Considerations concerning the non-rigid Earth nutation theory     

F. Arias  Ch. Bizouard  P. Bretagnon  A. Brzezinski  B. Buffett  N. Capitaine  P. Defraigne  O. de Viron  M. Feissel  H. Fliegel  A. Forte  D. Gambis  J. Getino  R. Gross  T. Herring  H. Kinoshita  S. Klioner  P.M. Mathews  D. Mccarthy  X. Moisson  S. Petrov  R.M. Ponte  F. Roosbeek  D. Salstein  H. Schuh  K. Seidelmann  M. Soffel  J. Souchay  J. Vondrak  J.M. Wahr  P. Wallace  R. Weber  J. Williams  Y. Yatskiv  V. Zharov  S.Y. Zhu 《Celestial Mechanics and Dynamical Astronomy》1998,72(4):245-309

This paper presents the reflections of the Working Group of which the tasks were to examine the non-rigid Earth nutation theory. To this aim, six different levels have been identified: Level 1 concerns the input model (giving profiles of the Earth's density and theological properties) for the calculation of the Earth's transfer function of Level 2; Level 2 concerns the integration inside the Earth in order to obtain the Earth's transfer function for the nutations at different frequencies; Level 3 concerns the rigid Earth nutations; Level 4 examines the convolution (products in the frequency domain) between the Earth's nutation transfer function obtained in Level 2, and the rigid Earth nutation (obtained in Level 3). This is for an Earth without ocean and atmosphere; Level 5 concerns the effects of the atmosphere and the oceans on the precession, obliquity rate, and nutations; Level 6 concerns the comparison with the VLBI observations, of the theoretical results obtained in Level 4, corrected for the effects obtained in Level 5.Each level is discussed at the state of the art of the developments.  相似文献   

On the use of analytical theories in the calculation of precession-nutation     

P. Bretagnon 《Celestial Mechanics and Dynamical Astronomy》1996,65(1-2):95-106

We present the use of the analytical solutions of the planets and of the Moon's motion in the determination of the quantities which relate the barycentric and the geocentric coordinate systems and of the expressions of precession-nutation. The computation of the precession and nutation quantities are built with the analytical theories of the motion of the Moon, the Sun and the planets of the Bureau des longitudes. We take into account the influence of the Moon, the Sun and all the planets on the potential of the Earth limited to C _j,0 for j from 2 to 5, C _2,2, S _2,2, C _3, S _3, , for from 1 to 3 and C _4,1, S _4,1. We determine the 3 Euler angles , , and 2 calculating the components of the torque of the external forces with respect to the geocenrer in the case of the rigid Earth. The equations are solved by iterations and so are taken into account the nutations-on-the-nutations effects. We have determined the analytical variations of the angles and w fixing the equator with respect to the ecliptic J2000. We find, in w, a secular term of –26.5026 mas per century. The analytical solution of the precession-nutation has been compared to a numerical integration over the time span 1900–2050. The differences do not exceed 16 µas for and 12 µas for .  相似文献   

57～48万年前东亚夏季风的神农架石笋记录   总被引：2，自引：0，他引：2  

童凯  汪永进  程海  姜修洋 《海洋地质与第四纪地质》2007,27(4):111-116

应用MC-ICP-MS和MAT-253质谱技术,实测神农架山宝洞一支长达1.2 m石笋(SB32)的3个230Th年龄和236个氧同位素数据。在年龄误差范围内,运用天文轨道调谐方法重建了570~480 kaBP时段百年至千年际分辨率东亚夏季风降水记录。该记录跨越4个完整的岁差旋回,在岁差周期上石笋δ18O平均振幅达4‰。研究时段内东亚夏季风轨道尺度变化仍然受太阳辐射的控制。石笋记录的深海氧同位素阶段MIS14/13转换过程与末次冰消期具有类似特征。一系列千年尺度事件叠加在岁差周期夏季风变化趋势上,表明千年尺度气候变化是地球气候系统内部自我维持的固有频率,可能属于海-陆-气相互作用的结果。  相似文献   

