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| Titel |
Anomalies of electron density and velocity in the ionosphere before large earthquake: Comparison between DEMETER observations and SAMI3 simulations |
| VerfasserIn |
Yi-Ying Ho, Lou-Chuang Lee, Cheng-Ling Kuo, Hau-Kun Jhuang, Michel Parrot |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250124263
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| Publikation (Nr.) |
 EGU/EGU2016-3668.pdf |
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| Zusammenfassung |
| In this study, we use DEMETER satellite data to analyze the ionospheric plasma
density (Ne) and velocity perpendicular to the magnetic field line (V ⊥) before large
earthquakes. The observations of density and velocity anomalies before the 2010 Chile
earthquake, 2009 Kermadec Islands earthquake and 2009 Samoa Islands earthquake are
studied. The percentage density variation (ΔNe/Ne) and perpendicular velocity (V ⊥)
are positively correlated. The slope between the percentage density variation and
perpendicular velocity increases with geomagnetic latitude. The results from observations
and from the model simulation are compared. The slope obtained from SAMI3
simulation with an imposed eastward electric field (E) is generally higher than those
obtained from DEMETER. The slope of the density variation and perpendicular
velocity increases with increasing imposed electric field. On the other hand, the slope
generally increases with geomagnetic latitude with the same imposed electric field. |
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