Measurements in an underground quarry reveal medium-wave signals propagating with a depth-dependent vertical magnetic field component, indicating a subground wave structure not explained by conventional Zenneck-Sommerfeld models.
(1907), Über die Fortpflanzung ebener elektromagnetischer Wellen längs einer ebenen Leiterfläche und ihre Beziehung zur drahtlosen Telegraphie, Annalen der Physik, 328, 846–866
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Subsurface Propagation Characteristics of Medium-Wave Electromagnetic Fields Revealed by Measurements in the Nanatsuo-guchi Quarry: Conceptual Framework of the Subground Wave and the Rainfall Model
Measurements in an underground quarry reveal medium-wave signals propagating with a depth-dependent vertical magnetic field component, indicating a subground wave structure not explained by conventional Zenneck-Sommerfeld models.