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The auroral emissions in the upper atmosphere of the polar regions of the Earth are evidence of the capture of energetic particles from the Sun, streaming by the Earth as the solar wind. These auroral emissions, then, are a window to outer space, and can provide us with valuable information about electrodynamic coupling processes between the solar wind and the Earth's ionosphere and upper atmosphere. Studying the physics of these phenomena extends our understanding of our plasma universe.

Ground-based remote-sensing techniques, able to monitor continuously the variations in the...

These proceedings are based upon in~roductory talks, re- search repor~s and discussions at the NATO Advanced Work- shop on ELECTROMAGNETIC COUPLING IN THE POLAR CLEFTS AND CAPS, held at Lillehammer, Norway, 20-24th September 1988. By this book we will make the information which was pro- vided to the participants of the workshop, accessible to a wider audience. Electromagnetic processes governing particle, momen- tum, and energy transfer from the solar wind via the magne- tosphere and into the earth's upper atmosphere are the main topics of solar-terrestrial research. Due to the peculiar...