本文選題：Sq等效電流體系 + 球諧分析　； 參考：《中國地震局地震預(yù)測研究所》2015年碩士論文

【摘要】：中國大陸由于到受太平洋板塊、印度板塊和菲律賓海板塊的擠壓,地震斷裂帶十分活躍。頻繁發(fā)生的地震給人民的生命、財產(chǎn)安全及國家經(jīng)濟(jì)的發(fā)展帶來了巨大的災(zāi)難和損失。大量的觀測資料表明,地震電磁輻射在地震的監(jiān)測預(yù)報中起著重要的作用,利用電磁衛(wèi)星觀測技術(shù)提取地震異常現(xiàn)象也越來越受到國內(nèi)外學(xué)者的關(guān)注。為建立地震立體監(jiān)測系統(tǒng),中國也啟動了地震電磁衛(wèi)星計劃,預(yù)計于2016年發(fā)射運行。電離層是地球高層大氣中被部分電離的區(qū)域,磁層位于電離層上方,其內(nèi)的大氣被全部電離。磁層-電離層在受太陽活動影響的同時還受到了地球本體及其低層大氣的影響,具有復(fù)雜的物理化學(xué)耦合過程。高動態(tài)、多尺度及特殊的空間環(huán)境使得磁層-電離層電流體系的研究有著極大的復(fù)雜性,利用磁層-電離層電流體系研究地震異常信號目前還處于探索階段。本文基于前人研究基礎(chǔ)利用球諧分析原理構(gòu)建內(nèi)、外源Sq等效電流體系反演模型,并將其反演結(jié)果與F10.7cm太陽射電通量、地磁活動指數(shù)Dst進(jìn)行對比分析,之后選取震前低點位移現(xiàn)象并對其前后固定時段內(nèi)等效電流體系反演結(jié)果進(jìn)行分析研究期望為地震電離層研究提供一定的技術(shù)理論支撐。文中選取INTERMAGNET全球地磁臺網(wǎng)中所有臺站2001年到2012年的數(shù)據(jù)利用球諧分析所構(gòu)建的內(nèi)、外源Sq等效電流體系模型進(jìn)行反演,結(jié)合F10.7cm、Dst指數(shù)分析其與太陽活動性之間的關(guān)系,綜合震例及震前地磁低點位移現(xiàn)象探索了內(nèi)外源Sq電流體系與地磁低點位移現(xiàn)象之間的關(guān)聯(lián)。論文主要得到的研究結(jié)論如下:(1)內(nèi)、外源Sq等效電流體系北半球電流渦中心電流強度在每年7、8月份呈現(xiàn)峰值,而南半球則正好相反,明顯呈現(xiàn)出Sq夏季大,冬季小的季節(jié)變化。這一現(xiàn)象表明Sq主要受控于太陽,且內(nèi)源成分還受到地電導(dǎo)率的影響。(2)內(nèi)、外源Sq等效電流體系南、北電流渦中心強度在磁暴期間明顯增大隨后迅速減小,同Dst指數(shù)、F10.7cm太陽射電流量均具有同步變化的規(guī)律;Sq等效電流體系南、北電流渦中心強度在磁暴較大且次數(shù)較少的年份的變化磁暴連續(xù)發(fā)生的年份更具規(guī)律性。北半球電流渦中心強度和Dst磁暴指數(shù)的對應(yīng)關(guān)系明顯強于南半球。(3)內(nèi)、外源Sq等效電流體系南、北電流渦中心電流強度年均值與F10.7cm太陽射電流量具有相同的周期性,即太陽活動周期11年,且南、北半球外源Sq等效電流體系電流渦中心強度年均值與F10.7cm太陽射電流量年均值體現(xiàn)出極好的相關(guān)性,其相關(guān)系數(shù)分別達(dá)到0.93和0.90,內(nèi)源場所展現(xiàn)的相關(guān)系數(shù)則遠(yuǎn)低于外源場,分別為0.63和0.79。(4)地磁低點位移發(fā)生當(dāng)日,內(nèi)、外源Sq等效電流體系電流渦中心強度會發(fā)生減小的現(xiàn)象,且在內(nèi)源場上減小的幅度更劇烈,而這一現(xiàn)象在地磁平靜日的北半球能夠得到良好的體現(xiàn),如2008年的5月9日、6月13日。此外,電流渦中心位置在低點位移發(fā)生時可能會有一個緯向的偏移,且在內(nèi)源場上更明顯,似乎說明低點位移與內(nèi)源等效電流體系的關(guān)系更為密切。
[Abstract]:Due to the compression of the Pacific plate, the India plate and the Philippines Sea plate in the mainland of China, the seismic fault zones are very active. Frequent earthquakes have brought great disasters and losses to the people's life, property safety and the development of the national economy. A large number of observations show that the seismic electromagnetic radiation is in the monitoring and prediction of the earthquake. In order to establish an earthquake stereo monitoring system, China has also started an earthquake electromagnetic satellite program, which is expected to be launched in 2016. The ionosphere is a region of partial ionization of the earth's high gas, and the magnetosphere is located in ionization. Above the layer, the atmosphere in it is all ionized. The magnetosphere - ionosphere is influenced by the solar activity and is influenced by the earth and its lower atmosphere. It has complex physical and chemical coupling processes. High dynamic, multi scale and special space environment make the study of the magnetosphere ionosphere current system have great complexity. The magnetosphere ionospheric current system is still in the exploration stage. Based on the theory of spherical harmonic analysis, this paper uses the theory of spherical harmonic analysis to construct the inversion model of the foreign Sq equivalent current system, and compares the inversion results with the F10.7cm solar radiation flux and the geomagnetic activity index Dst, and then selects the low point before the earthquake. The displacement phenomenon