MADS meeting aucostruttori del sud
MADS meeting aucostruttori del sud

ETNA RADIO OBSERVATORY
TOOLS AND TEST GALLERY
 

SRS - Spectral Resonance Structures 
 

MADS meeting aucostruttori del sud
MADS meeting aucostruttori del sud

radio nature and the sounds of a thunderstorm

ERO recording with NASA INSPIRE VLF-3 receiver

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PC_04_29AUG15-0000_coil-8h

In 1976, Polyakov (1976) predicted the existence of ionospheric Alfvén resonator (IAR), equivalent to the ionospheric waveguide, but operating in vertical direction with shear Alfvén waves. According to the theory, further developed by Polyakov and Rapoport (1981), waves can be trapped between two altitudes characterized by large Alfvén velocity gradients: the lower limit occurs at ionospheric F-layer, the upper limit at about 3000 km. For a review, see, e.g., Lysak (1993).