Mechanisms of Chromospheric and Coronal Heating: Proceedings of the International Conference, Heidelberg, 5–8 June 1990

Front Matter....Pages I-XV
Introduction....Pages 1-3
Front Matter....Pages 5-5
Observations of Waves and Oscillations....Pages 6-18
Observations of Waves and Oscillations in Solar Magnetic Fluxtube Concentrations....Pages 19-21
The Generation of Long Period Acoustic Waves by Solar Global Oscillations....Pages 22-24
Measurements of 1-Hz Coronal Oscillations at Total Eclipses and Their Implications for Coronal Heating....Pages 25-29
Short-Term Oscillations in Green and Red Coronal Lines....Pages 30-32
Height-Dependent Short-Period Oscillations in the Fe XIV (530.3 nm) Solar Corona Above a Sunspot Group Crossing the Limb....Pages 33-35
On the Dynamics of Granulation in Active Regions and the Heating Problem....Pages 36-38
Generation of Electric Currents and Waves on Magnetic Flux Tubes by Horizontal Velocities in the Photosphere....Pages 39-41
On the Magnetic Field Activity in Solar Active Regions....Pages 42-43
The Bright Points in the Ca II K-Line and Their Relation to the Inner Network Magnetic Structures....Pages 44-47
K 2V Cell Grains and Chromospheric Heating....Pages 48-53
Wave Heating in Chromospheric Bright Points....Pages 54-59
Do We Really Know What the Actual Chromospheric Heating Requirements Are?....Pages 60-62
The Effects of Electron Scattering on the Si II 1816 Line in the Solar Chromosphere....Pages 63-65
SIMURIS: a High Resolution Solar Physics Interferometric Mission in Answer to the Chromospheric and Coronal Heating Problem....Pages 66-72
The Solar Ultraviolet Network (SUN)....Pages 73-76
HRTS Time Series Observations: Chromospheric and Coronal Heating....Pages 77-82
High Spatial Resolution Observations of the Solar Transition Region: Spicules and Microflares....Pages 83-96
New Models of the Chromosphere and Transition Region....Pages 97-99
Front Matter....Pages 5-5
The Role of Particle Diffusion in the Lower Transition Region: Revised Interpretation of Emission Measures....Pages 100-102
Why Heating is Not Necessary in the Transition Region or Upper Chromosphere....Pages 103-108
Height-Dependent Solar Plage Temperature Distribution....Pages 109-112
On the Temperature Inhomogeneity of the Lower Solar Corona....Pages 113-114
Very High Resolution Solar X-ray Imaging....Pages 115-123
Spectra of MHD Turbulence in Coronal Active Regions....Pages 124-126
Observations of Coronal Bright Points and Implications for Coronal Heating Mechanisms....Pages 127-131
Modelling Coronal Active Region Emission Patterns....Pages 132-134
The Fe Ionization Equilibrium in the Solar Corona With a Non-Maxwellian Distribution Function....Pages 135-136
Energetics of Solar Coronal Holes....Pages 137-139
Coronal Radio Emission....Pages 140-149
Implications of Microwaves for Heating and Particle Acceleration on the Sun....Pages 150-151
Properties of Impulsive Events in a Polar Coronal Hole....Pages 152-158
Explosive Instability in Solar Coronal Loops....Pages 159-161
Signatures of Coronal Structures and Turbulence in the Solar Wind....Pages 162-164
Front Matter....Pages 165-165
What Can Solar and Stellar Ultraviolet Observations Tell About Chromospheric and Coronal Heating Mechanisms?....Pages 166-178
He I 5876Å Line As an Indicator of Chromospheric Heating in Young F-Type MS Stars....Pages 179-181
Chromospheric Modelling of Active Regions on AU Mic....Pages 182-184
New Clues to Atmospheric Heating Processes in Luminous Cool Stars....Pages 185-199
Chromospheres of Cool Non-Mira Giant Stars....Pages 200-205
Front Matter....Pages 165-165
What Can Observations of Giants and Supergiant Stars Tell Us About Chromospheric and Coronal Heating?....Pages 206-221
Chromospheric Activity in Late-Type Giants and Supergiants: Constraints on Heating Theories....Pages 222-224
Coronal Heating and the Dividing Line....Pages 225-227
An Infrared Perspective on Chromospheres....Pages 228-240
Magnetic Activity Across the Hertzsprung-Russell Diagram....Pages 241-256
Relations Between Activity and Magnetic Fields....Pages 257-272
Recent Measurements of Stellar Magnetic Fields....Pages 273-278
Chromospheric/Coronal Emission Correlations in ‘Quiescent’ and Eruptive Phenomena in M-Dwarf Stars....Pages 279-281
Global Electrodynamic Coupling in Stellar Atmospheres....Pages 282-286
