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Summary. In the maximum entropy spectrum analysis (MESA) of geomagnetic data, the required order can be estimated by the zero-frequency half-power width (ZHW) minimum method proposed in this paper. The spectra of the data for 1876–1975 at Zo-se showed a period of 40yr, in addition to the well-known periods. The amplitudes of the variations were estimated with parabolic-sinusoidal series fitting. 相似文献
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本文对三十年来我国地磁和高空物理学的进展,作了较系统的评述,分下列14个方面:(1)地磁台的建设,(2)地磁测量和中国地磁图,(3)地磁短期变化和磁暴预报,(4)岩石磁性、古地磁和考古地磁,(5)大地电磁勘探和有关的工作,(6)磁法勘探及推断方面的发展,(7)地磁地电仪器的研制,(8)震磁关系的探索和理论研究,(9)日地关系若干统计分析,(10)高层大气结构和臭氧层测定,(11)关于电离层的探测和分析研究,(12)磁层结构和扰动,(13)宇宙线强度变化的测定和研究,(14)简短的回顾和展望。 相似文献
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In this paper results and analysis of geomagnetic observations during previous 5 solar eclipses occurred in China are summarized. They are solar eclipses: No. 1, on 19 June 1936 in Heilongjiang of NE China; No. 2, on 21 September 1941 in Fujian; No. 3, on 19 April 1958 in Hainandao; No. 4, on 22 September 1968 in Xinjiang; and No. 5, on 16 February 1980 in Yunnan of SW China. The authors took part in the last 2 expeditions and joint programmes in the track of totality.The methods of evaluation for eclipse effects on the geomagnetic field are briefly described both for the quiet and disturbed days. The discussion of these data is made with reference to Chapman's theoretical consideration on optical eclipse effect, together with the quiet-day overhead current systems in the upper atmosphere. We conclude that optical eclipse effects are easily observable under favourable conditions, and further observations are essential to establish the yet unknown effects due to corpuscular eclipses. 相似文献
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With the aid of the Akasofu's energy coupling function between the solar wind and the magnetosphere, we have made in this paper an analysis of about 20 geomagnetic storms recorded at Beijing during the period of years 1966 to 1972. There is a close correlation between the energy coupling function ? and the geomagnetic indices ap and Kp. All in all an empirical formula as ? ~ 1?2 × 1017ap has been found for the geomagnetic storms occurred in a low latitude station, i.e. Beijing of China. Comparisons of the horizontal component Hmax (in γ) and ?(1018 erg s?1) in Table 1 indicate that the development of storm main phase at Beijing depends very much on the ? values thus involved. Also, these are well illustrated for several individual storms as mentioned in the second section of the paper. In concluding this paper some brief discussions are made and included. It is hoped that geomagnetic observations in the middle and low latitudes from our vast country should make further contributions to the study of solar wind-magnetosphere coupling, including the Akasofu's energy coupling function. 相似文献
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本文扼要介绍中美科学合作夜空气辉观测研究的成果.首先,气辉合作研制成一套四通道的气辉观测仪器,其次,在北京近郊怀柔和兴隆二台站进行观测.从1986年至1989年积累114日成功地提供我国第一批气辉观测数据.本文着重分析其中41次对绿线5577和红线6300的时间变化,进行频谱分析,探讨气辉与大气扰动(声重波)和气辉与大磁暴之间的关系.最后文末提些今后开展气辉研究意见. 相似文献
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发生于2003年10~11月许许多多日地关系重大事件,西方称为万圣节日地事件或风暴(Halloween Events 或Halloween Storms),并予以特别关注.本文综述对这次日地重大事件的国际集会讨论和公开出版的文献,在太阳爆发方面包括:(1)太阳活动区与耀斑;(2)日冕物质抛射CMEs;(3)日冕激波;(4)太阳高能粒子SFPs;(5)活动区能量与面积、耀斑大小和CME速率.在日球层与地球物理效应方面,包括:(1)日球层响应;(2)大磁暴与宇宙线磁层效应;(3)热层与电离层效应;(4)白天极光、臭氧亏损;(5)中国学者工作.期望我国在此基础上积极开展工作和取得创新. 相似文献