Ionospheric effects of ground motion: The roles of magnetic field and nonlinearity

Transformation of infrasound to magnetic sound upon propagation from ground level up to the ionosphere is considered. It is shown that upon entering the ionospheric layers at altitudes of order 150–170 km, the wave dynamics changes sharply. Nonlinear effects, including shock formation, are also cons...

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Bibliographic Details
Published inJournal of atmospheric and solar-terrestrial physics Vol. 70; no. 10; pp. 1273 - 1280
Main Author Ostrovsky, Lev A.
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 01.07.2008
Elsevier
Subjects
Earth, ocean, space
Exact sciences and technology
External geophysics
Ground motions
Ionosphere
Magnetoacoustic waves
Nonlinearity
Physics of the ionosphere
Physics of the magnetosphere
Nonlinearity
Ground motions
Ionosphere
Magnetoacoustic waves
models
Magnetoacoustic wave
Plasma
magnetic field
dynamics
Sound propagation
Oblique propagation
Non linear effect
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Summary:Transformation of infrasound to magnetic sound upon propagation from ground level up to the ionosphere is considered. It is shown that upon entering the ionospheric layers at altitudes of order 150–170 km, the wave dynamics changes sharply. Nonlinear effects, including shock formation, are also considered. The shocks are typically formed in a relatively narrow range of altitudes, or not formed at all. Generalization of the model to a case of oblique propagation is briefly considered, and the effects of atmospheric profile variation and of finite plasma conductivity are estimated. Along with providing qualitative insight, the model gives some realistic estimates for waves generated by earthquakes.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1364-6826
1879-1824
DOI:10.1016/j.jastp.2008.03.017