Implications for Coronal Heating Theories from Stellar X-ray Observations....Pages 287-299
Empirical Constraints on Coronal Heating Processes....Pages 300-315
Minimum Coronal Energy Requirements: Constraints for Heating Mechanisms....Pages 316-318
Sun-Hot Star Contrast in Chromospheric/Coronal Te(r). Nonradiative Heating vs. Outflow Enhanced Opacity....Pages 319-323
Formation of Chromospheres and Coronae of Accretion Disks by Viscous Dissipation....Pages 324-326
Front Matter....Pages 327-327
Acoustic Heating....Pages 328-343
On the Intrinsic Difficulty of Producing Stellar Coronae with Acoustic Waves....Pages 344-346
The Effect of Waves on Optically Thin Transition Region Lines....Pages 347-349
Heating of the Solar Atmosphere by Spicules....Pages 350-352
Nonlinear Pulse Propagation in a Stratified Atmosphere....Pages 353-355
The Shock Wave Heating Mechanism of Pulsating Star Chromospheres....Pages 356-358
Front Matter....Pages 327-327
Ionization Pumping....Pages 359-365
Shock Amplification by Radiation....Pages 366-368
Recent Developments in Theories of Wave Generation....Pages 369-379
Generation of Acoustic Flux Derived from Numerical Simulations of the Solar Granular Convection....Pages 380-385
Magnetoacoustic Waves and Their Generation by Convection....Pages 386-401
Magnetoacoustic Heating of the Solar Chromosphere....Pages 402-404
Effects of Line-Tying and Non-Uniformities on Thermal Instabilities and Slow MHD Modes....Pages 405-407
Heating in Intense Flux Tubes....Pages 408-413
Line Simulation of Solar Structures Permeated by Acoustic and MHD-Waves....Pages 414-416
Damping of Shocks in Magnetic Flux Tubes....Pages 417-418
Heating of the Solar Chromosphere by MHD-Waves....Pages 420-422
Alfvén Waves....Pages 423-434
Reflection of Alfvén Waves and Heating in Solar Coronal Holes....Pages 435-437
Alfvén Wave Propagation in a Solar Magnetic Structure....Pages 438-441
On Propagation and Absorption of Alfvén Waves in Coronal Loops....Pages 442-444
Magnetic Confinement, Alfvén Wave Reflection, and the Origin of X-ray and Mass Loss “Dividing Lines”....Pages 445-447
Heating in Stochastic Magnetic Fields....Pages 448-463
Resonance Absorption Heating....Pages 464-479
Resonant Absorption of MHD Waves in Magnetic Loops in the Solar Corona....Pages 480-485
On the Time Scales and the Efficiency of Solar Coronal Loop Heating by Resonant Absorption....Pages 486-488
Front Matter....Pages 327-327
Line-Tying Effects on Stability and Heating of Solar Coronal Loops....Pages 489-491
Coronal Loop Heating by Discrete Alfvén Waves....Pages 492-493
Magnetohydrodynamic Surface Waves....Pages 494-507
Magnetoacoustic-Gravity Surface Waves....Pages 508-510
Properties of Non-Parallel Magnetoacoustic Surface Waves....Pages 511-513
Viscous Damping of Magnetohydrodynamic Surface Waves....Pages 514-516
Coronal Loop Heating by the Fast Surface Wave....Pages 517-518
Front Matter....Pages 519-519
The Formation of Current Sheets and Coronal Heating....Pages 520-535
Current Sheet Formation in Force-Free Magnetic Fields....Pages 536-538
Two-Dimensional Magnetic Neutral Points....Pages 539-540
The Significance of Magnetic Null Points....Pages 541-543
Effect of Coronal Heating on Coronal Arcades....Pages 544-546
Heating by Field Aligned DC Joule Dissipation....Pages 547-561
Joule Heating in the Sun’s Lower Transition Region....Pages 562-563
Plasma Heating by Current Sheets in Solar Active Regions....Pages 564-566
Chromosphere Generation in Magnetic Flux-Tubes....Pages 567-569
Coronal Magnetic Structure: the Role of Ideal MHD Invariants....Pages 570-581
Current Helicity and the Generation of Magnetic Field Aligned Currents....Pages 582-584
Nonlinear Evolution of a Force-Free Arcade Field Driven by Shear Flow....Pages 585-587
Two-Dimensional Magnetic Reconnection....Pages 588-600
Front Matter....Pages 519-519
Magnetic Field Annihilation Within a Stagnation Point Flow....Pages 601-603
Three-Dimensional Magnetic Reconnection: Basic Concepts....Pages 604-608
Atmospheric Heating in Emerging Flux Regions....Pages 609-614
Micro/Nanoflare Coronal Heating....Pages 615-629
Numerical Simulation of Microflare Evolution in the Solar Transition Region and Corona....Pages 630-633
Coronal Heating by Nanoflares: Plasma Dynamics of Elementary Events....Pages 634-636
Coronal Heating by Nanoflares: Possible Evidence of Plasmoids in Radio Occultation Data....Pages 637-639
Back Matter....Pages 641-649