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    题名: 中華衛星一號觀測電離層電漿氣泡密度變化之統計及研究
    作者: 何旭慧;Xu-Huan He
    贡献者: 太空科學研究所
    关键词: 中華衛星一號;電離層電漿電動效應酬載儀;bubbles;IPEI
    日期: 2001-06-29
    上传时间: 2009-09-22 09:45:15 (UTC+8)
    出版者: 國立中央大學圖書館
    摘要: 利用中華衛星一號上之電離層電漿電動效應酬載儀(IPEI)所量測到高解析度的密度資料,統計分析bubbles的發生機率隨季節、地理位置及地磁擾動的變化情形。當地磁擾動小時,在傍晚20點為bubbles發生的最佳時機,而在地磁擾動大時,午夜之後較容易有bubbles的發生。由2000年一整年的資料看出bubbles最容易在地理經度0度附近發生,而夏天時在太平洋地區(地理經度120度到150度)、冬天時在南美洲(地理經度-60度到-30度,偏向南半球)最容易產生bubbles。此外,地磁擾動小的狀況下,在當地時間18點到20點,不同尺度的波譜指數會隨著時間改變。而在地磁擾動大的狀況下,波譜指數在當地時間凌晨3點到6點有明顯的變化。 Gathered during the year 2000 from the ion trop sensor on the ROCSAT-1, a satellite in a circular orbit at the height of 600km, the high resolution ion density data in the equatorial spread F (ESF) events are analyzed in the thesis. The occurrence distributions of the plasma bubbles with seasons, locations, and magnetic activities have been obtained. During quite times, the ESF events are most likely to occur around 2000 LT. With the increase in magnetic activity, the plasma bubbles appear frequently from midnight to sunrise. The probability of the plasma bubbles occurrence is always high near 0 longitude all year long. The seasonal occurrence is such that it is high in the pacific regions (between 120 and 150 longitude) during northern summer and in the south of America (between -60 - -30 longitude) during northern winter. The result of the spectra analysis for the ESF events, indicate that the spectral index in three scales ranges changes as function as local time during 1800-2000 LT under the condition Kp 3+, and during 0300-0600 LT in the strong geomagnetic activities (Kp 4-).
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