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1.
ＴｈｅｑｕａｌｉｔｙｅｘａｍｉｎａｔｉｏｎｏｆｏｂｓｅｒｖａｔｉｖｅｄａｔａａｔＧｅｏｍａｇｎｅｔｉｃｏｂｓｅｒｖａｔｏｒｉｅｓＡｎ－ＬｏｎｇＣＨＥＮＧ（程安龙），Ｊｉｎ－ＰｉｎｇＺＨＯＵ（周锦屏），Ｙｕ－ＦｅｎＧＡＯ（高玉芬）Ｘｕｅ－ＭｉｎＺＨＡＯ... 相似文献
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Introduction The occurrence of earthquake has relations not only with seismogenic process of source area,but also with the environment of inner (earth space) and outer (earth-sun space). The varyinggeomagnetic field is natural medium that connects with both factors (DING, 1988). There are two kinds of basic ideas using the diurnal-variation anomalies of the verti-cal-component (Z) in geomagnetic field to predict earthquake. The first kind is local geomagneticanomalies that are obta… 相似文献
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Feygin F. Z. Kleimenova N. G. Khabazin Yu. G. Malysheva L. M. 《Geomagnetism and Aeronomy》2019,59(3):296-303
Geomagnetism and Aeronomy - The results of analysis an unusual event in the frequency range of Pc1 geomagnetic pulsations discovered at the end of solar cycle 24 are presented. This event was... 相似文献
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The present study revisits the Carrington’s storm using the observations of geomagnetic declination (D) made in the meteorological observatory of Guatemala approximately during the 2 years preceding the storm. The available monthly data for absolute values (diurnal variation) cover the period that spans between May (April) 1857 and December 1859. The analysis of the temporal evolution of monthly means confirmed its overall good quality. Additionally, highly relevant quasi-hourly declination data was analysed for the 2 stormy days of 28 August and 2 September 1859, including complementary information on the auroral sightings on those days. The quasi-hourly data shows that an extremely large deviation (18′) of the geomagnetic declination occurred at 12–13 h (UT) on the 2 September 1859. The comparison of this disturbance with the maximum hourly variations of D recorded at other low-latitude stations during more recent major geomagnetic storms shows the reliability of the Guatemala data. Furthermore, it provides an additional confirmation of the global scale of the great Carrington’s storm. 相似文献
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Peng Chunyi Ji Caijian Yang Xinping Chen Yang and Zheng JiangrongSeismological Bureau of Jiangsu Province Nanjing China 《中国地震研究》1995,(1)
The total intensity of geomagnetic field(F)and its vertical component(Z)have been observed and tested for 14 years since 1979 in Jiangsu area.During the period 3 values,including the vertical component Z on 21h,the amplitude of diurnal variations of Z and the complex geomagnetic effects of "lowest-point displacement,have been obtained from 6 earthquakes with Ms≥4.6.These observations show that the geomagnetic complex anomalous variations do not appear when no moderately strong earthquakes occurs in this area.In this paper,the authors consider that it is possible to improve the results and actions of geomagnetic method for earthquake prediction with more intensive continuous recordings and geomagnetic multiparameter network by observing the vertical value Z,a main parameter to obtain geomagnetic anomaly in the middle-low latitude region. 相似文献
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Formation mechanism of the spring–autumn asymmetry of the F2-layer peak electron number density of the midlatitudinal ionosphere, NmF2, under daytime quiet geomagnetic conditions at low solar activity are studied. We used the ionospheric parameters measured by the ionosonde and incoherent scatter radar at Millstone Hill on March 3, 2007, March 29, 2007, September 12, 2007, and September 18, 1984. The altitudinal profiles of the electron density and temperature were calculated for the studied conditions using a one-dimensional, nonstationary, ionosphere–plasmasphere theoretical model for middle geomagnetic latitudes. The study has shown that there are two main factors contributing to the formation of the observed spring–autumn asymmetry of NmF2: first, the spring–autumn variations of the plasma drift along the geomagnetic field due to the corresponding variations in the components of the neutral wind velocity, and, second, the difference between the composition of the neutral atmosphere under the spring and autumn conditions at the same values of the universal time and the ionospheric F2-layer peak altitude. The seasonal variations of the rate of O+(4S) ion production, which are associated with chemical reactions with the participation of the electronically excited ions of atomic oxygen, does not significantly affect the studied NmF2 asymmetry. The difference in the degree of influence of O+(4S) ion reactions with vibrationally excited N2 and O2 on NmF2 under spring and autumn conditions does not significantly change the spring–autumn asymmetry of NmF2. 相似文献
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Geomagnetism and Aeronomy - Abstract—The ERDA and IGRF-12 geomagnetic field models are used to study the behavior of Earth’s large-scale magnetic field. The unusualness of the modern... 相似文献
