Geomagnetic pulsations caused by the Sumatra earthquake on December 26, 2004

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 2019-03-25T00:54:44+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.

show abstract

“…Iyemori et al (2005) describe a pulsation of period 3.6 min (Pc5) observed in Phimai, Thailand, 12 min after the Sumatra earthquake on 26…”

Section: Geomagnetic Pulsationsmentioning

confidence: 99%

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

Simões¹,

Pfaff²,

Berthelier³

et al. 2011

Dynamic Coupling Between Earth’s Atmospheric and Plasma Environments

View full text Add to dashboard Cite

show abstract

“…First, co-/post-seismic phenomena have been reported. Iyemori et al (2005) reported geomagnetic pulsations that may have been caused by the 2004 S. Hirooka et al: Neural network based tomographic approach Sumatra-Andaman earthquake. The observed geomagnetic pulsations suggest the existence of a large current in space caused by acoustic waves based on surface displacements.…”

Section: Introductionmentioning

confidence: 99%

Neural network based tomographic approach to detect earthquake-related ionospheric anomalies

Hirooka

Hattori

Nishihashi³

et al. 2011

Nat. Hazards Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract.A tomographic approach is used to investigate the fine structure of electron density in the ionosphere. In the present paper, the Residual Minimization Training Neural Network (RMTNN) method is selected as the ionospheric tomography with which to investigate the detailed structure that may be associated with earthquakes. The 2007 Southern Sumatra earthquake (M = 8.5) was selected because significant decreases in the Total Electron Content (TEC) have been confirmed by GPS and global ionosphere map (GIM) analyses. The results of the RMTNN approach are consistent with those of TEC approaches. With respect to the analyzed earthquake, we observed significant decreases at heights of 250-400 km, especially at 330 km. However, the height that yields the maximum electron density does not change. In the obtained structures, the regions of decrease are located on the southwest and southeast sides of the Integrated Electron Content (IEC) (altitudes in the range of 400-550 km) and on the southern side of the IEC (altitudes in the range of 250-400 km). The global tendency is that the decreased region expands to the east with increasing altitude and concentrates in the Southern hemisphere over the epicenter. These results indicate that the RMTNN method is applicable to the estimation of ionospheric electron density.

show abstract

“…3). In addition to seismic waves detected by global seismic networks (Park et al, 2005); co-seismic displacement measured by GPS (Vigny et al, 2005); oceanic sea surface variations measured by altimetry (Smith et al, 2005); detection of magnetic anomaly (Balasis & Mandea, 2007;Iyemori et al, 2005) and acoustic-gravity waves (Le Pichon et al, 2005); a series of ionospheric disturbances, observed with different techniques, have been reported in the literature (DasGupta et al, 2006;Liu et al, 2006a;Lognonné et al, 2006;Occhipinti et al, 2006;2008b). Two ionospheric anomalies in the plasma velocities were detected North of the epicenter by a Doppler sounding network in Taiwan (Liu et al, 2006a).…”

Section: The Modern Debatementioning

confidence: 99%

Tsunami Detection by Ionospheric Sounding: New Tools for Oceanic Monitoring

Occhipinti¹

2011

Tsunami - A Growing Disaster

View full text Add to dashboard Cite

Geomagnetic pulsations caused by the Sumatra earthquake on December 26, 2004

Cited by 105 publications

References 10 publications

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

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

Neural network based tomographic approach to detect earthquake-related ionospheric anomalies

Tsunami Detection by Ionospheric Sounding: New Tools for Oceanic Monitoring

Contact Info

Product

Resources

About