- 作者: 高士達
- 作者服務機構: 私立輔仁大學物理系
- 中文摘要: 日落後,在赤道區的電離層會產生大量電漿空乏區域,通常被稱為氣泡。這些氣泡可上升至1000公里的高度並且造成以地磁赤道為中心兩旁相當寬帶緯度內無線電訊號嚴重地消失。我們試圖發展一套利用近地磁赤道(馬尼拉)觀測站所得到的總電子量(TEC)來決定-稱為最低值(BYT)的變數之值以辨認氣泡的形成與否。此一變數與遠在馬尼拉北方1160公里的崙坪觀測站所測得的無線電嚴重消失(閃爍現象)有著極高度的關聯性(就統計的立場而言),並有證據顯示以最低值可測得赤道區的氣泡。如果這是真的,這將可提供一有價值的研究工具,因為氣泡伴隨著閃爍現象將會影響無線電通訊及所有應用在低緯度透過電離層傳送的電波。
- 英文摘要: Large plasma depletions, usually called bubbles, form in the post-sunset equatorial ionosphere.These can rise to heights of over 1000 km.and produce severe fading effects of radio signals over a bandof latitudes centered on the dip equator. An attempt is made to develop a method of identifying bubbleformation in TEC data from a station relatively close to the dip equator (Manila) by determining the valueof a variable called BYT. This variable yields highly significant correlations (in the statistical sense) withsevere fading (scintillations) of the radio signal from a synchronous satellite received at a station in Taiwan(Lunping), 1160 km. to the north of Manila. There is evidence that BYT actually detects equatorial bub-bles. If this is true, it can provide a valuable research tool, since bubble-associated scintillations affect radiocommunications as well as all applications in which radio waves are sent through the ionosphere at lowlatitudes.
- 中文關鍵字: bubbles; equatorial ionosphere; electron content; satellite; scintillation
- 英文關鍵字: --