Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Nat. Hazards Earth Syst. Sci., 11, 1759-1768, 2011
https://doi.org/10.5194/nhess-11-1759-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
21 Jun 2011
The neutral temperature in the ionospheric dynamo region and the ionospheric F region density during Wenchuan and Pingtung Doublet earthquakes
Y. Y. Sun1, K.-I. Oyama2, J. Y. Liu1, H. K. Jhuang1, and C. Z. Cheng2 1Institute of Space Science, National Central University, No. 300, Jhongda Road, Jhongli City, Taoyuan County 320, Taiwan
2Plasma and Space Science Center, National Cheng Kung University, No. 1, University Road, Tainan City 701, Taiwan
Abstract. One of the possible candidates which modifies the ionosphere before large earthquake is electric field. We presume that the electric field associated with large earthquakes is generated in the ionosphere dynamo region (100–120 km). This paper tries to identify the evidence of the contribution of the neutral atmosphere in the dynamo region. The relationship between the critical frequency at the F2 peak (foF2) and the height profile of the neutral atmosphere temperature was studied for two large earthquakes: Wenchuan, 2008 and Pingtung Doublet, 2006. It is found that the wave amplitude of the vertical wavelength 20–30 km which is usually superposed on the height profile of the neutral atmosphere temperature enhances when the foF2 increases. The correlation between the wave amplitude and foF2 is found better along a longitudinal direction than along latitude direction.

Citation: Sun, Y. Y., Oyama, K.-I., Liu, J. Y., Jhuang, H. K., and Cheng, C. Z.: The neutral temperature in the ionospheric dynamo region and the ionospheric F region density during Wenchuan and Pingtung Doublet earthquakes, Nat. Hazards Earth Syst. Sci., 11, 1759-1768, https://doi.org/10.5194/nhess-11-1759-2011, 2011.
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