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頁籤選單縮合
題名 | A Method of Measuring TEC at Low Elevation Angles=低仰角測量電離層總電子密度的方法 |
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作者姓名(中文) | 葉豐榮; 林根煌; 葉公節; | 書刊名 | Terrestrial, Atmospheric and Oceanic Sciences |
卷期 | 6:2 1995.06[民84.06] |
頁次 | 頁337-346 |
分類號 | 353.1 |
關鍵詞 | 低仰角測量; 電離層; 總電子密度; TEC; Radio beacon experiment; Dispersive doppler; Phase difference measurement; |
語文 | 英文(English) |
英文摘要 | A radio wave may suffer sever refractional effects at low elevations. Such effects will make the determination of the total electron content (TEC) inaccurate. Recently developed tomography techniques applied to ionospheric imaging would require accurate TEC measurements from overhead to the lowest possible elevation for a good reconstruction. It is, therefore, desirable to develop a method that will give accurate TEC measurements even at low elevation angles. One method that uses the difference of the TEC measured at two lower frequencies as a correction of the TEC measured at a higher frequency is proposed. The model study here shows the corrected TEC has a three-digit accuracy for all elevations. At low elevations the troposphere may also influence the radio path. The attempt here to extract the tropospheric information from the phase data shows only a moderate success for the atmospheric models studied. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。