Chromospheric fine structure : symposium no. 56 held at Surfer's Paradise, Qld., Australia, 3-7 September 1973

The devotion of an IA U symposium entirely to the topic of chromo spheric fine structure at a time when models of the spherically symmetric chromosphere are still evolving constitutes a valid recognition of the growing feeling among solar astron­ omers that the chromosphere cannot be understood independently of its discrete structural features. Network structure, which seemingly borders the photospheric supergranule cells, persists intact throughout the chromosphere and most of the chromosphere-corona transition region. The network is the locus of the bright coarse mottles, and the spicule bushes and is the terminus for one end of the quiet chromo­ spheric fibrils as well. Additionally, it is the locus of most of the magnetic flux of the quiet chromosphere. It is not surprising, therefore, that current studies of the chromosphere tend to center around efforts to better describe the network phenom­ ena and to ascertain the physical properties of the network features. Clearly, the supergranule cells and associated network structures constitute a fundamental and singularly important feature of solar structure in the boundary layers. Just as it is now clear that much of the chromo spheric fine structure is associated with the network bordering supergranule cells, it seems equally clear that structural features are almost universally associated with both fluid flow and magnetic geometry. Indeed, many observers claim that the brightness features faithfully map the mag­ netic lines offorce while still others claim that associated with each class of brightness feature there is a more or less unique fluid flow. Front Matter....Pages VI-VII Front Matter....Pages 1-1 Spicules and Their Surroundings....Pages 3-21 Radiation Pressure in Stellar Atmospheres with Application to Solar Spicules....Pages 23-24 Chromospheric Fine Structures near the Solar Limb in H α ....Pages 25-25 Recent Developments in Improving Daytime Angular Resolution from the Ground....Pages 27-30 Spatial and Spectral Structure of Chromospheric Lines....Pages 31-32 Front Matter....Pages 33-33 Why the Chromosphere has Its Discrete Fine Structure....Pages 35-44 Properties of the Solar Filigree Structure....Pages 45-47 Spicules are Bright and Dark....Pages 49-50 High Resolution Spectroscopy of the Disk Chromosphere....Pages 51-53 Comparison of H α and Ca ii H and K Spectro-heliograms as a Diagnostic Probe....Pages 55-63 Fine Structure of the Sun at Centimeter Wavelengths....Pages 65-68 Front Matter....Pages 69-69 Fine Structure of the Upper Chromosphere....Pages 71-88 Further Observations of the Structure of the Chromosphere-Corona Transition Region from Limb and Disk Intensities....Pages 89-90 Non-Static Structure of the Chromosphere-Corona Transition Region....Pages 91-91 On the Design of Chromospheric Models....Pages 93-93 Front Matter....Pages 95-95 Motions of Chromospheric Fine Structures....Pages 97-135 Waves and Oscillations in the Chromosphere in Active and Quiet Regions....Pages 137-151 Chromospheric Oscillations in Plages....Pages 153-156 Trapped Oscillations in the Chromosphere in the Presence of a Magnetic Field....Pages 157-158 Front Matter....Pages 159-159 The Magnetic Structure of Plages....Pages 161-175 Front Matter....Pages 159-159 On Facular Models....Pages 177-178 A Facula Model and Its Application to Facula Fine Structures....Pages 179-181 The Relation between Chromospheric and Photospheric Structures in Sunspot Groups....Pages 183-191 The Structure of the Prominence-Corona Interface....Pages 193-196 Helical Field Lines in an Erupting Filament....Pages 197-198 Front Matter....Pages 199-199 Streaming Magnetic Features near Sunspots....Pages 201-231 On the Relation between Moving Magnetic Features and the Decay Rates of Sunspots....Pages 233-234 A Theoretical Model for the Convection of Magnetic Flux in and near Sunspots....Pages 235-237 Evolution of Chromospheric Fine Structures on the Disk....Pages 239-255 Evolution of Structures in the Bright H α Network....Pages 257-261 H α Fine Structure and the Dynamics of the Solar Atmosphere....Pages 263-266 Front Matter....Pages 267-267 The Chromospheric Energy Balance....Pages 269-291 Ray Trapping in Stellar Envelopes, Pulsational Instabilities and Heating of External Layers....Pages 293-293 A Magnetic Model of the Chromosphere-Corona Transition Region....Pages 295-298 Excess Heating of Corona and Chromosphere above Magnetic Regions by Non-Linear Alfvén Waves....Pages 299-299 The Stability of a Magnetic Flux Rope and Its Relation to Sunspots, Faculae and Flares....Pages 301-301 Back Matter....Pages 303-310 Proceedings of IAU Symposium No. 56, held at Surfer's Paradise, Queensland, Australia, September 3-7, 1973