中国地区地磁垂直分量日变幅的空间分布及高空电流体系焦点位置的移动
ON THE SPATIAL DISTRIBUTION OF THE DIURNAL VARIATION OF THE GEOMAGNETIC VERTICAL COMPONENT IN CHINA AND THE MOVEMENT OF THE FOCI OF UPPER ATMOSPHERE CURRENT SYSTEM
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摘要: 本文利用我国部分台站地磁垂直分量日变幅的资料,采用局部地区日变场的分析方法,研究了地磁垂直分量日变幅在中国地区的空间分布特征.结果表明,在局部地区地磁日变场的研究中,考虑经度影响是必要的,本文所用方法是适宜的;结果还表明,垂直分量日变幅的空间分布呈现出明显的季节变化、逐月变化及逐日变化性.若粗略地把磁静日垂直分量日变幅极大值所处的纬度视为 Sq 高空电流体系的焦点所对应的纬度,则此焦点纬度夏季最高,冬季最低,春秋季居中,并显出明显的逐月及逐日变化性,在相邻的两个静日,焦点纬度的变化可达几度.Abstract: This paper deals with the study of the spatial distribution of the amplitude of diurnal variation of geomagnetic vertical component in China, based on the data recorded at some Chinese geomagnetic stations, using the method of analysis of solar daily variation of geomagnetic field in local regions. The results show that it is necessary to take into account the longitudinal effect in local regions and that the method used here seems to be appropriate. It also shows that the spatial distribution of amplitudes of diurnal variation of the vertical component displays noticeable seasonal variation, month-to-month and day-to-day. If the latitudes of the maximum amplitudes of variation of the vertical component on geomagnetic quiet days are roughly taken as the latitudes corresponding to the foci of Sq overhead current system, we can see that these latitudes of foci become highest in summer, lowest in winter and medium height in Equinoxes, displaying conspicuously monthly and daily variations. For two successive geomagnetic quiet days the latitudes of foci may vary several degrees.
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[1] S. Chapman and Barrels, Geomagnetism, Oxford at the Clarendon Press 1940,
[2] S. Matsushita and Wallace H. Campbell, Physics of Geomagnetic Phenomena, Academu Press New York and London. 1967.
[3] A. T. Price and G. A. Wilkins, New Methods for the analysis of geomagnetic fields and their appli——cation to the Sq field of 1932——33, Phil. Tran. Roy. Soc, Londorz, A, 256, 31——98, 1963.
[4] 祁贵仲,局部地区地磁日变分析方法及中国地区Sq场的经度效应,地球物理学报,18 2, 1975
[5] M. Hasegawa. On the position of the focus of the geomagnetic current system, J. Geophyr. Ros., 65,1437——1447. 1960.
[6] S.M.扬诺夫斯基,地磁学(中译本),地质出版社,1959[1] S. Chapman and Barrels, Geomagnetism, Oxford at the Clarendon Press 1940,
[2] S. Matsushita and Wallace H. Campbell, Physics of Geomagnetic Phenomena, Academu Press New York and London. 1967.
[3] A. T. Price and G. A. Wilkins, New Methods for the analysis of geomagnetic fields and their appli——cation to the Sq field of 1932——33, Phil. Tran. Roy. Soc, Londorz, A, 256, 31——98, 1963.
[4] 祁贵仲,局部地区地磁日变分析方法及中国地区Sq场的经度效应,地球物理学报,18 2, 1975
[5] M. Hasegawa. On the position of the focus of the geomagnetic current system, J. Geophyr. Ros., 65,1437——1447. 1960.
[6] S.M.扬诺夫斯基,地磁学(中译本),地质出版社,1959
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