广州地磁台转换函数的长期变化和季节变化
SECULAR AND SEASONAL CHANGES IN TRANSFER FUNCTION AT GUANGZHOU GEOMAGNETIC OBSERVATORY
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摘要: 本文全面系统地研究了1960——1987年广州地磁台转换函数的变化.结果表明:(1)季节变化的特点是夏季幅度大,冬季幅度小,具有12和6个月的主要周期成份;长期变化则表现以每年0.0025的速率下降.转换函数 B 的长期变化和季节变化不明显;(2)由转换函数 A,B 求出的帕金森矢量的方向明显地受海洋的影响,反映了海洋效应;(3)转换函数 A,B 的逐月值与地磁活动相关,而年均值与地磁活动无关.A 的年均值无明显的11年或22年周期.长期变化可能主要受地球内部电性结构的影响.Abstract: Time changes in transfer functions of short period geomagnetic variations in 28 years from 1960 through 1987 are studied, systematically and in detail in this paper. The results indicate that : (1) It is evident that seasonal and secular changes in the transfer functions A at exists the Guangzhou geomagenetic observatory. The character for seasonal change are large in summer and smaller in winter with main cycles of 12 months and 6 months. The character for secular change is a descend with a rate of 0.0025 per year. The seasonal and secular changes in transfer functions B are not evident. (2)The direction of Parkinson vector at Guangzhou geomagnetic observatory is clearly affected by the ocean, and is associated with coastal effect. (3)The values of transfer functions A and B are related to geomagnetic activity at = 0.05. Secular change is not related to geomagnetic activity, maybe it is affected in a great measure by earth conductivity change.
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[1] Honkura. T——1978. Electrical conductivity anomalies in the earth. Geophysical Surveys. 3. 226——253
[2] 祁贵仲、詹志佳、侯作中、范国华、王志刚、白彤霞. 1981.渤海地区地磁短周期变化异常,地慢高导层分布及其与唐山地震的关系.中国科学,7: 869——879.
[3] Gong. S. J. 1985. Anomalous changes in transfer functions and the 1976 Tangshan EaRhquake(M、7.8),J. Genrg. Geaelectr., 37, 503——508.
[4] Sano. Y. and Nakapma. S——1982. Secular and seasonal variations of transfer functions at Kakioka from March 1977 to April 1981. Merrm Kakioko Mag Obs., 19, 33——50.
[5] Chen. P. F.,1981. A search for correlation between time change in north Taiwan. J. Gennwg. Geoelectr,33.635——643.
[6] 陈伯舫,1982.沿海台站间地磁日变形态相位差的半月周期变化.地球物理学报,25, 1. 41——49.
[7] Parkinson. W. D.,1962. The influence of continents and oceans on geomagnetic variations. Geophh.s, J. R.ustr. Soc——6. 441——449.
[8] Schmucker. U——1970. Anomalies of geomagnetic variations in the southwestern United States. Bull. Soc.slast. Oceanokr.,131——221.
[9] 龚绍京,1987.广东省地磁台的帕金森矢量及广州磁台的系数在河源地震前后的时间变化.地震研究,10, S. 575——582.
[10] Rikitake. T., 1976. Crustal dilatancy and geomagnetic variations of short period. J. Geurrerg. Geoelertr. 28,145——156.[1] Honkura. T——1978. Electrical conductivity anomalies in the earth. Geophysical Surveys. 3. 226——253
[2] 祁贵仲、詹志佳、侯作中、范国华、王志刚、白彤霞. 1981.渤海地区地磁短周期变化异常,地慢高导层分布及其与唐山地震的关系.中国科学,7: 869——879.
[3] Gong. S. J. 1985. Anomalous changes in transfer functions and the 1976 Tangshan EaRhquake(M、7.8),J. Genrg. Geaelectr., 37, 503——508.
[4] Sano. Y. and Nakapma. S——1982. Secular and seasonal variations of transfer functions at Kakioka from March 1977 to April 1981. Merrm Kakioko Mag Obs., 19, 33——50.
[5] Chen. P. F.,1981. A search for correlation between time change in north Taiwan. J. Gennwg. Geoelectr,33.635——643.
[6] 陈伯舫,1982.沿海台站间地磁日变形态相位差的半月周期变化.地球物理学报,25, 1. 41——49.
[7] Parkinson. W. D.,1962. The influence of continents and oceans on geomagnetic variations. Geophh.s, J. R.ustr. Soc——6. 441——449.
[8] Schmucker. U——1970. Anomalies of geomagnetic variations in the southwestern United States. Bull. Soc.slast. Oceanokr.,131——221.
[9] 龚绍京,1987.广东省地磁台的帕金森矢量及广州磁台的系数在河源地震前后的时间变化.地震研究,10, S. 575——582.
[10] Rikitake. T., 1976. Crustal dilatancy and geomagnetic variations of short period. J. Geurrerg. Geoelertr. 28,145——156.
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