Abstract
The Earth–ionosphere spherical cavity occupies three dimensions. SR corresponds to radio waves circling the globe, to the ‘longitudinal’ propagation. There is the transverse (vertical) direction of radio wave propagation: between the ground surface and the lower edge of the ionosphere. In the present chapter we briefly describe the natural pulsed signals associated with the transverse resonance of the Earth–ionosphere cavity. This resonance occupies the ELF/VLF frequency band with the basic frequency about 1.6–1.7 kHz. When speaking in terms of subionospheric radio propagation, the transverse resonance frequencies correspond to the cut-off frequencies of the Earth–ionosphere duct. The pulsed transverse resonance signals arriving from great distances are also called ‘tweek–atmospherics’. We use a record of typical tweeks to demonstrate the ‘Kharkov technique’ yielding the simultaneous source location and finding the waveguide effective height. In addition, we discuss properties of ionospheric Alfvén resonance (IAR) that is observed below the basic SR frequency. We present some experimental data and their interpretation in terms of the resonance of the plasma slab bounded by the lower ionosphere and the plasmapause.
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Nickolaenko, A., Hayakawa, M. (2014). Signals in Adjoining Frequency Bands. In: Schumann Resonance for Tyros. Springer Geophysics. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54358-9_12
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