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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50642

    Title: Spatial pattern of a seismo-ionospheric signature using principal component analysis
    Authors: Lin,JW
    Contributors: 太空及遙測研究中心
    Date: 2011
    Issue Date: 2012-03-27 17:49:46 (UTC+8)
    Publisher: 國立中央大學
    Abstract: This article uses principal component analysis (PCA) to determine the spatial pattern of total electron content (TEC) anomalies in the ionosphere corresponding to China's Wenchuan Earthquake of 12 May 2008 UTC (M(w) = 7.9). PCA is applied to global ionospheric maps (GIMs) with transforms conducted for the time period from 08: 00 to 10: 00 UT on 9 May 2008. The GIMs are subdivided into 100 smaller maps (36 degrees longitude and 18 degrees latitude). The smaller maps (71 x 71 pixels) form the transform matrices of corresponding dimensions (2 x 1) through image processing. The transform allows for extreme principal eigenvalues to be assigned to the seismo-ionospheric signature described by Zhao et al. [2008, Is an unusual large enhancement of ionospheric electron density linked with the 2008 great Wenchuan earthquake? Journal of Geophysical Research, 113, A11304, doi: 10.1029/2008JA013613.]. Results show that the range of the TEC anomaly declines with height; however, the anomaly becomes more localized and intense at higher altitudes (250-300 km), giving the anomaly the spatial pattern of a downward-facing trumpet.
    Appears in Collections:[太空及遙測研究中心] 期刊論文

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