BEHAVIOR OF THE IONOSPHERIC SLAB THICKNESS OVER CHINESE MID-LATITUDE REGION FOR A HALF SOLAR CYCLE
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摘要: 本文用新乡(电离层400km对下点是:32.4°N,115.6°E)、重庆(电离层400km对下点是:27.2°N,108.7°E)接收日本同步卫星ETS-Ⅱ的信标资料,研究了我国中纬地区上空半个太阳活动周期内(1981—1985)电离层等效板厚的变化特征,得到了等效板厚日变化、季变化的二维和三维等值图。由付里叶分析和回归方法得出等效板厚日变化各谐波分量与太阳黑子数12个月滑动平均值之间存在弱的线性关系。同时指出在等效板厚日变化中,于当地时0400—0700LT存在一明显的黎明峰。并对出现这种峰的原因作了讨论。Abstract: This paper deals with the variations in equivalent slab thickness of the ionosphere over Chinese mid-latitude region for a half solar cycle (1981-1985) using satellite ETS-2 radio beacon observations at Xinxiang (400km subionospheric point: 32.4°N,115.6°E) and Chongqing (400km subionospheric point;27.2°N,108.7°E).The contours and three-dimensional plots for diurnal and seasonal variations of slab thickness are obtained.The harmonic components of diurnal changes in slab thickness are given by Fourier analysis.By the method of linear regressions,a weakly linear dependence of slab thickness with 12 month running mean values of sun-spot number is also obtained.At the same time,the existence of a predawn peak in slab thickness around 0400 to 0700 LT is noted,and the mechanism causing the predawn peak in slab thickness is briefly discussed.
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