共查询到20条相似文献，搜索用时 312 毫秒
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"磁暴基础数据库"项目组 《国际地震动态》2006,(9):9-12
本文详细介绍了“磁暴基础数据库”项目的立项背景、目标、所开展的主要工作、取得的成果、研究成果的社会效益和对该领域研究未来工作的展望。 相似文献
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Water Resources - Observation data on salinity variations in the Gulf of Taganrog during storm surges are analyzed; a mathematical model of the transport of salt water masses is described in... 相似文献
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Geomagnetism and Aeronomy - The response of strong magnetic storms in variations of the electric field of the near-ground atmosphere of the midlatitudes are studied according to data from long-term... 相似文献
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—Based on the NCMRWF analysis over the Arabian Sea, a complete energy cycle of the severe cyclonic storm that formed in the beginning of June 1994 in the east central Arabian Sea is carried out, using the in-house developed energy package. Both barotropic and baroclinic energy conversions are responsible for the maintenance of the system, however dominance of one over the other is noticed at different stages of the system at different heights. Dynamical characteristics of synoptic scale monsoon flow surrounding the cyclonic storm are also investigated. By examining the generation and dissipation terms, it is observed that both zonal and eddy components of the synoptic scale flow act as source of energy for the cyclonic storm, both in the predeveloped and developed stages. 相似文献
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Samed Inyurt 《Geomagnetism and Aeronomy》2020,60(1):131-135
Geomagnetism and Aeronomy - Variations in solar, geomagnetic, and seismic activity cause disturbance in the ionosphere that can be monitored effectively using GPS observations. Total electron... 相似文献
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Akinyemi G. A. Kolawole L. B. Dairo O. F. Willoughby A. A. Abdulrahim R. B. Rabiu A. B. 《Geomagnetism and Aeronomy》2021,61(4):647-657
Geomagnetism and Aeronomy - The total electron content (TEC) data obtained from the ground-based GPS receiver stations of the Nigerian GNSS network of stations (NIGNET) have been used in this study... 相似文献
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S. Y. Fu Q. G. Zong Z. Y. Pu C. J. Xiao A. Korth P. Daly H. Reme 《Surveys in Geophysics》2005,26(1-3):241-254
In this paper we report energetic ion behavior and its composition variations observed by the Cluster/RAPID instrument when the spacecraft was travelling in the high latitude magnetospheric boundary region on the day of the 31 March, 2001, strongest magnetic storm in the past 50 years. The Dst index reached −360 nT at about 09:00 UT. During its early recovery phase, large amounts of oxygen and helium ions were observed; the ratio of oxygen to hydrogen in the RAPID energy range reached as high as 250%, which suggests that the observed energetic particles might be of magnetospheric origin. The observations further show that enhanced energetic electron fluxes are confined in a very narrow region, while protons have occupied a larger region, and heavy ions have been observed in an even larger region. The flux of energetic electrons show a slight enhancement in a region where the magnetic field magnitude is around zero. These observed energetic ions could be quasi-trapped by the current sheet in the stagnation region of the cusp. 相似文献
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The aim of this study is to investigate tide–surge interaction in narrow channels with complex and relatively shallow topography. A high-resolution depth-integrated tidal and storm surge model has been implemented for the Tjeldsund channel which is an important sailing lane in northern Norway. A horizontal grid resolution down to 50 m is applied in order to represent the complex bottom topography and the formation of jets and small-scale eddies. Two typically storm surge events in December 2004 have been examined in detail. The tide–surge interaction is found to influence the generation of higher harmonics and the formation of eddies in the current field. In some cases, the magnitude of storm surge currents may reach the same magnitude as the tidal currents enhancing the formation of jets and eddies. 相似文献
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Gromova L. I. Kleimenova N. G. Gromov S. V. Malysheva L. M. 《Geomagnetism and Aeronomy》2020,60(5):547-558
