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An Electric Coupling Model for the Lithosphere-Atmosphere-Ionosphere System 1 Seismology Forum Meeting 2014 : Recent Advances and New Findings in Seismology.

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Presentation on theme: "An Electric Coupling Model for the Lithosphere-Atmosphere-Ionosphere System 1 Seismology Forum Meeting 2014 : Recent Advances and New Findings in Seismology."— Presentation transcript:

1 An Electric Coupling Model for the Lithosphere-Atmosphere-Ionosphere System 1 Seismology Forum Meeting 2014 : Recent Advances and New Findings in Seismology L. C. Lee March 19, 2014 Institute of Earth Sciences, Academia Sinica

2 Ionosphere density variations [Liu et al., 2001] Variations of fmF2 and TEC before Chi-Chi EQ EQ 2 Lithosphere – atmosphere – ionosphere coupling Kuo, Huba, Joyce and Lee, JGR (2011, 2013)

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5 Current Dynamo from Stressed Rock 5

6 Model of DC electric field generation in the ionosphere by seismic related EMF (electro-motive force) in the lower atmosphere. 1. Earth surface, 2. Conductive layer of the ionosphere, 3. External electric current of EMF in the surface atmosphere, 4. Conductivity electric current in the atmosphere–ionosphere circuit, 5. DC electric field in the ionosphere, 6. Field-aligned electric current, and 7. Charged aerosols injected into the atmosphere by soil gases (Sorokin and Hayakawa, 2013). 6

7 Thunderstorm effect on the ionosphere J2J2 J1J1 JDJD Fair weather current 7

8 Conductivity profile [Tzur and Roble, 1985] 8

9 9 Lithosphere Dynamo

10 (1) (2) (3) (4) 10 (5)

11 11 Current density and discharge rate

12 12 Induced charge density

13 For a scalar conductivity E2E2 E1E

14 14 Induced charge density ocean

15 Electric coupling of lithosphere, atmosphere and ionosphere 15 Kuo, Huba, Joyce and Lee, (JGR, 2011)

16 16 Current density and flow in the atmosphere

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19 NRL 3D ionosphere simulation code (SAMI3) SAMI3 is a 3D low-latitude ionospheric model developed at the Naval Research Lab SAMI3 simulates the temporal and spatial evolution of seven ion species (H +,He +,N +,O +,N 2 +,NO 2 +,O 2 + ) over the entire magnetic flux tube in both hemispheres The density and velocity equations are solved for all ion species. Ion temperature equation and electron temperature equations The altitude range is ±30° and the longitude range is 8° for our case The range of magnetic apex height is 85 to 2400 km 19

20 Modified potential equation in SAMI3 (1) (2) Use Dipolar Coordinates (dipole magnetic field lines) 20

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27 Summary The magnitude of current density J rock is the most important parameter to determine the TEC variations and nighttime bubble formation in the ionosphere. The current density J rock = nA/m 2 in the earthquake fault zone can cause TEC variations of up to 2 – 20 % in daytime ionosphere. A current density J rock = nA/m 2 can lead to nighttime TEC variations of % as well as the formation of nighttime plasma bubble (equatorial spread F) extending over the whole magnetic flux tube containing the earthquake epicenter. Daytime and nighttime TEC variations and nighttime plasma bubbles within the affected region can be used as precursors for earthquake prediction. 27

28 28 Thank You 中央研究院 地球科學所 Institute of Earth Sciences, Academia Sinica Taipei, Taiwan


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