Our Electromagnetic World
Meeting 2
In this meeting we will walk through the science and applications of static and time-varying electric and magnetic fields and how they enable communication, power delivery, navigation, home conveniences, transportation, illumination and even perception of the world around us. We will look at the vulnerability of modern communication systems to geomagnetic storms and human-produced interferences. We will also learn how Faraday cages can be used to protect us from EM interference and even catastrophe. We will even look back to the role Earth’s geomagnetic field may have played in stimulating evolution.
This topic was stimulated by an OLLI member asking why ham radio signals seem to work when other radio signals are more limited, especially at night. For a peek-in-the-box about radio signal propagation, one of the main topics of this class, I suggest you view this very informative video.