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Summary A possible relation between the 10-day, 1-month, and 2-month geomagnetic as well as solar activity, characterized by Kp and Wolf's number R, and temperatures measured at the Prague-Klementinum meteorological station in January–February of the years 1932–1987 was sought. It was found that:1) Kp correlates with the temperature in Prague better than Wolf's number R.2) If the QBO phase is taken into account, the correlations improve.3) Even if the correlations improves with increasing length of the subintervals into which the individual winter periods (January-February) were derived, their statistical significance declines. 相似文献
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TianShan GuanHuaping WuGuoyou LiuYunxiu 《中国地震研究》2004,18(3):271-280
The earth resistivity and geomagnetic observation data of the Z component from many stations in near-epicentral areas of strong earthquakes are combined and calculated by using a spatial linearity method and a new characteristic value, the spatial linearity a, describing the precursory field in near-epicentral area of strong earthquake, is obtained. The analysis and calculation results of geoelectric and geomagnetic observation data prior to 8 earthquakes with M≥5.5 occurring in the North China region show that a value near the epicentral area tendsto decrease significantly half a year before strong earthquakes. 相似文献
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Izvestiya, Physics of the Solid Earth - Abstract—The intensification of geomagnetic variations due to a number of strong remote earthquakes is studied using a chain of ground-based... 相似文献
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Geomagnetism and Aeronomy - Modern geodynamo models allow the generation of a magnetic field without reversals and with frequent reversals. The transition from one regime to another is associated... 相似文献
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Metelkin D. V. Lavrenchuk A. V. Mikhaltsov N. E. 《Izvestiya Physics of the Solid Earth》2019,55(6):833-840
Izvestiya, Physics of the Solid Earth - The possibility of reconstructing geologic events by identifying patterns in variations of the geomagnetic field related to reversals is one of the... 相似文献
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This paper analyzes two types of power supply interference encountered in the observation of geomagnetic second data:the HVDC interference and the discharge interference of electrified railway. By taking the FGM fluxgate magnetometer of Changli Seismic Station as the research object, we analyze interference characteristics and conduct intensive observational experiment of electrified railway interference. Finally, several conclusions are obtained:① HVDC interference is closely related to the changes in the current system of the interference source, such as current size, distance or orientation of the interference source. Although the characteristics of each change are not the same, the main changes are variable. ② The discharge phenomenon caused by the contact of the pantograph system or other reasons during the operation of the electrified railway is a factor that may cause random small interference in the geomagnetic second data at Changli Seismic Station. This study explains similar phenomena discovered in previous years and meanwhile correct previous misjudgments including unstable working systems, unstable power supply, and occasional sudden jumps that are considered to be discrete. 相似文献
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Nachasova I. E. Pilipenko O. V. Markov G. P. Nedomolkina N. G. 《Izvestiya Physics of the Solid Earth》2020,56(2):238-248
Izvestiya, Physics of the Solid Earth - Abstract—The archaeomagnetic study of ceramic material from Veksa III archaeological site (φ = 59°17′ N, λ = 40°10′ E)... 相似文献
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ＧｅｏｍａｇｎｅｔｉｃｓｏｌａｒｆｌａｒｅｅｆｆｅｃｔｏｎＦｅｂｒｕａｒｙ４ａｎｄ６，１９８６ａｔｔｈｅｃｈｉｎａＡｎｔａｒｃｔｉｃＧｒｅａｔｗａｌｌＳｔａｔｉｏｎＸｉａｏ－ＰｉｎｇＺＥＮＧａｎｄＹｕｎ－ＦａｎｇＬＩＮ（曾小苹，林云芳）（Ｉｎｓｔｉｔ... 相似文献
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INTRODUCTIONStrongearthquakeactivityrepresentsalarge scalecrustaltectonicmovementprocess .Intheprocessofearthquakepreparation ,thedistributionofthegeophysicalparametersintheearthquakepreparationareahasthecharacteroftemporalcontinuityandspatialdependencewithdifferentgeologicalstructures ,andhenceaseismicprecursoryfieldisformed .Affectedbythetectonicstressfieldandthestressfieldinthefocalarea ,theearthresistivityinthesourceanditssurroundingareaswillchangeintheprocessofearthquakepreparation .… 相似文献
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Kleimenova N. G. Manninen J. Gromova L. I. Gromov S. V. Turunen T. 《Geomagnetism and Aeronomy》2019,59(3):272-280
Geomagnetism and Aeronomy - We have studied the geomagnetic conditions during the occurrence of auroral-hiss VLF emissions on the Earth’s surface in the form of noise bursts at frequencies... 相似文献
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On the Geomagnetic Variations Observed on the Earth’s Surface in the Period Range of Planetary Waves
Izvestiya, Physics of the Solid Earth - Abstract—The spectra of geomagnetic variations calculated in the period range close to planetary waves—5, 10, and 16 days—are analyzed. The... 相似文献
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Kleimenova N. G. Gromova L. I. Gromov S. V. Malysheva L. M. 《Geomagnetism and Aeronomy》2019,59(6):660-667
Geomagnetism and Aeronomy - The features of daytime high latitude geomagnetic disturbances and geomagnetic pulsations during the recent strong magnetic storm on August 25–26, 2018, which... 相似文献