An improved coupling model for the lithosphere‐atmosphere‐ionosphere system

In our previous model for the lithosphere-atmosphere-ionosphere coupling, the background magnetic field was assumed to be perpendicular to the horizontal plane. In the present paper, we improve the calculation of currents in the atmosphere by solving the current density J directly from the current continuity equation ∇  •  J  =  0. The currents in the atmosphere can be solved for any arbitrary angle of magnetic field, i.e., any magnetic latitude. In addition, a large ratio (~10) of Hall to Pedersen conductivities is used to generate a large Hall electric field. The effects of atmospheric currents and electric fields on the ionosphere with lithosphere current source located at magnetic latitudes of 7.5°, 15°, 22.5°, and 30° are obtained. For upward (downward) atmospheric currents flowing into the ionosphere, the simulation results show that the westward (eastward) electric fields dominate. At magnetic latitude of 7.5° or 15°, the upward (downward) current causes the increase (decrease) of total electron content (TEC) near the source region, while the upward (downward) current causes the decrease (increase) of TEC at magnetic latitude of 22.5°or 30°. The dynamo current density required to generate the same amount of TEC variation in the improved model is found to be smaller by a factor of 30 as compared to that obtained in our earlier paper. We also calculate the ionosphere dynamics with imposed zonal westward and eastward electric field based on SAMI3 code. It is found that the eastward (westward) electric field may trigger one (two) plasma bubble(s) in the nighttime ionosphere.

[1]  Jann‐Yenq Liu,et al.  Coseismic ionospheric disturbances triggered by the Chi-Chi earthquake , 2010 .

[2]  O. Zolotov,et al.  Physical interpretation and mathematical simulation of ionospheric precursors of earthquakes at midlatitudes , 2012, Geomagnetism and Aeronomy.

[3]  S. Pulinets,et al.  The ionospheric perturbations prior to the Chi-Chi and Chia-Yi earthquakes , 2002 .

[4]  V. M. Chmyrev,et al.  Observation by space-borne detectors of electric fields and hydromagnetic waves in the ionosphere over an earthquake centre , 1989 .

[5]  Ludger Scherliess,et al.  Radar and satellite global equatorial F-region vertical drift model , 1999 .

[6]  J. Huba,et al.  Three‐dimensional equatorial spread F modeling , 2008 .

[7]  Y. J. Chuo,et al.  Variations of ionospheric total electron content during the Chi‐Chi Earthquake , 2001 .

[8]  S. Pulinets,et al.  Spatial–Temporal Characteristics of Large Scale Disturbances of Electron Density Observed in the Ionospheric F-Region before Strong Earthquakes , 2003 .

[9]  S. Pulinets,et al.  Ionospheric precursors of earthquakes , 2004 .

[10]  M. Parrot.  Use of satellites to detect seismo-electromagnetic effects , 1995 .

[11]  M. N. Cahyadi,et al.  Ionospheric disturbances of the 2007 Bengkulu and the 2005 Nias earthquakes, Sumatra, observed with a regional GPS network , 2013 .

[12]  M. Parrot,et al.  Statistical analysis of an ionospheric parameter as a base for earthquake prediction , 2013 .

[13]  M. Parrot,et al.  Temporal and spatial analyses on seismo-electric anomalies associated with the 27 February 2010 M = 8.8 Chile earthquake observed by DEMETER satellite , 2013 .

[14]  Masashi Hayakawa,et al.  A statistical study on the correlation between lower ionospheric perturbations as seen by subionospheric VLF/LF propagation and earthquakes , 2010 .

[15]  Cheng-Ling Kuo,et al.  Ionosphere plasma bubbles and density variations induced by pre‐earthquake rock currents and associated surface charges , 2011 .

[16]  Dimitar Ouzounov,et al.  The physical nature of thermal anomalies observed before strong earthquakes , 2006 .

[17]  M. Hayakawa,et al.  Generation of Seismic-Related DC Electric Fields and Lithosphere-Atmosphere-Ionosphere Coupling , 2013 .

[18]  Libo Liu,et al.  Is an unusual large enhancement of ionospheric electron density linked with the 2008 great Wenchuan earthquake , 2008 .

[19]  M. Hayakawa,et al.  Fractal characteristics of the ground-observed ULF emissions in relation to geomagnetic and seismic activities , 2007 .

[20]  M. R. Saradjian,et al.  Electron and ion density variations before strong earthquakes (M>6.0) using DEMETER and GPS data , 2010 .

[21]  Sergey Pulinets,et al.  Main phenomenological features of ionospheric precursors of strong earthquakes , 2003 .

