共查询到20条相似文献，搜索用时 31 毫秒
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汶川地震与电磁扰动现象 总被引：2，自引：0，他引：2
地震发生的实质,是地球内部能量聚积和释放的过程。这些能量其中包括了电场能和磁场能。根据这一原理,郑州晶微电子科技有限公司自行研制了井下安装的电磁扰动监测仪,并获得了满意的效果。 相似文献
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Karpov M. I. Karpov I. V. Borchevkina O. P. Yakimova G. A. Korenkova N. A. 《Geomagnetism and Aeronomy》2020,60(5):611-618
Geomagnetism and Aeronomy - Ionospheric disturbances during meteorological storms in the Kaliningrad region with a wind amplification of 8 points or higher on the Beaufort scale for the period... 相似文献
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--A large part of the rainfall over India during the summer monsoon season (June-September) is contributed by synoptic scale disturbances such as monsoon depressions. To study the evolution of such disturbances in Atmospheric General Circulation Models (AGCM), the Hadley Centre AGCM (HadAM2b) has been integrated for 15 summer monsoons (1979-1993) and the output was examined for the presence of synoptic scale disturbances such as monsoon depressions, low pressure areas, land lows and land depressions over the Indian summer monsoon region. The atmospheric initial condition for each of these integrations was of 23rd May and observed Sea Surface Temperatures (SST) were described as a boundary condition.¶Although the horizontal resolution of the AGCM used in this study is only 2.5° 2 3.75° lat. long., the model is able to simulate a few monsoon disturbances. The important features of these simulated disturbances are presented. The features of the simulated disturbances are realistic. The morphologies of a well simulated monsoon depression and a simulated low pressure area are presented as examples. The frequency of the simulated monsoon depressions is less than the climatological frequency of the depressions during all four monsoon months. 相似文献
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Sasadhar De 《Pure and Applied Geophysics》1971,90(1):23-29
Summary This paper deals with the propagation of waves when a blast pulse is produced inside the surface of a cylindrical cavity of circular cross-section in an infinite homogeneous elastic solid of cylindrically-aeolotropic material. 相似文献
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Prof. S. K. Chakraborty 《Pure and Applied Geophysics》1956,35(1):25-32
Summary Disturbances generated by pressure on the surface of a spherical cavity inside (i) a dispersive medium, (ii) a medium having transverse isotropy about the radius vector have been considered. Finally, a brief discussion of the propagation of waves in visco-elastic media has been added.I wish to express my gratefulness to Professor B. B.Sen, for his kind help in the preparation of the paper. 相似文献
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Izvestiya, Physics of the Solid Earth - Abstract—A mechanism responsible for the transformation of energy of geomagnetic disturbances into the energy of chemically active products is... 相似文献
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利用中国大陆陆态观测网(CMONOC)的下关、 昆明和庐州GPS台站, 对汶川地震引起的同震电离层扰动(CID)进行研究。 通过对GPS原始观测数据进行处理证实汶川地震存在5个明显的同震电离层扰动(CID)现象。 根据GPS TEC时间序列和走时, 得到在电离层高度CID的水平传播速度为1.1 km/s, 属于震中区地表抬升引起的声波在电离层中传播速度; 同时, 也得到次一级CID传播速度接近0.7 km/s, 认为可能是重力波。 在此基础上, 利用射线追踪模型寻找震中位置发现, 当CID水平传播速度为1000 m/s时, 发震时刻对应的标准偏差能达到最小值19.55 s, 相应的CID起源位置是30.8°N, 103.15°E, 距离实际震中西南方向33.6 km。 相似文献
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随着全球工业化进程的大力推进,高压输电系统逐渐成为电磁环境监测的主要人为干扰源之一。本文总结了以法国DEMETER卫星电磁场数据为主开展的高压电力线辐射研究的最新成果,对电力线产生的各类空间电磁扰动现象及其时空分布特征进行了归纳分析,其中包括电力线谐振辐射(PLHR)、磁层线辐射(MLR)、ELF/VLF辐射、高能粒子沉降等,并对与其耦合机制相关的电磁波传播及波粒相互作用模型进行了总结讨论,旨在对中国电磁监测试验卫星(CSES-1)数据处理方法、干扰识别和地震弱信号提取分析提供更多的参考信息。 相似文献
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N. V. Isaev V. M. Kostin G. G. Belyaev O. Ya. Ovcharenko E. P. Trushkina 《Geomagnetism and Aeronomy》2010,50(2):243-255
The measurements on board the Cosmos-1809 satellite of various parameters of the topside ionosphere plasma during more than
ten typhoons in various regions are analyzed. It is shown that specific zones of increased pressure of the electron gas, electric
field, and intense ion oscillations are formed during the intensification stage. In some cases the “typhoon eye” is formed
over the tropical depression zone in the ionosphere, that is, the region with sharply decreased plasma density and pressure
is observed a day and more prior to the moment when it happens in the atmosphere. 相似文献
