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arXiv physics/0012006physics.geo-ph
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基于全球GPS网络数据的电离层扰动谱的地磁控制

Geomagnetic control of the spectrum of traveling ionospheric disturbances based on data from a global GPS network

E. L. Afraimovich, E. A. Kosogorov, O. S. Lesyuta, I. I. Ushakov, A. F. Yakovets

摘要:

本文试图验证地磁扰动是决定电离层行波扰动强度的一个因素的假说。为了提高数据的统计有效性,我们使用了新的GLOBDET技术方法的基础上,涉及全球空间平均的总电子含量(TEC)的干扰谱。为了定量表征TID强度,我们建议应使用一个新的全球扰动程度指数,它等于在选定的光谱周期范围内(在本例中为20-60分钟)TEC均方根变化的平均值。结果表明,在安静条件下,白天TEC变化的功率谱在20-60 min周期内呈幂律形式,斜率指数k =-2.5。随着磁扰动强度的增加,TIDs的总强度增加,在20-60 min范围内,振荡强度增加,导致谱的扭折。结果表明,随着地磁活动强度的增加,TEC的总强度增加;然而,它不与Dst的绝对水平相关,而是与Dst的时间导数值相关(最大相关系数达到-0.94)。TID响应的2小时量级的延迟与TID产生于极光区并以约300-400 m/s的速度向赤道传播的观点一致。

英文摘要:

In this paper an attempt is made to verify the hypothesis on the role of geomagnetic disturbances as a factor determining the intensity of traveling ionospheric disturbances (TIDs). To improve the statistical validity of the data, we have used the based on the new GLOBDET technology method involving a global spatial averaging of disturbance spectra of the total electron content (TEC). To characterize the TID intensity quantitatively, we suggest that a new global index of the degree of disturbance should be used, which is equal to the mean value of the rms variations in TEC within the selected range of spectral periods (of 20-60 min in the present case). It was found that power spectra of daytime TEC variations in the range of 20-60 min periods under quiet conditions have a power-law form, with the slope index k = -2.5. With an increase of the level of magnetic disturbance, there is an increase in total intensity of TIDs, with a concurrent kink of the spectrum caused by an increase in oscillation intensity in the range of 20-60 min. It was found that an increase in the level of geomagnetic activity is accompanied by an increase in total intensity of TEC; however, it correlates not with the absolute level of Dst, but with the value of the time derivative of Dst (a maximum correlation coefficient reaches -0.94). The delay of the TID response of the order of 2 hours is consistent with the view that TIDs are generated in auroral regions, and propagate equatorward with the velocity of about 300-400 m/s.

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