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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/5294


    Title: 利用福爾摩沙衛星三號與電離層探測儀觀測磁赤道電離層;Electron density profiles in the equatorial ionosphere observed by the FORMOSAT-3/COSMIC and a digisonde portable sounder at Jicamarca
    Authors: 楊智源;Jhih-yung Yang
    Contributors: 太空科學研究所
    Keywords: 電離層;赤道異常區;電離層探測儀;福爾摩沙衛星三號;Digisonde Portable Sounder;FORMOSAT-3/COSMIC;equatorial ionization anomaly;HmF2;NmF2
    Date: 2009-06-03
    Issue Date: 2009-09-22 09:48:58 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 利用福爾摩沙衛星三號(FORMOSAT-3/COSMIC)全球定位系統掩星觀測實驗(GPS Occultation eXperiment, GOX)用來觀測電離層電子濃度垂直分佈。本論文相互比較2007年磁赤道地區Jicamarca地面電離層探測儀和同地點福衛三號資料。首先,制定一套篩選流程挑選探測儀上空具有物理意義的福衛三號資料,例如:F2層層峰高度HmF2須在200公里高以上。分析比較此兩觀測資料的電離層HmF2和峰值濃度NmF2之日、季、年差異。獲知福衛三號大多低估兩參數,而兩者差異亦會受到背景電子濃度季節變化的影響。NmF2比較顯示福衛三號在白天可能受赤道電子濃度異常區(equatorial ionization anomaly)的影響而產生高估之現象,尤其於當地時間下午14:00LT前後時段至為明顯。 The FORMOSAT-3/COSMIC (F3/C) program applies the radio occultation technique to derive the electron density profiles, using the GPS occultation experiment (GOX) onboard the F3/C. In this study, we examine the ionospheric data concurrently observed by the F3/C and Digisonde Portable Sounder (DPS) at Jicamarca (12°S, 283°W, 1°N geomagnetic) in 2007. First, we use the criteria to choose the F3/C data that have the physics meanings (For example: the F3/C F2-peak height, HmF2, must be higher than 200KM). Then, we compare the F2-peak density (NmF2) and HmF2 of F3/C with those of Jicamarca DPS in different time periods. Results show that the F3/C generally underestimates the values of NmF2 and HmF2. The underestimates are mainly affected by the seasonal variation in the horizontal electron density. On the other hand, the F3/C overestimates the NmF2 in the afternoon period, especially at about 14:00LT. The greater electron density at the equatorial ionization anomaly accounts for the overestimate.
    Appears in Collections:[太空科學研究所 ] 博碩士論文

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