太阳日变化的特征：基于巴西Vassouras地面磁观测站记录的个例研究
Characteristics of solar diurnal variations: a case study based on records from the ground magnetic observatory at Vassouras, Brazil
摘要：
利用INTERMAGNET网络地面观测站记录的磁图水平分量振幅，分析了太阳日变化的全球型方差。这些类型的数据在记录中存在间隙，因此我们通过时频间隙小波算法对其进行探索。提出了一种基于尺度相关的磁图分析方法。结果表明，磁记录具有纬度依赖性，受季节和太阳活动水平的影响。我们已经发现了在南半球和北半球的纬度响应在夏至，这是预期由于不对称的Sq字段的差异。另一方面，在春分点，位于大致相同纬度但不同纬度的台站的记录呈现出特殊的差异。所取得的结果表明，安静的一天模式和参与其形成的物理过程受到强烈影响：E区的导电性，地磁场强度及其配置，和热层风。
英文摘要：
The horizontal component amplitudes of magnetograms recorded by ground-based observatories of the INTERMAGNET network have been used to analyze the global pattern variance of the solar diurnal variations. Those kinds of data present gaps in records and consequently we explore them via a time-frequency gapped wavelet algorithm. We propose a new approach to analyze magnetograms based on scale correlation. The results show that the magnetic records have a latitudinal dependence affected by the season of year and by the level of solar activity. We have found a disparity on the latitudinal response at Southern and Northern Hemispheres during solstices, which is expected due to the asymmetry of the Sq field. On the other hand at equinoxes, records from stations located at approximately the same latitude but at different longitudes presented peculiar dissimilarities. The achieved results suggest that quiet day patterns and the physical processes involved in their formation are strongly affected by: the conductivity of the E-region, the geomagnetic field intensity and its configuration, and the thermospheric winds.
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