DC 欄位 值 語言 DC.contributor 太空科學與工程研究所 zh_TW DC.creator 陳美瑜 zh_TW DC.creator Mei-Yu Chen en_US dc.date.accessioned 2023-7-27T07:39:07Z dc.date.available 2023-7-27T07:39:07Z dc.date.issued 2023 dc.identifier.uri http://ir.lib.ncu.edu.tw:444/thesis/view_etd.asp?URN=110623019 dc.contributor.department 太空科學與工程研究所 zh_TW DC.description 國立中央大學 zh_TW DC.description National Central University en_US dc.description.abstract 使用福爾摩沙衛星七號（福衛七號）TGRS酬載所提供之掩星剖線資料，觀察正負15°磁緯度附近之日間電離層之電子濃度，以研究赤道異常峰強度（電子濃度）、位置、高度及出現時間對磁偏角之響應。本研究挑選三個磁經度區域，分別代表正磁偏角（-100°至-40°，稱為D+）、負磁偏角（5°至65°，稱為D-）及零磁偏角（165°至-135°，稱為D0）。相較之下，正磁偏角區，南北半球之赤道異常強度最大、出現時間最早、位置最北、時間差最大，且最大時間差發生在六月、最小時間差發生在十二月。而其在北半球高度最高，南半球高度則最低。負磁偏角區南北半球之赤道異常出現時間最晚、時間差最小、位置較南、高度差最小，且在南半球高度最高。零磁偏角區南北半球之赤道異常強度最小、位置最南、高度差最大。而其出現時間、時間差及高度皆介於其他兩區之間。結果證實磁偏角顯著影響電離層赤道異常之強度、位置、高度及出現時間。 zh_TW dc.description.abstract Characteristics of EIA (equatorial ionization anomaly) strength, location, appearance time, and altitude are investigated by means of the ionospheric electron density profiles obtained by TGRS (Tri-GNSS Radio occultation System) onboard FORMOSAT-7/COSMIC-2 (F7/C2). The characteristics over three geomagnetic longitudinal sectors with different magnetic declinations, ＂D+＂ the most positive-declination, -100°E to -40°E geomagnetic; ＂D-＂ the most negative-declination, 5°E to 65°E geomagnetic; ＂D0＂ around zero-declination, 165°E to -135°E geomagnetic, are examined. Results among the three sectors show that in D+, the northern and southern EIA crests yield the strongest strengths, appear at the earliest time, and move toward the most northern locations while the northern (southern) one reaches the highest (lowest) altitude. In D-, the two EIA crests yield the strengths and locations in-between those in D+ and D0, exhibit the latest appearance times while the southern one reaches the highest altitude. In D0, the EIA crests exhibit the weakest strengths, and move toward the most southern locations, appear at the time in-between the two other sectors, and have the largest altitude differences. The results show that declination is an important factor to the EIA crest characteristics. en_US DC.subject 電離層 zh_TW DC.subject 赤道異常 zh_TW DC.subject 福衛七號 zh_TW DC.subject 磁偏角 zh_TW DC.subject ionosphere en_US DC.subject equatorial ionization anomaly en_US DC.subject COSMIC-2 en_US DC.subject magnetic declination en_US DC.subject F7C2 en_US DC.title 福爾摩沙衛星七號觀察電離層赤道異常之磁偏角效應 zh_TW dc.language.iso zh-TW zh-TW DC.title Magnetic Declination Effects on Equatorial Ionization Anomaly Observed by FORMOSAT-7/COSMIC-2 en_US DC.type 博碩士論文 zh_TW DC.type thesis en_US DC.publisher National Central University en_US