大气行星波影响低频电波吸收变化的机制

本文根据冬季中低纬低电离层中、低频（ＬＦ）电波振幅扰动与高纬平流层中大气行昨波活动密切相关的观测事实，分析研究了可能引起低电离层对ＬＦ电波吸收变化诸因素的作用后，提出了一种能较好地解释观测现象的物理机制，大气行星波可通过两种方式改变大气离化率ｑ，因而引起低电离层中电子密度Ｎ扰动，进而改变由Ｎ大小决定的电离层电波吸收值，结果导致ＬＦ电波振幅发生相应变化。文中给出了描述这一物理计算公式和某些计算结果。

MECHANISM OF EFFECTS OF ATMOSPHERIC PLANETARY WAVES ON ABSORPTION VARIATION AT LF BAND

On the basis of observed facts that disturbance of amplitude at LF obtained in mid and low latitudes related with activity of the planetary waves in high latitudes during the winter warming, a mechanism which can better explain the above observed phenomena is given. The planetary wave is a main reason in producing absorption variation of the radio wave at LF. The atmospheric ionization rate can be changed by the planetary wave through two ways, Therefore, the disturbances of the electron density in the lower ionosphere occur when there are planetary waves and lead to variation of absorption at LF radio wave band. As a result, we observed the amplitudese at LF changes with the planetary waves at high latitudes. In this paper. we give the computing formula and results.