OPENING ADDRESS XI LIST OF PARTICIPANTS XV SESSION 1 THE ATMOSPHERE AND IONOSPHERE BELOW 150 km L. Thomas SOME OUTSTANDING PROBLEMS IN THE NEUTRAL AND IONIZED ATMOSPHERE BETWEEN 60 AND 150 km ALTITUDE 3 Peter M. Banks HIGH-LATITUDE IONOSPHERE-ATMOSPHERE INTERACTIONS (Abstract) 19 V. Domingo SOLAR RADIATION VARIATION AND CLIMATE 21 R. Bernard MAREES ET ONDES PLANETAIRES DANS LA BASSE THERMOSPHERE ET LA HAUTE MESOSPHERE 43 Michel Blanc and Paul Amayenc CONTRIBUTION OF INCOHERENT SCATTER RADARS TO THE STUDY OF MIDDLE AND LOW LATITUDE IONOSPHERIC ELECTRIC FIELDS 61 SESSION 2 THE OZONOSPHERE T. M. Donahue BASIC PROCESSES IN THE STRATOSPHERE AND THE MESOSPHERE (Abstract) 93 VI TABLE OF CONTENTS Ivar S. A. Isaksen CHEMICAL MODELS OF THE NEUTRAL ATMOSPHERE 95 M. Ackerman MEASUREMENTS OF MINOR CONSTITUENTS IN THE STRATOSPHERE 107 A. Vidal-Madjar, R. G. Roble, W. G. !iankin,G. Artzner, R. M. Bonnet, P. Lemaire, and J. C. Vial HIGH-RESOLUTION ATMOSPHERIC EXTINCTION MEASUREMENTS FROM THE FRENCH EXPERIMENT ON BOARD THE NASA SPACECRAFT OSO-8 117 M. Anderegg, J. E. Beckman, A. F. M. Moorwood, H. H. Hippelein, J. P. Baluteau, E. Bussoletti, A. Marten, and N. Coron HIGH-R~rOLUTION ATMQrPHERIC EMISSION SPECTROSCOPY AT 120 cm AND 535 cm WITH A RAPID-SCAN INTERFEROMETER AND 91 cm AIRBORNE TELESCOPE 129 Erwin Schanda, Joachim Fulde, and Klaus Kunzi MICROWAVE LIMB SOUNDING OF STRATOSPHERE AND MESOSPHERE 135 SESSION 3 METEOROLOGY IN THE IONOSPHERE AND STRATOSPHERE Hans-Jurgen Bolle CRITICAL CLIMATE PARAMETERS AND THEIR MONITORING FROM SPACE 149 R. J. Murgatroyd, A. O'Neill, and S. A.