对我国地磁核旋定点观测资料质量评定的方法探讨     

林云芳  续春荣 《地震地磁观测与研究》1992,13(4):38-45

本文以地磁场时空变化的规律性为物理依据,以最小二乘法为数学工具,对我国1990年10月—1991年6月103个定点核旋观测每日北京时21点绝对值F_(21)、Z_(21)、H_(21),以及部分台站的基线值F_B、Z_B、H_B进行了考察,并提出利用区域台间地磁数据的空间线性相关和对基线值进行多项式拟合两种方法进行方差分析,以及用标准偏差作为判断观测数据质量的标准。  相似文献   

ZNC型智能磁力仪Z分量日变形态傅氏拟合误差分析     

郑江蓉 《地震地磁观测与研究》1997,18(1):42-45,54

采用傅氏拟合法对ＺＮＣ型智能磁力仪观测所得每日１４４０个数据进行低通滤波，并对滤波前后的各项结果与量图值进行了分析，结果认为：对于这种高采样率的观测数据，需要进行低通滤波后才能抽取２４个整点值及计算机自动判断极值和极值时间。  相似文献   

Precession‐induced flows in liquid‐filled containers and in the Earth's core     

M. A. Pais  J. L. Le Mouël 《Geophysical Journal International》2001,144(3):539-554

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Long and short term relationships between solar wind velocity and geomagnetic field at low latitudes     

G. K. Rangarajan 《Journal of Earth System Science》1984,93(4):343-351

Solar wind velocity control of low latitude geomagnetic field both on long and short term basis is studied. It is shown that semiannual averages of the low latitude field is inversely related to solar wind velocity and that there is a dominant local time dependence of the relationship. Strongest correlation are confined to the local afternoon hours. It is also shown that for a duration when the solar wind velocity exhibits significant recurrent pattern the low latitude geomagnetic field also depicts strong solar synodic rotation periodicity of 27 days with significant coherence with velocity. The low latitude field on a short term basis is influenced by variable solar wind velocity with a delay of about 1–2 days. During the period of systematic recurrent pattern in solar wind velocity even the quiet-time night field at equatorial and low latitudes show a strong dependence on velocity indicative of the solar wind control of the quiet-time proton belt encompassing the earth.  相似文献   

The Late Jurassic Tithonian, a greenhouse phase in the Middle Jurassic–Early Cretaceous 'cool' mode: evidence from the cyclic Adriatic Platform, Croatia     

ANTUN HUSINEC  J. FRED READ† 《Sedimentology》2007,54(2):317-337

Well‐exposed Mesozoic sections of the Bahama‐like Adriatic Platform along the Dalmatian coast (southern Croatia) reveal the detailed stacking patterns of cyclic facies within the rapidly subsiding Late Jurassic (Tithonian) shallow platform‐interior (over 750 m thick, ca 5–6 Myr duration). Facies within parasequences include dasyclad‐oncoid mudstone‐wackestone‐floatstone and skeletal‐peloid wackestone‐packstone (shallow lagoon), intraclast‐peloid packstone and grainstone (shoal), radial‐ooid grainstone (hypersaline shallow subtidal/intertidal shoals and ponds), lime mudstone (restricted lagoon), fenestral carbonates and microbial laminites (tidal flat). Parasequences in the overall transgressive Lower Tithonian sections are 1–4·5 m thick, and dominated by subtidal facies, some of which are capped by very shallow‐water grainstone‐packstone or restricted lime mudstone; laminated tidal caps become common only towards the interior of the platform. Parasequences in the regressive Upper Tithonian are dominated by peritidal facies with distinctive basal oolite units and well‐developed laminate caps. Maximum water depths of facies within parasequences (estimated from stratigraphic distance of the facies to the base of the tidal flat units capping parasequences) were generally <4 m, and facies show strongly overlapping depth ranges suggesting facies mosaics. Parasequences were formed by precessional (20 kyr) orbital forcing and form parasequence sets of 100 and 400 kyr eccentricity bundles. Parasequences are arranged in third‐order sequences that lack significant bounding disconformities, and are evident on accommodation (Fischer) plots of cumulative departure from average cycle thickness plotted against cycle number or stratigraphic position. Modelling suggests that precessional sea‐level changes were small (several metres) as were eccentricity sea‐level changes (or precessional sea‐level changes modulated by eccentricity), supporting a global, hot greenhouse climate for the Late Jurassic (Tithonian) within the overall ‘cool’ mode of the Middle Jurassic to Early Cretaceous.  相似文献   

Application of EDA technology and μClinux operating system in the earthquake precursor instruments     

Anhua He  Gang Zhao Na Xue Jun Wang Bailin Guo Miaoxi Guo  Zizhong Fu Institute of Crustal Dynamics  China Earthquake Administration  Beijing  China Earthquake Administration of Tianjin Municipality  Tianjin  China China Earthquake Networks Center  Beijing  China 《地震学报(英文版)》2009,(1):101-106

Using Altera's Quartus Ⅱ,Nios Ⅱ IDE and Sopc Builder development tools,the proton precession magne-tometer principle host hardware platform is designed in a cyclone Ⅱ series FPGA chip(EP2C35).The proton precession magnetometer principle host core circuit's single-chip system-logic design is achieved by building and configuring the Nios Ⅱ soft-core processor,developing the IO interface and sensor control circuits,programming some hardware units' VHDL code,for example the equal precision cymometer and the DPL...  相似文献   

悬挂式球形分量线圈研制简介     

居海华  冯志生  于华  夏忠  田韬 《地震》2009,29(4):139-145

基于国内外质子磁力仪分量线圈的最新进展, 综合国内外分量线圈的优缺点, 成功研制我国第一台悬挂式球形分量线圈。 该线圈具有体积小, 重量轻, 中心均匀磁场均匀度高, 分量观测值稳定性好, 均匀磁场对外辐射范围小等优点。  相似文献   

FHD-1质子矢量磁力仪观测资料失真原因分析     

邢伟伟  孙其贵  陈传华  林秀娜  贾立国 《华北地震科学》2008,26(2):60-64

泰安台的FHD-1核旋仪这几年的记录曲线总是出现一些凹凸现象,为了弄清其原因,做了一系列的分析研究,终于找出原来是仪器本身的故障造成的。  相似文献   

Black holes and rotation     

C. V. Vishveshwara 《Journal of Astrophysics and Astronomy》1999,20(3-4):103-120

In this article, we first consider briefly the basic properties of the non-rotating Schwarzschild black hole and the rotating Kerr black hole Rotational effects are then described in static and stationary spacetimes with arial symmetry by studying inertial forces, gyroscopic precession and gravi-electromagnetism. The results are applied to the black hole spacetimes.  相似文献   

太阳质子耀斑和江淮大水的关系     

周树荣  方成 《紫金山天文台台刊》2000,19(1):1-7

１９９１年５月－６月期间的日面上强质子耀斑的连续爆发,被认为是１９９１年中国江淮特大洪水的重要天文因素。太阳质子耀斑触发和加剧了极涡的冷空气南下,低空西南急流的东移和西太平洋副热带高压的西伸,北抬过程。由于冷暖湿气流在江淮地区频繁地相遇,因此形成了多次暴雨和特大暴雨过程,从而诱发了１９９１年初夏中国江淮流域的特大洪水。  相似文献