Volume 33 Issue 4
Jul.  2013
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Article Navigation >  Chinese Journal of Space Science  > 2013  >  33(4): 436-440
XU Tong, HU Yanli, WANG Min, WU Jian, WU Zhensen, SUO Yucheng. Effect of Acoustic Gravity Waves Excited by Anomalous Electric Field on Ionosphere Before Strong Earthquakes[J]. Chinese Journal of Space Science, 2013, 33(4): 436-440. doi: 10.11728/cjss2013.04.436
Citation: XU Tong, HU Yanli, WANG Min, WU Jian, WU Zhensen, SUO Yucheng. Effect of Acoustic Gravity Waves Excited by Anomalous Electric Field on Ionosphere Before Strong Earthquakes[J]. Chinese Journal of Space Science, 2013, 33(4): 436-440. doi: 10.11728/cjss2013.04.436
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Effect of Acoustic Gravity Waves Excited by Anomalous Electric Field on Ionosphere Before Strong Earthquakes

doi: 10.11728/cjss2013.04.436 cstr: 32142.14.cjss2013.04.436
  • 1.

    National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107

  • 2.

    Institute of Earthquake Science, China Earthquake Administration, Beijing 100036

  • 3.

    School of Sciences, Xidian University, Xi'an 710121

  • Received Date: 2012-05-11
  • Rev Recd Date: 2013-01-06
  • Publish Date: 2013-07-15
    Abstract
  • The study of the ionospheric disturbances prior to the occurrence of large earthquakes has attracted much attention for many years. However, until recently, the physical mechanism of seismo-ionospheric coupling is not fully understood. A strong perturbation of vertical electric field may take place within the epicentral zone a few days before strong earthquakes, which can penetrate into ionosphere through atmospheric conductivity. Acoustic gravity waves may be resulted from the non-stationary Joule heating of a local region above the epicentral zone of an imminent earthquake due to the anomalous electric field. Based on this mechanism and one-dimensional time physical model of ionosphere, the effect of acoustic gravity waves on ionosphere was calculated, which showed that the disturbance of horizontal neutral speed was too weak to have obvious effect on the ionosphere. This mechanism can not well interpret the ionospheric phenomena prior to strong earthquakes. Nevertheless, the electric field might modify ionospheric dynamic and electron density distribution through the effect of E×B.

     

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