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| 1 | A comparative study on 3-D solar wind structure observed by Ulysses and MHD simulation显示文摘During Ulysses’ first rapid pole-to-pole transit from September 1994 to June 1995, its observations showed that middle- or high-speed solar winds covered all latitudes except those between ?20° and +20° near the ecliptic plane, where the velocity was 300―450 km/s. At poleward 40°, however, only fast solar winds at the speed of 700―870 km/s were observed. In addition, the transitions from low-speed wind to high-speed wind or vice versa were abrupt. In this paper, the large-scale structure of solar wind observed by Ulysses near solar minimum is simulated by using the three-dimensional numerical MHD model. The model com- bines TVD Lax-Friedrich scheme and MacCormack II scheme and decomposes the calculation region into two re- gions: one from 1 to 22 Rs and the other from 18 Rs to 1 AU. Based on the observations of the solar photospheric magnetic field and an addition of the volumetric heating to MHD equations, the large-scale solar wind structure mentioned above is reproduced by using the three-dimensional MHD model and the numerical results are roughly consistent with Ulysses’ observations. Our simulation shows that the initial magnetic field topology and the addition of volume heating may govern the bimodal structure of solar wind observed by Ulysses and also demonstrates that the three-dimensional MHD numerical model used here is efficient in modeling the large-scale solar wind structure. | FENG Xueshang, XIANG Changqing, ZHONG Dingkun & FAN Quanlin SIGMA Weather Group, Key Laboratory of Space Weather Key Labo- ratory of Geospace Environment and Geodesy, Ministry of Education, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100080, China | 2005 | Chinese Science Bulletin2005，50，7： | 6 |
| 2 | A tentative study for the prediction of the CME related geomagnetic storm intensity and its transit time显示文摘Using 80 CME-ICME events during 1997.1―2002.9, based on the eruptive source locations of CMEs and solar magnetic field observation at the photosphere, a current sheet magnetic coordinate (CMC) system is established in order to study the propagation of CME and its geoeffectiveness. In context of this coordinate system, the effect of the eruptive source location and the form of heliospheric current sheet (HCS) at the eruptive time of CME on the geomagnetic storm intensity caused by CME and the CME’s transit time at the Earth is investigated in detail. Our preliminary conclusions are: 1) The geomagnetic disturbances caused by CMEs tend to have the so-called “same side-opposite side effect”, i.e. CMEs erupt from the same side of the HCS as the earth would be more likely to arrive at the earth and the geomagnetic disturbances associated with them tend to be of larger magnitude, while CMEs erupting from the opposite side would arrive at the earth with less probability and the corresponding geomagnetic disturbance magnitudes would be relatively weaker. 2) The angular separation between the earth and the HCS affect the corresponding disturbance intensity. That is, when our earth is located near the HCS, adverse space weather events occur most probably. 3) The erupting location of the CME and its nearby form of HCS will also affect its arrival time at the earth. According to these conclusions, in this context of CMC coordinate we arrive at new prediction method for estimating the geomagnetic storm intensity (Dstmin) caused by CMEs and their transit times. The application of the empirical model for 80 CME-ICME events shows that the relative error of Dst is within 30% for 59% events with Dstmin≤?50 nT, while the averaged absolute error of transit time is lower than 10 h for all events. | ZHAO Xinhua1,2 & FENG Xueshang1,3 1. SIGMA Weather Group, Key Laboratory of Space Weather, Center for Space Science and Applied Re-search, Chinese Academy of Sciences, Beijing 100080, China 2. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China 3. School of Geophysics and Geoinformation Systems, China University of Geosciences, Beijing 100083, China | 2005 | Science China(Technological Sciences)2005，48，6： | 4 |