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The results of studying the ionospheric response to solar flares, obtained from the data of the GPS signal observations and incoherent scatter radars and as a result of the model calculations, are presented. It is shown that, according to the GPS data, a flare can cause a decrease in the electron content at altitudes of the topside ionosphere (h > 300 km). Similar effects of formation of a negative disturbance in the ionospheric F region were also observed during the solar flares of May 21 and 23, 1967, with the Arecibo incoherent scatter radar. The mechanism by which negative disturbances appear in the topside ionosphere during solar flares has been studied in this work based on the theoretical model of the ionosphere-plasmasphere coupling. It has been indicated that the formation of the electron density negative disturbance in the topside ionosphere is caused by an intense removal of O+ ions into the overlying plasmasphere under the action of an abrupt increase in the ion production rate and thermal expansion of the ionospheric plasma. 相似文献
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N. G. Mookerjee 《Pure and Applied Geophysics》1971,92(1):19-25
Summary The Electro-Magnetic equations of Maxwell, the equation of mechanical motion and the equation of heat flow have been used to solve the one-dimensional problem of Magneto-Thermo-Elastic Disturbances in a semi-infinite bar of variable cross section. 相似文献
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地震电磁卫星电离层扰动研究进展综述 总被引：2，自引：0，他引：2
本文总结了国内外关于地震电离层扰动现象研究的主要进展, 主要介绍了法国DEMETER卫星及其相关的统计研究和震例研究成果, 总结了目前地震电离层扰动前兆震例研究的一般步骤, 介绍了地震孕育过程中产生的电磁异常信息向电离层传播的可能途径, 包括化学途径、 声学途径和电磁途径。 大量的研究成果表明地震电离层异常的存在, 在地震发生前几个小时至几天或几个月电离层扰动被探测到, 但是地震电离层扰动前兆能否作为地震预报方法, 还有许多需要深入研究的问题。 本文提出了地震电离层研究需要解决的几个重要问题。 相似文献
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Nisong Pei Wu Yong Su Rui Li Jianfeng Wang Yongqian Li Xueling Wu Zhenghao 《Geomagnetism and Aeronomy》2021,61(4):632-646
Geomagnetism and Aeronomy - To explore the global-scale coupling characteristics between ionospheric disturbances and geomagnetic storms, and research the near-Earth space environment, the time... 相似文献
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S. Asenovski 《Geomagnetism and Aeronomy》2017,57(8):973-977
The heliospheric current sheet (HCS) is modified by the solar activity. HCS is highly inclined during solar maximum and almost confined with the solar equatorial plane during solar minimum. Close to the HCS solar wind parameters as proton temperature, flow speed, proton density, etc. differ compared to the region far from the HCS. The Earth’s magnetic dipole field crosses HCS several times each month. Considering interplanetary coronal mass ejections (ICME) and high speed solar wind streams (HSS) free periods an investigation of the HCS influence on the geomagnetic field disturbances is presented. The results show a drop of the Dst index and a rise of the AE index at the time of the HCS crossings and also that the behavior of these indices does not depend on the magnetic polarity. 相似文献
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不同水动力扰动下太湖沉积物的悬浮特征 总被引：10，自引：2，他引：8
利用2002年7月及2003年4月分别在太湖乌龟山和梅梁湾的水动力观测资料,计算了波浪和湖流产生的湖底切应力,分析了二者对太湖沉积物悬浮的不同贡献.结果发现,在小扰动情况下,流切应力大于波切应力,但不能引起沉积物的悬浮;在强扰动情况下,底流对沉积物悬浮的影响可以忽略,且扰动越强,其作用越小,而波浪的影响却愈加突出;在中等扰动下,二者的相互作用产生沉积物的悬浮,但波浪的作用较为显著.该结论能为计算太湖水体悬浮物浓度和动态内源释放提供重要的参考依据. 相似文献
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S. K. Chakraborty 《Pure and Applied Geophysics》1956,33(1):9-16
Summary The paper deals with the investigations of disturbances in an infinite homogeneous isotropic and perfectly elastic medium
produced by a source operating on a small portion of the inner surface of a cylindrical hole.
Prof.S. K. Chakraborty, M. Sc., Surendranath College, 24 Harrison Road,Calcutta-9, India. 相似文献
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Manifestations of ionospheric disturbances at heights from 120 km to the height h
m of the F2-layer maximum are analyzed. The geomagnetic disturbances on April 5, 12, and 13, 2005, are considered. These disturbances
are characterized by a pronounced synchronous decrease in the electron concentration over the entire indicated height range.
Using the method proposed by the authors, the noontime changes in the relative content of atomic and molecular oxygen at a
height of 120 km are estimated. There are a distinct decrease in the ratio of atomic oxygen and molecular nitrogen concentrations
and an increase in the ratio of oxygen molecule and atom concentrations. 相似文献
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Geomagnetism and Aeronomy - The paper presents the results of numerical modeling of the ionospheric disturbances from spatially localized, midlatitude, thermospheric sources that simulate the... 相似文献