The major emphasis of this book is on physical mechanisms and sources of
the ULF/ELF natural electromagnetic fields noises. In the course of this
text, some of these mechanisms of magnetospheric origin will be treated
in detail and others in a more sketchy fashion, while the global
electromagnetic resonances excited by lightning activity and other
sources are the priority. The interested reader is referred to the books
cited in the text for details about the ULF/ELF fields of magnetospheric
origin. Much emphasis is put on studies of electromagnetic phenomena
caused by rock deformation/fracture including the ULF/ELF effects
possibly associated with tectonic activity, earthquakes and other
natural disasters. One of the challenges of this research is to fully
understand electromagnetic effects and physical processes in the rocks
deep in the Earth's crust.