Front Matter....Pages 103-103 Source Structure in Metre-Wave Type V Solar Bursts....Pages 235-238 Direct Measurements of the Directivity of Type I and Type III Radiation at 169 MHz....Pages 239-242 Paired Type III Bursts....Pages 243-244 Unusual Absorption of a Solar Type II Burst by ‘Shadow’ Type III Bursts....Pages 245-248 High Resolution Observations of Generalized Fast Drift Bursts....Pages 249-251 Mechanisms for Flash Phase Phenomena in Solar Flares....Pages 253-282 A Theory of Type III Solar Radio Bursts....Pages 283-283 A Relationship between the Brightness Temperatures for Type III Bursts....Pages 285-287 The Third Harmonic in Solar Radio Bursts....Pages 289-290 Fine Structure in Type IV Solar Radio Bursts....Pages 291-292 A Theory of Type I Solar Radio Bursts....Pages 293-294 Synchrotron Radiation in Directions Close to Magnetic-Field Lines....Pages 295-297 Front Matter....Pages 299-299 Shock Waves and the Ejection of Matter from the Sun: Radio Evidence....Pages 301-321 Optical Evidence for Plasma Ejections and Waves in the Solar Corona....Pages 323-332 The Behaviour of the Outer Solar Corona (3 R ⊙ to 10 R ⊙ ) during a Large Solar Flare Observed from OSO-7 in White Light....Pages 333-334 The Coronal Disturbance of 12 August 1972....Pages 335-336 Observation of a Coronal Disturbance from 1 to 9 R ⊙ ....Pages 337-341 Type II Solar Radio Bursts in the Decimeter Band....Pages 343-343 Observations of Split-Band Harmonic Type II Bursts with the Culgoora Radioheliograph at 80 and 160 MHz....Pages 345-348 Type II Bursts at Hectometric and Kilometric Wavelengths from Interplanetary Shocks....Pages 349-353 Front Matter....Pages 299-299 East-West Asymmetry of Magnetic Bottle Expansion and its Relation to Shock Waves Propagating in the Solar Atmosphere....Pages 355-359 Shock Waves and Plasma Ejection: Corpuscular and Interplanetary Evidence....Pages 361-363 Theory of Shock Waves and Plasma Wave-Emission....Pages 365-375 Interplanetary Shock Waves from McMath Region 11976 during its Passage in August 1972....Pages 377-381 Type II Burst-Sources as Low- V A Regions in the Corona ‘Illuminated’ by Flare-Induced MHD Shocks....Pages 383-385 On the Theory of Moving Type IV Radio Bursts....Pages 387-387 On Split-Band Structure in Type II Radio Bursts from the Sun....Pages 389-393 On the Thermal Interpretation of Hard X-Ray Bursts from Solar Flares....Pages 395-412 Front Matter....Pages 413-413 The Charge and Isotopic Composition of Solar Cosmic Rays....Pages 415-420 X-Ray Evidence for the Acceleration, Containment, and Emission of High Energy Flare Particles....Pages 421-422 Acceleration, Containment and Emission of High Energy Flare Particles: Radio Evidence....Pages 423-435 Particle Acceleration in Solar Flares....Pages 437-445 Millimeter Radio Evidence for Containment Mechanisms in Solar Flares....Pages 447-460 Acceleration, Containment, and Emission of Very Low Energy Solar Flare Particles....Pages 461-469 Solar Radio Pulsations....Pages 471-471 Coronal Magnetic Fields and Energetic Particles....Pages 473-476 Coherent Effect in the Preferential Acceleration of Relativistic Solar Heavy Cosmic Ray Nuclei....Pages 477-478 A Conductive Cooling Model for Confined Solar Flare Plasma....Pages 479-479 The Gyro-Synchrotron Radiation from Moving Type IV Sources in the Solar Corona....Pages 481-482 Front Matter....Pages 483-483 Temporal Observations of the λ 5303 Emission Line Profile during the 74 Minute Totality from the Concorde SST at the 30 June 1973 Total Solar Eclipse: Preliminary Intensity Variations Above an Active Region....Pages 485-487 Front Matter....Pages 483-483 Skylab: A Progress Report....Pages 489-490 Preliminary Results from the NRL/ATM Instruments from Skylab SL/2....Pages 491-495 Solar EUV Photoelectric Observations from Skylab....Pages 497-500 Dynamic Events in the X-Ray Corona....Pages 501-504 The High Altitude Observatory White Light Coronagraph Experiment....Pages 505-506 Back Matter....Pages 507-508