| DC 欄位 |
值 |
語言 |
| DC.contributor | 太空科學研究所 | zh_TW |
| DC.creator | 楊智源 | zh_TW |
| DC.creator | Jhih-yung Yang | en_US |
| dc.date.accessioned | 2009-7-3T07:39:07Z | |
| dc.date.available | 2009-7-3T07:39:07Z | |
| dc.date.issued | 2009 | |
| dc.identifier.uri | http://ir.lib.ncu.edu.tw:444/thesis/view_etd.asp?URN=966203001 | |
| dc.contributor.department | 太空科學研究所 | zh_TW |
| DC.description | 國立中央大學 | zh_TW |
| DC.description | National Central University | en_US |
| dc.description.abstract | 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。
| zh_TW |
| dc.description.abstract | 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.
| en_US |
| DC.subject | 電離層 | zh_TW |
| DC.subject | 赤道異常區 | zh_TW |
| DC.subject | 電離層探測儀 | zh_TW |
| DC.subject | 福爾摩沙衛星三號 | zh_TW |
| DC.subject | Digisonde Portable Sounder | en_US |
| DC.subject | FORMOSAT-3/COSMIC | en_US |
| DC.subject | equatorial ionization anomaly | en_US |
| DC.subject | HmF2 | en_US |
| DC.subject | NmF2 | en_US |
| DC.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 | zh_TW |
| dc.language.iso | zh-TW | zh-TW |
| DC.title | Electron density profiles in the equatorial ionosphere observed by the FORMOSAT-3/COSMIC and a digisonde portable sounder at Jicamarca | en_US |
| DC.type | 博碩士論文 | zh_TW |
| DC.type | thesis | en_US |
| DC.publisher | National Central University | en_US |