Seismo-ionospheric coupling appearing as equatorial electron density enhancements observed via DEMETER electron density measurements

Abstract : We report the processes and results of statistical analysis on the ionospheric electron density data measured by the Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions (DEMETER) satellite over a period of 6 years (2005–2010), in order to investigate the correlation between seismic activity and equatorial plasma density variations. To simplify the analysis, three equatorial regions with frequent earthquakes were selected and then one-dimensional time series analysis between the daily seismic activity indices and the equatorial ionization anomaly (EIA) intensity indices, which represent relative equatorial electron density increase, were performed for each region. The statistically significant values of the lagged cross-correlation function, particularly in the region with minimal effects of longitudinal asymmetry, indicate that some of the very large earthquakes with M > 5.0 in the low-latitude region can accompany observable precursory and concurrent EIA enhancements, even though the seismic activity is not the most significant driver of the equatorial ionospheric evolution. The physical mechanisms of the seismo-ionospheric coupling is consistent with our observation, and the possibility of earthquake prediction using the EIA intensity variation is discussed.
Document type :
Journal articles
Liste complète des métadonnées

Cited literature [54 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-01174160
Contributor : Nathalie Pothier <>
Submitted on : Tuesday, July 21, 2015 - 10:23:03 AM
Last modification on : Friday, April 5, 2019 - 8:19:25 PM
Document(s) archivé(s) le : Thursday, October 22, 2015 - 10:11:31 AM

File

Ryu_et_al-2014-Journal_of_Geop...
Publisher files allowed on an open archive

Identifiers

Collections

Citation

K Ryu, E Lee, J.S. Chae, Michel Parrot, S Pulinets. Seismo-ionospheric coupling appearing as equatorial electron density enhancements observed via DEMETER electron density measurements. Journal of Geophysical Research : Space Physics, American Geophysical Union/Wiley, 2014, 119, pp.8524-8542. 〈10.1002/2014JA020284〉. 〈insu-01174160〉

Share

Metrics

Record views

201

Files downloads

111