The papers presented in this volume are derived from five sessions on Active Experiments in Space. The topics covered include ion and electron beams, ionospheric modification, spacecraft interactions, chemical releases, and plasma waves and other topics. Auroras and plasma emissions were reported from electron beam injection experiments on the EXCEDE III rocket and APEX satellite respectively. The important parameters affecting the charging of spacecraft during the operation of electron guns is now much better understood. A new mission called AMPAS (Active Magnetospheric Particle Acceleration Satellite) utilising dual-payload tethered satellites and both up and downward directed electron beams was proposed to study the magnetosphere. Recent results and associated theories from the Sura, Arecibo and Tromso ionospheric heating facilities were presented. Results of E-region heating. VLF noise generation and VLF-ducts being affected by HF heating, and long period Doppler oscillations from the F-region were intriguing. Much progress has been made in coming to a fuller understanding of the many detailed features of stimulated electromagnetic emissions (SEE) produced by a powerful HF wave. The effects of neutral gases on spacecraft charging was examined in a series of rocket flights. These studies as well as others investigating high voltage charged spacecraft are leading to a much improved understanding of interactions between spacecraft and the plasma environment. Many results, both ground-based and from spacecraft, were presented from the Combined Release and Radiation Effects Satellite (CRRES) chemical release experiments. Electromagnetic wave emissions, ionospheric wave-like disturbances and aerosol clouds from the release were studied.

Table of Contents:
AMPAS - a new active experiment mission, T. Neubert et al; energy deposition in the upper atmosphere in the excede III experiment, R.L. McNutt et al; new aspects of whistler waves driven by an electron beam studied by a 3-D electromagnetic code, K.-I. Nishikawa et al; remote spacecraft observations of waves excited by the pulse electron beam injected into ionosphere, H. Rothkaehl et al; factors influencing the heating of the auroral electrojet by high power radio waves, T.R. Robinson et al; enhancement of VLF-ducts under the action of high power radio wave on the ionospheric F-region, V.V. Vas'kov et al; investigations of artificial HF plasma turbulence features using stimulated electromagnetic emission, E.N. Sergeev et al; impact of microwave discharges on the lower ionosphere and middle atmosphere, S.I. Kozlov et al; the interaction of high-voltage spheres with the ionosphere, R.W. Schunk and T.-Z. Ma; transient measurements of HV interaction with the ambient and perturbed space environment, D.C. Thompson et al; high frequency electromagnetic radiation in CRRES geostationary injections, V.N. Oraevsky et al; images of optically thick artificial aerosol clouds in the near-earth space, Yu.E. Belikov and A.V. Gurvich; ionization and recombination processes determining plasma density at the initial stage of artificial cloud injection, V.I. Badin and Yu.V. Dumin; optical observations of artificial clouds in the CRRES experiments, G.P. Milinevsky et al; seismoionospheric fountain-effect as analogue of active space experiment, A.Kh. Depueva and Yu.Ya. Ruzhin.