Acoustic-gravity waves in the Earth's ionosphere

Kaladze, T. D.; Pokhotelov, O. A.; Shah, H. A.; Khan, Momna; Stenflo, L.

doi:10.1016/j.jastp.2008.06.009

Cited by 69 publications

(49 citation statements)

References 37 publications

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“…On the other hand, establishing causality between lightning acoustic and electromagnetic transients far from the source is not straightforward. Although connections between thermospheric gravity waves and lightning have been suggested (e.g., Chiu et al, 1979;Liao et al, 1989;Kaladze et al, 2008), a positive correlation is possibly due to deep convective activity in thunderstorms. Davis and Johnson (2005) identify a lightning-induced intensification of sporadic-E. Because no ionospheric response to low-pressure systems without lightning is detected, they conclude that sporadic-E localized intensification can be attributed to lightning.…”

Section: Discussionmentioning

confidence: 99%

A Review of Low Frequency Electromagnetic Wave Phenomena Related to Tropospheric-Ionospheric Coupling Mechanisms

et al. 2011

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Investigation of coupling mechanisms between the troposphere and the ionosphere requires a multidisciplinary approach involving several branches of atmospheric sciences, from meteorology, atmospheric chemistry, and fulminology to aeronomy, plasma physics, and space weather. In this work, we review low frequency electromagnetic wave propagation in the Earthionosphere cavity from a troposphere-ionosphere coupling perspective. We discuss electromagnetic wave generation, propagation, and resonance phenomena, considering atmospheric, ionospheric and magnetospheric sources, from lightning and transient luminous events at low altitude to Alfven waves and particle precipitation related to solar and magnetospheric processes. We review in situ ionospheric processes as well as surface and space weather phenomena that drive troposphere-ionosphere dynamics. Effects of aerosols, water vapor distribution, thermodynamic parameters, and cloud charge separation and electrification processes on atmospheric electricity and electromagnetic waves are reviewed. We also briefly revisit ionospheric irregularities such as spread-F and explosive spread-F, sporadic-E, traveling ionospheric disturbances, Trimpi effect, and hiss and plasma turbulence. Regarding the role of the lower boundary of the cavity, we review transient surface phenomena, including seismic activity, earthquakes, volcanic processes and dust electrification. The role of surface and https://ntrs.nasa.gov/search.jsp?R=20120011991 2018-05-12T18:35:14+00:00Z atmospheric gravity waves in ionospheric dynamics is also briefly addressed. We summarize analytical and numerical tools and techniques to model low frequency electromagnetic wave propagation and solving inverse problems and summarize in a final section a few challenging subjects that are important for a better understanding of tropospheric-ionospheric coupling mechanisms.

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Section: Discussionmentioning

confidence: 99%

A Review of Low Frequency Electromagnetic Wave Phenomena Related to Tropospheric-Ionospheric Coupling Mechanisms

et al. 2011

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“…For further theoretical analysis of the interaction between AGW and the wind one needs also to consider the influence of the geomagnetic field on AGW properties (Kaladze et al, 2008;Khantadze et al, 2010).…”

Section: Wind Control Of Agwsmentioning

confidence: 99%

A dominant acoustic-gravity mode in the polar thermosphere

et al. 2015

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Abstract. The article presents a summary of the main findings of the systematic study of acoustic-gravity waves (AGWs) in the polar thermosphere. This study was based on the in situ measurements made by the Dynamics Explorer 2 (DE2) spacecraft late in its mission when it descended low enough (250-400 km). It was found out that AGWs in the polar thermosphere are observed within a narrow frequency band close to the Brunt-Väisälä frequency and with horizontal wavelengths about 500-600 km. The broadband spectrum of travelling ionospheric disturbance (TID) frequencies observed by radars is caused by the Doppler effect. The AGW amplitudes do not depend on the altitude, but grow almost linearly with the wind velocity. They propagate towards the wind.

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“…The study of the effects due to propagation of gravity waves to the ionosphere is based on the theory of wave propagation in the neutral atmosphere. Sorokin and Fedorovich (1982), Kaladze et al (2007Kaladze et al ( , 2008 studied the action of the external geomagnetic field on the gravity waves in the ionosphere at rest. Similar method has been used by Kaladze et al (2003) for the study of planetary waves in the ionospheric E-layer.…”

Section: Introductionmentioning

confidence: 99%