[22]  Yi-Ben Tsai,et al.  Seismo‐ionospheric signatures prior to M≥6.0 Taiwan earthquakes , 2000 .

[23]  Recent Seismic Electric Signals (SES) activities in Greece , 2006 .

[24]  A. Deschamps,et al.  High-frequency seismo-electromagnetic effects , 1993 .

[25]  O. Zolotov,et al.  Variations in the total electron content of the ionosphere during preparation of earthquakes , 2011 .

[26]  Sergey Pulinets,et al.  Physical mechanism of the vertical electric field generation over active tectonic faults , 2009 .

[27]  F. Freund,et al.  Earthquake forewarning — A multidisciplinary challenge from the ground up to space , 2013, Acta Geophysica.

[28]  Yi-Ben Tsai,et al.  Pre-earthquake ionospheric anomalies registered by continuous GPS TEC measurements , 2004 .

[29]  Glenn Joyce,et al.  Sami2 is Another Model of the Ionosphere (SAMI2): A new low-latitude ionosphere model , 2000 .

[30]  Sergey Pulinets,et al.  Quasielectrostatic Model of Atmosphere-Thermosphere-Ionosphere Coupling , 2000 .

[31]  K. Heki.  Ionospheric electron enhancement preceding the 2011 Tohoku‐Oki earthquake , 2011 .

[32]  E. L. Afraimovich,et al.  The shock-acoustic waves generated by earthquakes , 2001 .

[33]  S. Pulinets,et al.  Lithosphere-Atmosphere-Ionosphere Coupling (LAIC) Model - An Unified Concept for Earthquake Precursors Validation , 2011 .

[34]  F. Freund,et al.  Time-resolved study of charge generation and propagation in igneous rocks , 2000 .

[35]  F. Freund.  Charge Generation and Propagation in Igneous Rocks , 2002 .

[36]  M. Parrot,et al.  Variations of electron density and temperature in ionosphere based on the DEMETER ISL data , 2010 .

[37]  S. Pulinets,et al.  Formation mechanism of great positive TEC disturbances prior to Wenchuan earthquake on May 12, 2008 , 2011 .

[38]  C. Dunson,et al.  Investigation of ULF magnetic pulsations, air conductivity changes, and infra red signatures associated with the 30 October Alum Rock M5.4 earthquake , 2009 .

[39]  M. Hayakawa,et al.  A perturbation of DC electric field caused by light ion adhesion to aerosols during the growth in seismic-related atmospheric radioactivity , 2007 .

[40]  S. Asai,et al.  The observation of Doppler shifts of subionospheric LF signal in possible association with earthquakes , 2012 .

[41]  J. Liu,et al.  Ionospheric electron content anomalies detected by a FORMOSAT-3/COSMIC empirical model before and after the Wenchuan Earthquake , 2010 .

[42]  M. Hayakawa.  VLF/LF Radio Sounding of Ionospheric Perturbations Associated with Earthquakes , 2007, Sensors (Basel, Switzerland).

[43]  Alexander Schekotov,et al.  ULF/ELF magnetic field variations from atmosphere induced by seismicity , 2007 .

[44]  F. Freund.  Toward a unified solid state theory for pre-earthquake signals , 2010 .

[45]  Yoshihiro Kakinami,et al.  Latitudinal distribution of anomalous ion density as a precursor of a large earthquake , 2011 .

[46]  E. Astafyeva,et al.  Dependence of waveform of near-field coseismic ionospheric disturbances on focal mechanisms , 2009 .

[47]  Julia Ling,et al.  Air ionization at rock surfaces and pre-earthquake signals , 2009 .

[48]  Dimitar Ouzounov,et al.  Mid-infrared emission prior to strong earthquakes analyzed by remote sensing data , 2004 .

[49]  M. Hayakawa,et al.  ULF electromagnetic noise due to random variations of background atmospheric current and conductivity , 2007 .

[50]  O. Zolotov,et al.  Manifestations of the earthquake preparations in the ionosphere total electron content variations , 2012 .

[51]  Dimitar Ouzounov,et al.  Satellite thermal IR phenomena associated with some of the major earthquakes in 1999–2003 , 2006 .

[52]  Masashi Kamogawa,et al.  Short-term earthquake prediction: Current status of seismo-electromagnetics , 2009 .

[53]  Chien-Hung Lin,et al.  Seismoionospheric GPS total electron content anomalies observed before the 12 May 2008 Mw7.9 Wenchuan earthquake , 2009 .