| 3 | Numerical study of successive CMEs during November 4―5, 1998显示文摘We present the solar-terrestrial transit process of three successive coronal mass ejections (CMEs) of November 4―5, 1998 originating from active region 8375 by using a time-dependent three-dimensional magnetohydrodynamics (MHD) simula-tion. These CMEs interacted with each other while they were propagating in inter-planetary space and finally formed a 'complex ejecta'. A newly developed SIP-CESE MHD model was applied to solve MHD equations numerically. The quiet solar wind was started from Parker-like 1D solar wind solution and the magnetic field map was calculated from the solar photospheric magnetic field data. In our simulation, the ejections were initiated using pulse in the real active region 8375. The interplanetary disturbance parameters, such as speed, direction and angular size of the expanding CME, were determined from the SOHO/LASCO data with the cone-model. We discussed the three-dimensional aspects of the propagation, in-teraction and merging of the three ejections. The simulated interplanetary shocks were compared with the nearby-Earth measurement. The results showed that our simulation could reproduce and explain some of the general features observed by satellite for the 'complex ejecta'. | ZHOU YuFen & FENG XueShang SIGMA Weather Group, State Key Laboratory for Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China | 2008 | Science China(Technological Sciences)2008，51，10： | 3 |
| 4 | Bridge无家可归者援助中心显示文摘在德克萨斯州内陆,当前的星星都较之前闪亮。这要归功于利他主义和赋予妇女权力的愿望:"桥"——一幢漂亮的耗资1700万美元的现代结构($2152sq mt/$200sf)——这项工程提升了达拉斯的形象。这幢充满温情的无家可归者援助中心是2010年德克萨斯州年度建筑的标杆:由位于圣安东尼奥的Overland合伙建筑师事务所设计,并由达拉斯当地的Camargo Copeland负责现场监理。 | Bradley Wheeler Sigma Ning Charles Davis Smith | 2011 | 中外建筑2011，，9： | 2 |
| 5 | J Am Chem Soc显示文摘 | Takuji Hataeyama Sigma Hashimoto Kentaro Ishizuka | 2009 | 1312009，，11： | 1 |
| 6 | The influence of the mode of anaesthesia in the incidence of neonal morbidity after an elective caesarean section 显示文摘 | SigMas J Galazios G Tsikfikord I | 2006 | Clin Exp Obstet Gynecol2006，33，1： | 1 |
| 7 | Elastic-wave propagation through disordered and/or absorptive layered systems显示文摘 | SigMas M M Soukoulis C M | 1995 | Phys Rev B1995，51，5： | 1 |
| 8 | Evidence for the presence of alphalad renoceptor subtypes in the human ureter显示文摘 | SigMa S DellabellaM Milanese G | 2005 | Neurourol Urodyn2005，24，2： | 1 |
| 9 | Web user's cuhural profiles and e-service quality: Internationalis-ation implications for tourism websites 显示文摘 | SigMa M Sakellaridis O | 2004 | Information Technology & Tourism2004，50，1： | 1 |
| 10 | Vascular endothelial growth factor and matrix'metalloproteinase-9 expression in human carotid atherosclerotic plaques:relationship with plaque destabilization via neovascularization 显示文摘 | Papalambros E SigMa F Georgopulos S | 2004 | Cerebrovasc Dis2004，18，2： | 1 |
| 11 | Elastic and acoustic wave band structure显示文摘 | SigMas M M Economou E N | 1992 | Sound Vib1992，，2： | 1 |
| 12 | RKA interference against HPV16E7 oncogene leads to viral E6 and E7 suppression in cervical cancercells and apoptosis via upregulation of Rb and p53 显示文摘 | Sigma N Wang W Kong D | 2008 | Apoptosis2008，13，： | 1 |
| 13 | Evidence for the pres- ence of alpha1 adrenoceptor subtypes in the human ureter 显示文摘 | SigMa S Dellabel|a M Milanese G | 2005 | Neurourol Urodyn2005，24，2： | 1 |
| 14 | World insurance in 2012 : Non - life ready for take-off, Statistical appendix, update January 2014 显示文摘 | Sigma S R | 2013 | sigma2013，，3： | 1 |
| 15 | World Insurance In 2013 :Steering Towards Recovery 显示文摘 | Sigma S R | 2014 | sigma2014，，3： | 1 |
| 16 | 责任险理赔趋势\新兴风险与经济因素反弹显示文摘 | sigma | 2014 | 瑞士再保险2014，，4： | 1 |
| 17 | 银行保险最新趋势;机遇和挑战[J]显示文摘 | Sigma | | 瑞士再保险0，，： | 1 |
| 18 | Chemical nucleases显示文摘 | Sigma D S Mazuder A Perrin D M | 1993 | Chem Rev1993，93，： | 1 |
| 19 | Elastic Wave Band Gaps and Defect States in Two-dimensional Composites 显示文摘 | SigMas M M | 1997 | Journal of The Acoustical Society of America1997，101，3： | 1 |
| 20 | Evidence for the presence of alphal adrenocep- tor subtypes in the human ureter显示文摘 | SigMa S Dellabella M Milanese G Fornari S Faccoli S Pa- lazzolo F | 2005 | NeurourolUrodyn2005，24，： | 1 |
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