【文章內(nèi)容簡介】 項即能反映TEC的主要變化，采用經(jīng)驗正交函數(shù)建?？梢杂幂^少的參數(shù)表征較復(fù)雜的物理過程。此外，本文還就TEC模式的外部驅(qū)動量的改進(jìn)問題作了一些探討，發(fā)現(xiàn)用F107A（）作TEC建模的外部驅(qū)動量能夠更好地提高EOF模式的精度和穩(wěn)定性。關(guān)鍵詞 電子濃度總含量 經(jīng)驗正交函數(shù) 電離層經(jīng)驗?zāi)Ｊ?電離層變化 太陽活動對流層特大暴雨天氣對電離層變化的影響徐桂榮1,2,3 萬衛(wèi)星1 寧百齊1 1 中國科學(xué)院地質(zhì)與地球物理研究所 北京 1000292 中國科學(xué)院武漢物理與數(shù)學(xué)研究所3 中國科學(xué)院研究生院摘 要 研究氣象活動對電離層變化的影響。利用時序疊加方法，通過對1958－1998年期間發(fā)生在武漢的5次特大暴雨天氣事件對武漢上空電離層變化的影響進(jìn)行分析，發(fā)現(xiàn)：（1）特大暴雨能夠引起低電離層fbEs和foEs參量較明顯地減小；（2）特大暴雨對電離層F區(qū)尋常波描跡的最低虛高h(yuǎn)’F和電離層等效峰高h(yuǎn)pF的參量也有一定影響，且隨著雨量的增大這種影響作用也會增加；（3）特大暴雨對電離層其它參量影響甚弱或沒有影響。本文認(rèn)為，特大暴雨天氣事件對電離層的影響主要來自于動力過程，特別是特大暴雨激發(fā)的或相伴的大氣重力波、潮汐波和行星波等長周期大尺度過程的作用。關(guān)鍵詞 特大暴雨；電離層變化；時序疊加法The frequency variation of Pc5 ULF waves during a magnetic stormA. Du1 , , and X. Gao31 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing2 Geophysical Institute, University of Alaska Fairbanks3 Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing(Received September 3, 2004。 Revised May 30, 2005。 Accepted May 30, 2005)Abstract The relationship between Pc5 ULF waves and the asymmetric ring current during the magnetic storm on July 15, 2000 is studied using groundbased magnetometer data and particle observations by the LANL satellite. A frequency decreases of Pc5 is noted during the main phase, which can be attributed to injections of heavier ions (O+ and He+) into the ring current. In addition, it is observed that during the main phase of the storm, the frequency drop of the Pc5 in the IMAGE chain around the MLT midnight is larger than that in the ALASKA chain at MLT post noon.. Meanwhile, the longitudinal variation of ΔH with the maximum around midnight implies a highly asymmetric distribution of the ring current. These results suggested that the frequency variation of Pc5 pulsation during storms is related to the partial distribution in the ring current.地球深部結(jié)構(gòu)與過程研究室A detailed receiver function image of the sedimentarystructure in the Bohai Bay BasinTianyu Zheng, Liang Zhao, Ling ChenSeismic Laboratory (SKLLE), Institute of Geology and Geophysics, Chinese Academy of Sciences, Deshengmenwai, Qijiahuozi,Chaoyang District, Beijing 100029, ChinaReceived 5 January 2005。 received in revised form 28 April 2005。 accepted 3 June 2005Abstract If the site at which receiver functions are constructed is filled by sediments, then the waveforms from these receiver functions are dominantly controlled by the sedimentary structures within the first few seconds after the direct P arrival. Based on this observation, waveform data collected at 44 temporary seismic stations have been used to image the sedimentary structure of the Bohai Bay Basin, a major continental petroliferous basin in Eastern China. An adapted hybrid global waveform inversion method was applied to the receiver functions to extract structural information beneath each of the stations. The derived Svelocity structure provides for the first time, a basinscale seismic image of detailed sedimentary stratification. The sedimentary cover of the basin is about 2–12 km thick, consisting of Cenozoic, Mesozoic, and Paleozoic strata from top to bottom. The structural features presented in the Svelocity image coincide quite well with the depression–uplift type of tectonic system in the Bohai Bay Basin. The reconstructed morphology of the sedimentary layers provides seismological evidence for the twostage evolution of the intracontinental basin that were caused by an intensive tectonic regime transition in late Mesozoic immediately following the lithospheric reforming of the Eastern China continent. 169。 2005 Elsevier . All rights reserved.Keywords: Receiver function。 Sedimentary structure。 Global inversion。 Bohai Bay BasinSeismic structure of the Bohai Bay Basin, northern China:Implications for basin evolutionLiang Zhao, Tianyu ZhengInstitute of Geology and Geophysics, Chinese Academy of Sciences, Qijiahuozi, Deshengmenwai, Chaoyang District, . Box 9825,Beijing 100029, PR ChinaReceived 1 July 2004。 received in revised form 28 November 2004。 accepted 20 December 2004Available online 1 February 2005 Editor: . van der HilstAbstract As part of an extensive seismic research program, 33 portable broadband seismic stations were deployed along a linecrossing the Bohai Bay Basin, northern China. Three teleseismic events were selected to constrain the seismic structure along a ~280 km profile across the western edge of the basin. We determined the basin structure that described the observed shear horizontal (SH) wave field. The synthetic SH wave was calculated using a finite difference (FD) method with its putational domain localized in the basin area and input motions at the base of the model extrapolated from the displacement recorded at a nearby hardrock station. Synthetic seismographs calculated for the models match the observations well in both waveform and travel time. Numerical tests indicate that the structural features of the preferred models are well resolved. The analysis of relations between structures and stratigraphic units along the cross sections allows multiple deformational events in the basin to be inferred. In conjunction with a profile across the southern edge that has been presented previously by Zhao et al. [14] [L. Zhao, . Zheng, . Xu, Modeling the Jiyang depression, Northern China, using a wave field extrapolation FD method and waveform inversion, Bull. Seismol. Soc. Am. 94 (2004) 988–1001], the results reveal basinwide extension with local inversion features in the Bohai Bay basin. D 2005 Elsevier . All rights reserved.Keywords: Cenozoic。 SH wave modeling。 basin seismology。 sedimentary basin structurePhysics of the Earth and Planetary Interiors 151 (2005) 309–319Anisotropy of akimotoite: A molecular dynamics studyYigang Zhang, Dapeng Zhao, Masanori Matsuia State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics,Chinese Academy of Sciences, Beijing 100029, Chinab Geodynamics Research Center, Ehime University, Matsuyama 7908577, Japanc School of Science, Un