and the analysis of the inversion results of the equivalent current system in the fixed time period are expected to provide some technical support for the seismic ionosphere research. In this paper, the data of all stations in the INTERMAGNET global geomagnetic network from 2001 to 2012 are used to use the internal Sq equivalent current system model built by the spherical harmonic analysis. The relationship between the activity of the solar activity and the relationship between the F10.7cm and the Dst index is analyzed. The correlation between the internal and external Sq current system and the geomagnetic low displacement phenomenon is explored by a comprehensive seismic example and the geomagnetic low displacement phenomenon before the earthquake. The main conclusions of this paper are as follows: (1) the current vortex center in the northern hemisphere of the exogenous Sq equivalent system The current intensity is peak in 7,8 month, while the southern hemisphere is just the opposite, obviously showing a small seasonal variation of Sq summer and winter. This phenomenon indicates that Sq is mainly controlled by the sun, and the internal components are also affected by the conductivity of the earth. (2) the external Sq equivalent current system is south, and the central intensity of the north electric flow vortex is obviously increased during the magnetic storm. Then it decreases rapidly, with the same Dst index, the F10.7cm solar radio flow rate has the regularity of synchronous change, and the Sq equivalent current system is south, the central intensity of the north electric current vortex is more regular in the year of the larger magnetic storm and less times, and the corresponding relationship between the current vortex center intensity and the Dst magnetic storm index in the northern hemisphere is obviously stronger. In the southern hemisphere. (3), in the south, the annual mean value of the central current intensity of the north electric current is the same as that of the F10.7cm solar radio flow, that is, the solar activity cycle is 11 years, and the annual mean of the current vortex center intensity of the external Sq equivalent current system in the northern hemisphere is in excellent phase with the average annual mean of the F10.7cm solar radio flow. The correlation coefficient is 0.93 and 0.90 respectively, and the correlation coefficient of the internal source is far lower than that of the external field, which is 0.63 and 0.79. (4) of the geomagnetic low point displacement on the same day, and the current vortex center intensity of the foreign Sq equivalent current system decreases, and the amplitude of the decrease is more intense in the internal source field, and this phenomenon is in the geomagnetic field. The northern hemisphere of the calm day can be well reflected, such as the May 9th 2008, and the June 13th. In addition, the center position of the current vortex may have a zonal migration when the low displacement occurs, and is more obvious in the inner source field, which seems to indicate that the relationship between the low displacement and the internal source equivalent current system is more closely.

【學(xué)位授予單位】：中國地震局地震預(yù)測研究所
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P315.7

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本文編號：1865266