Mesospheric Models And Related Experiments: Proceedings Of The Fourth Esrin-eslab Symposium Held In Frascati, Italy, 6?10 July, 1970 (astrophysics And Space Science Library)

In July 1967 ESRIN and ESLAB, the two ESRO laboratories primarily concerned with basic research, held a joint symposium on Satellite and Rocket Measurements of Corpuscular Radiation from Outer Space. This was followed in September 1968 by a second symposium: Low-Frequency Waves and Irregularities in the Ionosphere; and in September 1969 by a third: Intercorrelated Satellite Observations Related to Solar Events. A fourth symposium, on upper atmospheric models and related experiments, took place in Frascati, 6-10 July 1970. The main aim of the symposium was to ~ssess current experimental work - both field and laboratory - related to mesospheric struc­ ture and composition, in the light of theoretical work on atmospheric models and atomic and molecular processes. To foster an interdisciplinary approach, the meeting brought together approximately 50 scientists working with different techniques but having a common interest in the interpretation of meso spheric phenomena. Recent work such as that presented at the symposium has deepened our knowledge of upper atmospheric composition, and increased our understanding of upper atmo­ spheric temperature and dynamics. In particular, it has shown that the concentration of minor species in the atmosphere is somewhat different than expected. Theoretical models have not yet considered many of the minor constituents and have generally not included dynamical effects. It is now time to reconsider these models and elaborate them in the light of recent knowledge. Front Matter....Pages I-VIII Aeronomic Reactions of Hydrogen and Ozone....Pages 1-51 A Meridional Model of the Oxygen-Hydrogen Atmosphere....Pages 52-64 Oxygen, Hydrogen and Nitrogen Constituents in the Mesosphere and Ionization Processes....Pages 65-77 Energy Conversions and Mean Vertical Motions in the High Latitude Summer Mesosphere and Lower Thermosphere....Pages 78-88 Photochemistry and the Escape Efficiency of Terrestrial Hydrogen....Pages 89-102 On the Introduction of Transport Processes into Mesospheric Models....Pages 103-103 Dynamical Modelling of the Stratosphere and Mesosphere....Pages 104-121 Tides and Gravity Waves in the Upper Atmosphere....Pages 122-130 The Meteorological Structure of the Mesosphere Including Seasonal and Latitudinal Variations....Pages 131-146 Nocturnal Variations in the OH (8-3) Band Airglow....Pages 147-148 Ultraviolet Solar Radiation Related to Mesospheric Processes....Pages 149-159 Penetration of Solar Radiation in the Schumann-Runge Bands of Molecular Oxygen....Pages 160-176 Relaxation of the 2.7μ and 4.3μ Bands of Carbon Dioxide....Pages 177-187 Laboratory Measurements of D -Region Ion-Molecule Reactions....Pages 188-197 The Roles of Water Vapor and Nitric Oxide in Determining Electron Densities in the D -Region....Pages 198-209 Discussion of the Formation of Major Positive and Negative Ions up to the 50 km Level....Pages 210-219 Electronic Collisions....Pages 220-230 Laboratory Studies of Elementary Reactions of Neutral Species Containing O or H....Pages 231-239 The Photochemistry of Ozone and Singlet Molecular Oxygen in the Atmosphere....Pages 240-252 Laboratory Investigations of the Primary Products of Ozone Photolysis....Pages 253-260 On the Origin of Noctilucent Clouds....Pages 261-265 The Rate Constants of Some Ion-Molecule and Ion-Electron Reactions, from in Situ Ionospheric Measurements....Pages 266-267 On the Semiannual Variation of the Upper Atmosphere....Pages 268-272 Rocket Measurements of ION and Electron Densities in the D -Region During Sunrise....Pages 273-273 Ion Densities in the Lower D -Region Measured with a Parachuted Probe....Pages 274-278 Ion Composition in the E and Lower F -Region Above Kiruna at Sunset and Sunrise....Pages 279-282 Rocket Mass Spectrometry in Japan....Pages 283-283 Measurement of Submillimeter-Wave Stratospheric Emission Spectra....Pages 284-285 Some Effects of Dimers of the Water Molecule in the Atmosphere....Pages 286-291 ....Pages 292-298