Ionospheric Reflection and Absorption Properties of Normal Modes at ELF.

摘要

As an aid to better understanding ELF propagation in the earth-ionosphere waveguide, full-wave ELF modal height gains are analyzed as regards regions of reflection and absorption. Frequencies in the Schumann and Seafarer bands are discussed for representative day/night, ambient and disturbed ionospheres. Enhancement of the earth-ionosphere waveguide attenuation due to Sporadic E layering is discussed and the origin of the enhancement clarified. (Author)