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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/5268


    Title: 赤道地區日落後垂直上昇速度與不規則體發生的相關性研究
    Authors: 何書安;Shu-an He
    Contributors: 太空科學研究所
    Keywords: 不規則體;垂直上昇速度;irregularity;vertical drifts
    Date: 2007-11-23
    Issue Date: 2009-09-22 09:48:25 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 在赤道地區日落後電離層F 層,因為突增的東向電場(Eastward Electric Field),造成垂直上昇漂移速度(Vertical Drifts)的增大,使得電離層F 層向上抬升,讓不規則體產生的機率提高。 我們利用中華衛星一號上的電離層電漿電動效應儀(IPEI)所量測 到的離子資訊,從2000 年2 月份到2004 年1 月份,取出K p<3 的資料,分成3 個當地時段(Local Time) ,在赤道地區對日落後的不規則體發生的機率特性,隨著經度、當地時間以及季節的變化,與其相對應的垂直上昇速度作一系列的相關性研究。觀測結果發現,在日落後其當地時段(18 LT ~19 LT)的垂直上昇漂移速度突增,與不規則體的產生有很大的相關性;而且磁偏角會影響到四個季節的垂直上昇漂移速度的變化,所以也會造成在其相對應的季節有不同的不規則體的產升機率。 Large vertical drifts driven by eastward electrical fields appear in the post-sunset equatorial F region. These enhanced vertical drifts drive the ionospheric F region to high altitude and results in many scintillation-producing irregularities from February 2000 to January 2004.We also use the ROCSAT-Ι data to obtain vertical drifts in three separate 16:00~19:00 local time regions when the geomagnetic Kp index is smaller than 3. The correlation of the post-sunset equatorial irregularity occurrences and the vertical drifts is studied with different of LT regions,geographic longitudes,and seasons. From our study,we found that the vertical drifts increase rapidly at the post-sunset of 18LT~19LT and have a good correlation with vertical drifts. Furthermore,we found the magnetic declination affects the vertical drifts ,and it leads to a better correlation with the irregularity occurrence with the vertical drifts for all seasons.
    Appears in Collections:[太空科學研究所 ] 博碩士論文

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