Geomagnetism and Aeronomy - The behavior of geomagnetic disturbances during a moderate CIR storm, the most intense magnetic storm of 2009 in the solar activity minimum are considered. It is... 相似文献
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Ljiljana R. Cander 《Acta Geophysica》2016,64(2):541-566
This paper describes certain aspects of the F region storm morphology based on vertical incidence measurements at single ionosonde station Chilton (51°.60′N, 358°.70′E). The topics discussed include requirements for better understanding of the ionospheric F region morphology and its forecasting under geomagnetically quiet and disturbed conditions. A few common storms during the years of low (1996 and 1997) and high (2000 and 2001) solar activity are considered as well as the Short-Term Ionospheric Forecasting (STIF) method by using two representative examples. The merits are stressed of near-real-time use of data to provide more accurate specification of the geomagnetically disturbed ionosphere and forecast its structure few hours in advance. 相似文献
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The results of an extensive study of streamwater chemistry during stormflow events, for a montane Mediterranean area, are presented. Four groups of variables are identified as having contrasting behaviour: alkalinity and pH; nitrate and potassium; sulphate and chloride; sodium, calcium and magnesium. The results show a complex pattern of response to flow that can be broadly linked to: (1) antecedent hydrological conditions; (2) rainfall intensity; (3) supplies of water from chemically distinct areas within the catchment. However, comparisons between this study and a parallel one which examined the composition of waters within the catchment, show that it is presently impossible to quantify the relative supplies from each part of the catchment. The findings are reviewed in relation to analogous studies within a European setting and in relation to modelling initiatives. 相似文献
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M. G. Deminov A. V. Belov E. V. Nepomnyashchaya V. N. Obridko 《Geomagnetism and Aeronomy》2018,58(4):501-508
Equations of regression are derived for the intense magnetic storms of 1957?2016. They reflect the nonlinear relation between Dstmin and the effective index of geomagnetic activity Ap(τ) with a timeweighted factor τ. Based on this and on known estimations of the upper limit of the magnetic storm intensity (Dstmin =–2500 nT), the maximal possible value Ap(τ)max ~ 1000 nT is obtained. This makes it possible to obtain initial estimates of the upper limit of variations in some parameters of the thermosphere and ionosphere that are due to geomagnetic activity. It is found, in particular, that the upper limit of an increase in the thermospheric density is seven to eight times larger than for the storm in March 1989, which was the most intense for the entire space era. The maximum possible amplitude of the negative phase of the ionospheric storm in the number density of the F2-layer maximum at midlatitudes is nearly six times higher than for the March 1989 storm. The upper limit of the F2-layer rise in this phase of the ionospheric storm is also considerable. Based on qualitative analysis, it is found that the F2-layer maximum in daytime hours at midlatitudes for these limiting conditions is not pronounced and even may be unresolved in the experiment, i.e., above the F1-layer maximum, the electron number density may smoothly decrease with height up to the upper boundary of the plasmasphere. 相似文献
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Falayi E. O. Ajose A. S. Roy-Layinde T. O. Adewole A. T. 《Geomagnetism and Aeronomy》2021,61(8):1221-1233
Geomagnetism and Aeronomy - The geomagnetic disturbance associated with coronal mass ejections (CMEs) of September 8, 2017 was evaluated using the time derivatives of the horizontal geomagnetic... 相似文献
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磁暴K指数与云南地区中强震相关性统计分析 总被引：3，自引：0，他引：3
应用云南通海地磁台K≥6的磁暴数据,对云南省内M≥5．0地震发震时间关系进行统计分析发现：K≥7的大磁暴对云南省M≥5．0地震触发作用显著,且不同强度的磁暴对地震的触发作用有差异,磁暴强度增加,触发作用也增大。这一分析结果对云南地区5级以上地震发生时间的预测有一定的意义、 相似文献
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Manninen J. Kleimenova N. G. Gromova L. I. Fedorenko Yu. V. Nikitenko A. S. Lebed’ O. M. 《Geomagnetism and Aeronomy》2020,60(3):301-310
Geomagnetism and Aeronomy - This paper discusses the spectral and temporal features of the 7-h daytime VLF noise emission burst in the frequency band of 1‒10 kHz observed on the Earth’s... 相似文献