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Variations in the fractal dimension of fluctuations of the ionospheric F2 layer critical frequency

机译：电离层F2层临界频率波动的分形维数变化

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摘要

The 40-year period of observations of short-term variations (with characteristic times of up to 1-2 days) in the critical frequency of the ionospheric F2 layer (foF2) is analyzed. The continuous (with a step of 1 h) series of fluctuations (F) of the foF2 critical frequency (with eliminated daily variations) has been calculated using the hourly variations in foF2 at Moscow stations. The fractal dimension (FRH) of the fluctuations, characterizing short-term variations in foF2, has been determined and analyzed on a 30-day interval, using the Higuchi method. It has been established that FRH estimates substantially change in time. The 11-year cycle, which is in antiphase with the solar cycle, and the total annual and semiannual variations, similar to the variations observed in the normalized critical frequency of the E region and in the electron density of the D region, are clearly defined in these changes. Thus, the parameters of fast variations in the ionospheric F2 layer are affected by the phase of the 11-year solar cycle and by the position of the Earth in the orbit or seasonal variations in the atmosphere. [PUBLICATION ABSTRACT]
机译：分析了40年的电离层F2层（foF2）临界频率短期变化（特征时间最多1-2天）的观测结果。 foF2临界频率的连续（连续1步）波动（F）（消除了每日变化）已使用莫斯科站的foF2每小时变化进行了计算。已经使用Higuchi方法在30天间隔内确定并分析了foF2短期变化的波动分形维数（FRH）。已经确定FRH估计时间会发生实质性变化。清楚地定义了与太阳周期相反的11年周期，以及总的年度和半年度变化，类似于在E区的归一化临界频率和D区电子密度中观察到的变化。在这些变化中。因此，电离层F2层快速变化的参数受11年太阳周期的相位以及地球在轨道上的位置或大气季节变化的影响。 [出版物摘要]

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