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sound the ionosphere - translation to russian
общая лексика
зондировать ионосферу
![Diagram showing relations of opened heart to front of thoracic wall. Ant. Anterior segment of [[tricuspid valve]]. A O. [[Aorta]]. A.P. Anterior [[papillary muscle]]. In. [[Innominate artery]]. L.C.C. Left [[common carotid artery]]. L.S. Left [[subclavian artery]]. L.V. [[Left ventricle]]. P.A. [[Pulmonary artery]]. R.A. [[Right atrium]]. R.V. [[Right ventricle]]. V.S. [[Ventricular septum]].](https://commons.wikimedia.org/wiki/Special:FilePath/Gray1218.png?width=200 "Diagram showing relations of opened heart to front of thoracic wall. Ant. Anterior segment of [[tricuspid valve]]. A O. [[Aorta]]. A.P. Anterior [[papillary muscle]]. In. [[Innominate artery]]. L.C.C. Left [[common carotid artery]]. L.S. Left [[subclavian artery]]. L.V. [[Left ventricle]]. P.A. [[Pulmonary artery]]. R.A. [[Right atrium]]. R.V. [[Right ventricle]]. V.S. [[Ventricular septum]].")
![[[Phonocardiogram]] from normal and abnormal heart sounds.](https://commons.wikimedia.org/wiki/Special:FilePath/Phonocardiograms from normal and abnormal heart sounds.svg?width=200 "[[Phonocardiogram]] from normal and abnormal heart sounds.")
медицина
первый тон сердца
медицина
второй тон сердца
Definition
Wikipedia
The Earth–ionosphere waveguide refers to the phenomenon in which certain radio waves can propagate in the space between the ground and the boundary of the ionosphere. Because the ionosphere contains charged particles, it can behave as a conductor. The earth operates as a ground plane, and the resulting cavity behaves as a large waveguide.
Extremely low frequency (ELF) (< 3 kHz) and very low frequency (VLF) (3–30 kHz) signals can propagate efficiently in this waveguide. For instance, lightning strikes launch a signal called radio atmospherics, which can travel many thousands of kilometers, because they are confined between the Earth and the ionosphere. The round-the-world nature of the waveguide produces resonances, like a cavity, which are at ~7 Hz.
