VHF/UHF振幅闪烁和VHF快速法拉弟旋转起伏

VHF/UHF SCINTILLATIONS AND VHF FAST FARADAY ROTATION FLUCTUATIONS AT WUCHANG

本文利用1988年9月至1989年5月在武昌(114.4°E,30.6°N)同时接收日本ETS-Ⅱ卫星(130.0°E)发出的VHF(136MHz)信标信号和苏联静止站-T卫星(99.0°E)发出的UHP(714MHz)广播电视信号时获得的观测记录,对夜间出现的双频(VHF/UHF)闪烁和VHF快速(每分钟大于5次的起伏)法拉弟旋转起伏(以下用FRF表示法拉弟旋转起伏)进行了统计分析,结果发现在临近太阳黑子最大年份观测到的双频夜间闪烁主要为急始型,呈赤道特性,且在临近二分点的月份里有最大出现率,秋季更为明显;伴随VHF振幅闪烁出现的快速FRF常与UHF振幅闪烁共存,以及产生这种现象的不规则体由西向东漂移,东-西向的漂移速度分量,在子夜前为140m/s,在子夜后为90m/s。

In this paper, a statistical analysis is made on VHF/UHF amplitude scintillations and VHF fast Faraday rotation fluctuations by the recordings of the 136 MHz beacon signal from the Japanese satellite ETS-II at 130.0°E and the 714 MHz television signal from Soviet geostationary station-T at 99.0°E obtained at Wuchang during the period September 1988 through May 1989. It is shown that nighttime scintillations appear to have an essentially equatorial nature toward the time of maximum solar activity, and the occurrence of VHF/UHF scintillations reaches its' maximum near two equinoxes. The irregularities producing these phenomena seem to drift from west to east with a speed of about 1-1 m/s in the pre-midnight hours and of about 90 m/s in the post-midnight hours.