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Growth and Inhibition of Equatorial Anomaly Prior to an Earthquake (EQ): Case Studies with Total Electron Content (TEC) Data for Major EQs of Japan 2011 and Indonesia 2012

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Positioning 2013年第3期4卷 240-252页

作者： Minakshi Devi Alaka Medhi Arup Jyoti Dev Sarma Sarma Ananda Kumar Barbara Department of Physics Gauhati University Guwahati India.

The processes leading to the growth and inhibition of equatorial anomaly before major earthquake (EQ) were viewed in this paper by examining global Total Electron Content (TEC) that contoured over longitude sectors covering Africa to Pacific, in association with EQ events of Japan (M = 9) that occurred at 135°E to 145°E and 35°N to 40°N, on March 9 and 11, 2011 and of Indonesia (M = 8.6) that took place at 2.311°N, 93°E, in April 11, 2012. The paper focuses on the development of abnormal increase in density in the night sector around—10° latitude zone prior to the two major EQ events, though their epicenters are separated widely from the anomaly region. The f-layer density variations from relevant locations and TEC features obtained from GPS at Appleton anomaly crest station are utilized as supporting inputs. The possible sources leading to the anomalous development in density are discussed in the frame of EQ time consequences of lithospheric-atmospheric processes between the equator and beyond. The role of electric field generated by pre EQ preparatory activities and dynamical coupling modes through seismic fault line are brought in to the ambit of discussion.

关键词： TEC Global Earthquake Equatorial Anomaly f-layer Density

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The low latitude ionospheric effects of the April 2000 magnetic storm near the longitude 120°E

The low latitude ionospheric effects of the April 2000 magne...

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中国科学院地质与地球物理研究所2004学术年会

作者： Libo Liu~1,Weixing Wan~1,C.C.Lee~2,Baiqi Ning~1,and J.Y.Liu~2 1 Institute of Geology and Geophysics,CAS,Beijing,100029,China 2 Institute of Space Science,National Central University,Chung-Li 320,Taiwan

In this paper,we report the responses of the low latitude ionosphere near the longitude 120°E to the April 2000 geomagnetic storm using Digisonde data measured at Chungli(25.0°N,121.2°E,Mag.13.8°N),Wuhan(30.6°N, 114.4°E,Mag.19.3°N),and Kokubunji(35.7°N,139.5°E,Mag.25.7°N).At these three stations,the significant ionospheric responses are near-simultaneous height disturbances after the sudden storm commencement(SSC) on April 6,2000 and wave-like disturbances in the daytime on April *** ionospheric height disturbances in the nighttime after the SSC at these stations are suggested to be caused by the storm related perturbed electric fields, and the followed wave-like disturbances may be caused by storm induced atmospheric gravity *** vertical effective winds derived from Digisonde measurements imply the existence of significantly large vertical drifts during this storm,which are in agreement with the perturbed zonal electric fields predicted by the model of fejer and Scherliess(1997) and Scherliess and fejer(1997).finally,the storm time derivations of fof2 from its monthly median level at these stations are used to validate the predication ability of the empirical model of Araujo-Pradere et al.(2002),which has included in the International Reference Ionosphere model IRI2000.

关键词： Geomagnetic storm ionospheric storm f-layer low latitude perturbed electric field International Reference Ionosphere

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