ABSTRACT
In our solar system, the natural electromagnetic environment varies greatly from planet to planet. In the case of planet Earth, a semiliquid ferromagnetic core generates a major and slowly migrating static geomagnetic eld. Concurrently, there are much weaker natural oscillating low frequency electromagnetic elds that arise from two major sources: in thunderstorm activity in equatorial zones of Central Africa and the Amazon basin and in lesser degree from solar magnetic storms in years of high activity in the 11-year solar sunspot cycle.