质子激发X射线荧光分析及其在海洋科学中的应用     

邢娜  黄奕普 《台湾海峡》2007,26(3):443-452

质子激发X射线荧光分析是一种多元素微量分析技术,具有高灵敏度、高空间分辨率和非破坏性等特点,近年来在地球科学诸多领域得到大量应用.本文简介了质子激发X荧光分析技术的基本原理、实验装置及特点,与其他地质学方法进行了比较,并着重介绍该技术在海洋科学领域的应用进展.  相似文献   

On the response of the neutral temperature at 78°N and 90 km altitude to solar proton events     

C.M. Hall  T. Aso  M. Tsutsumi 《Polar Science》2008,2(1):9-14

We are able to determine neutral air temperatures by examining the fading times of meteor trail echoes in the upper mesosphere/lower thermosphere. It has been suggested that solar proton events may stimulate both dynamic and aeronomic changes in the middle atmosphere and we have endeavoured to investigate this. Despite a variety of approaches to determine the background temperature above which we might expect to see enhancements under conditions of strong proton precipitation, we are unable to detect any significant changes. We have repeated the search during selected seasons and also with various proton flux thresholds, similarly to no avail. We conclude, therefore, that at 90 km altitude, 78°N and 16°E, at least, we are unable to detect enhanced neutral temperatures due to solar proton events. At best, any enhancements, predicted to be of the order of a few K only, are likely to be completely masked by the day-to-day variability of the temperature field.  相似文献   

FHD质子矢量磁力仪资料预处理分析     

陈永花 《高原地震》2012,24(2):45-49

青海省地磁FHD质子矢量磁力仪观测已投入运行3年有余,为了提高地磁FHD质子磁力仪观测质量,通过对西宁、德令哈、都兰、湟源、大武5个地震台FHD仪动态变化曲线的分析,给出合理的预处理方法与技巧。  相似文献   

FHD-2B分量质子磁力仪维护技术   总被引：1，自引：1，他引：0  

居海华  夏忠 《地震地磁观测与研究》2012,33(5):135-141

介绍FHD-2B分量质子磁力仪的基本原理与系统构成,及仪器日常检查的重要性与流程,着重介绍仪器常见故障的现象与原因,以及检修方法与流程。  相似文献   

FHD数字核旋仪标定必要性分析     

郭建芳  胡秀娟  张环曦  周剑青  薛志芳  于春颂  张墨思  尹小兵 《华北地震科学》2010,28(3):48-52

通过斜率法、差值法分析了中国部分FHD-2B核旋仪Z分量相对夜均值,发现未经过绝对观测基线值校正的相对观测数据存在不同程度的数据漂移情况,其原因主要包括季节变化带来的温度影响、各种原因造成的台阶影响、仪器墩倾斜等。鉴于此,日常工作应定期标定FHD仪,消除因各种漂移产生的测量误差。  相似文献   

乾陵地震台FHD磁力仪与CB-3磁变仪记录资料的相关分析     

王凤 《地震地磁观测与研究》2010,31(5):91-94

针对陕西省乾陵地震台FHD分量质子磁力仪和CB-3型三分向磁变仪的记录资料,利用线性相关性分析法,求出这两种仪器记录曲线的相关系数及剩余离散程度,定量分析其记录资料的相似程度,查看是否满足地震预报工作对资料连续性的要求。研究认为,两台仪器的观测数据一致性较高,两种资料延续衔接使用的可能性比较高。  相似文献   

永安地磁台FHD-2B质子磁力仪观测数据干扰分析     

全建军  夏忠  张凯  刘水莲  陈珊桦  刘礼诚  陈美梅 《地震地磁观测与研究》2015,(1)

从自然、仪器自身、人为干扰、外界环境等干扰因素的典型表现,对永安地磁台FHD-2B质子磁力仪观测数据进行分析,识别并剔除干扰,为进一步提高地磁观测资料质量提供依据。  相似文献