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    Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/107452

    Title: Whistlers Generated by Gigantic Jets: Modeling and Observations
    Other Titles: 巨大噴流產生的哨聲波: 模式及觀測
    Authors: Wang;K;Chang, S. C.;Huang, S. M.;Hsu, R. R.;Berthelier, J. J.;Onishi, T.
    Date: 2016-05-16
    Issue Date: 2016-08-18 13:41:25 (UTC+8)
    Abstract: The characteristics of whistlers generated from a gigantic jet (GJ) are modeled as well as to examine satellite observations. Modeling is based on disturbances in the electric field, as measured by NCKU ELF/VLF station, associated with a representative tree-like GJ event over typhoon Lionrock. The calculated frequency-time spectrogram shows two sequent whistlers, with the later one emitted mainly below a few kHz. Our results show that the waves are subject to greater attenuation as the frequency increases; however, a reversal occurs at lower frequencies of a few hundred Hz due to ion effects. The electric fields observed by DEMETER (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) satellite mission are then investigated based on the locations of tree-like GJ events observed by ISUAL (Imager of Sprites and Upper Atmospheric Lightning). Paired whistlers, detected right after the tree-like GJ event occurred closest to the satellite location among all examined events, with power distribution features on the frequency-time spectrogram resembling modeled two sequent whistlers, are found.
    Relation: 2016年臺灣地球科學聯合學術研討會論文集
    Appears in Collections:[Graduate Institute & Department of Aerospace Engineering] Proceeding

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