• 作者： 黃胤年
• 作者服務機構： 交通部電信研究所
• 中文摘要： 過去學者們在利用發自同步衛星之 VHF 標識信號之法拉第旋轉角，以觀側電離層之全電子密度時，通常都假設法拉弟因數M及衛星自轉軸與觀測站鉛垂線間所成角度α並無日變化之存在。然而由於現存同步衛星之軌道傾度均非完全零度。而此非零度之衛星軌道傾度會引起M及α之日變化，因此假設M及α各無日變化而求得之全電子密度必定含有相當程度之誤差。交通部電信研究所崙坪觀臺自1976年元月1日起利用發自 INTEL－SAT2F3同步衛星之136.44MHz標識訊號觀測電離層之全電子密度，本文係利用該臺自1976年元月1日至6月30日共計半年之觀測數據以分析由於同步衛星軌道傾度之非零性而引起之全電子密度觀測數據之可能誤差。結果發現其誤差相當大。絕對誤差之大小，日間比夜間大，春秋分季比夏季大；而相對誤差則大於20%。
• 英文摘要： In calculating TEC value from the observed Faraday rotation angle of the VHF beaconsignal transmitted from geostationary satellites, the Faraday factor M and the angle α be-tween the spin axis of the satellite and the prime vertical of the observer have been assumedto be diurnally constant by most workers. According to SPACEWARN BULLETIN, the in-clination of most geostationary satellites is non-zero. This non-zero inclination makes M andα to vary diurnally and may induce errors in observed TEC values if M and a were takento be diurnally constant as were done by most workers in the past. The error was estimatedby using TEC data obtained at Lunping observatory by receiving 136.44 MHz beacon signalfrom INTELSAT 2F3 geostationary satellite which had an inclination of about 70.
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