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The Pen Tool is a vector drawing tool that allows us to draw paths in many Adobe programs. In addition to being complex and frustrating, the Pen tool is one of the most powerful tools in graphic design. It's absolutely essential for anyone who has interest in doing any kind of design. So join me, as we learn about the Pen tool. We'll build up from the simplest shapes slowly, and learn more complex techniques, before sending you off into a brave new world, full of points, line segments, and curve handles.

This book presents a modern treatment of the physics and phenomena of the high latitude upper atmosphere and the morphology of radio propagation in the auroral and polar regions. Chapters cover the basics of radio propagation and the use of radio techniques in ionospheric studies. Many investigations of high latitude radio propagation have previously only been published in Conference Proceedings and organizational reports. This book also includes many examples of the behavior of quiet and disturbed high latitude HF propagation.

In the years since the pioneering efforts of Sir Edward Appleton, M. A. F. Barnett, G. Breit, and M. A. Thve, many radio techniques have been employed to investigate the terrestrial ionosphere. The purposes of this book are to exam ine the basic physical interaction process of radio waves with the ionosphere, scrutinize each of the radio techniques currently in use, and describe the elements of each technique, as well as assess their capabilities and limitations. I have included some of the history of each technique, since we often tend to forget the efforts of the "pioneers." The interaction...