共查询到20条相似文献，搜索用时 452 毫秒
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M. D. Morrison J. R. Lemen L. W. Acton R. D. Bentley T. Kosugi S. Tsuneta Y. Ogawara T. Watanabe 《Solar physics》1991,136(1):105-110
All of the SOLAR-A telemetry data will be reformatted before distribution to the analysis computers and the various users. This paper gives an overview of the files which will be created and the format and organization which the files will use. The organization has been chosen to be efficient in space, to ease access to the data, and to allow for the data to be transportable to different machines. An observing log file will be created automatically using the reformatted data files as the input. It will be possible to perform searches with the observing log to list cases where instruments are in certain modes and/or seeing certain signal levels.After the launch the name of SOLAR-A has been changed to YOHKOH. 相似文献
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The EUV spectrum of a solar active region observed by SERTS-89 is used to estimate physical parameters such as electron density, elemental abundance and inhomogeneity in the emitting source. A total of 13 ions, namely, Neiv-vi, Mgv-ix, Sivii-x and Sx, are studied in the SERTS spectral range 170-450 Ú, providing plasma diagnostics at temperatures between105 –106 K. Attention is called to results derived from ion pairs of different elements that are formed over similar temperature regimes, which allow special checks on the standard assumptions of spectral analyses. Some EUV lines, not originally reported in the SERTS-89 spectrum, are shown to have measureable intensities and are indicated for future observations. 相似文献
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Analytical studies are reported here for two cosmogenic effects due to low energy particles in extraterrestrial samples:
- Formation of latent chemically etchable tracks in crystalline materials due to solid state damage as a result of ionisation losses suffered by multicharged cosmic ray nuclei, and
- Production of low threshold isotopes due to nuclear interactions of solar cosmic ray particles.
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Will M. Farr Jeff AmesPiet Hut Junichiro MakinoSteve McMillan Takayuki MuranushiKoichi Nakamura Keigo NitadoriSimon Portegies Zwart 《New Astronomy》2012,17(5):520-523
We present a data format for the output of general N-body simulations, allowing the presence of individual time steps. By specifying a standard, different N-body integrators and different visualization and analysis programs can all share the simulation data, independent of the type of programs used to produce the data. Our Particle Stream Data Format, PSDF, is specified in YAML, based on the same approach as XML but with a simpler syntax. Together with a specification of PSDF, we provide background and motivation, as well as specific examples in a variety of computer languages. We also offer a web site from which these examples can be retrieved, in order to make it easy to augment existing codes in order to give them the option to produce PSDF output. 相似文献
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我国新一代中国频谱射电日像仪（Chinese Spectral Radio Heliograph,CSRH）原始观测数据采用自定义格式,在进行后续处理与共享使用时必须转换相应的格式.在分析FITS-IDI（FITS Interferometry Data Interchange）格式的基础上,结合CSRH的实际观测模式与数据产出方式,定义与设计了符合项目情况的FITS-IDI格式及字段,并对FITS-IDI文件中若干字段的值如何获取、计算进行了深入讨论.根据定义生成的FITS-IDI文件已成功导入CASA软件,并可以进行后续处理.经过对CASA测量集文件的核实,证明了数据生成的正确性.本研究有效地推进了CSRH的建设工作,也对其他射电干涉阵数据存储有一定的参考价值. 相似文献
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Because of the effects of noise, distortion, observational environment and other factors, some appropriate preprocessing should be made in advance of automatic classification of celestial spectra. We have studied the effect of data format and flux standardization on the automatic classification of sky survey spectra. A basic model adaptable for the order-of-magnitude variation of fluxes is proposed, and the corresponding standardization methods are given. Our experimental results on galaxy and quasar classification show that the logarithmic wavelength data format is better for the automatic spectral classification. By these experiments, the reasonableness of the proposed model and the performances of the given flux standardization methods are verified. Especially, it is noted that the commonly used flux standardization is the worst, among other standardizations, for automatic spectral classification. 相似文献
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VLBI标准接口是近年来在VLBI技术中诞生的一个新概念,它旨在解决多年来各VLBI数据传输系统不兼容的问题．该文阐述了VLBI数据传输系统的发展历史,包括传统的记录／回放系统和新兴的网络数据传输两方面的内容;说明了VLBI标准接口的作用和意义;并分别介绍了VLBI标准接口规范3方面的内容:VLBI标准接口件规范(VSI-H)、VLBI标准接口软件规范(VSI-S)和VLBI标准接口网络规范(VSI-E)． 相似文献
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Landsat MSS imagery is employed to assess the aquatic complexes of the regulated Lake Kemijärvi and the adjoining small natural lakes in Northern Finland.Ground data were collected from within the hydrolittoral areas to allow the evaluation and revision of the computer-aided Landsat MSS classification. The major developments reported here are: (1) the utilization of the computer-aided technique for surveying natural and regulated aquatic areas, (2) the recognition of different aquatic units and complexes defined by depth relations, bottom quality, vegetation coverage or flooding stage, and (3) the presentation of the lower limit of satellite data applicability for mapping small-sized and complicated areas.Although the low spectral and ground resolution levels place restrictions on the use of computeraided Landsat MSS data remote sensing for the parametric mapping of all aquatic phenomena, such data are still of value under circumstances in which ground data collected from a small number of reference areas can be extrapolated to apply to the surrounding lakes and aquatic areas within a single MSS frame. Studies of this kind also facilitate the multitemporal inspection of changing regulated lake environments, due to the long-term nature of the Landsat project. 相似文献
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由于遥远的天体发出的无线电信号极其微弱,信噪比极低,VLBI系统要想得到较高的测量精度,必须尽量加大测量带宽和提高采样位数,但是这样会导致VLBI终端(比如数字基带转换器)产生的观测数据激增。传统的VLBI终端数据传输系统采用VSI接口,数据最高传输速率限制在2 Gbps,且数据记录设备必须采用定制的Mark5B设备,极其不灵活,因此已经不能适应现在VLBI系统的观测需求。为了提高数据传输速率,增加数据记录设备的灵活性,上海天文台新研制的基于多相滤波器组和快速傅里叶变换方式的数字基带转换器的数据传输系统采用了高速灵活的10 G网络接口。10 G网络系统中数据传输采用报文交换方式,因此数据到达接收端的时间不是精确可靠的,这要求数据在进入10 G网络接口之前必须已经具有标准的VLBI数据格式,所以在10 G网络前端设计了Mark5B格式器。详细介绍了基于现场可编程门阵列的Mark5B格式器及10 G网络传输系统的设计原理,并在文章的最后通过三组实验验证了其功能的正确性和性能的稳定性。 相似文献
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M. Kissler‐Patig Y. Copin P. Ferruit A. Pcontal‐Rousset M.M. Roth 《Astronomische Nachrichten》2004,325(2):159-162
As integral field spectrographs have become more common around the world and in Europe in particular, the need for a common data format has been recognized. Here, we present the Euro3D format that is adapted as a post‐instrumentalsignature‐removal format for all instruments within the Euro3D network. It follows the FITS standard, and includes several extensions, all of them being binary FITS tables. This article is intended to give a comprehensive overview, but does not attempt to serve as a full definition document. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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A method for deriving a planetary interior model which exactly satisfies a set of N gravitational constraints is implemented. For Jupiter, recent spacecraft measurements provide the mass, radius at a standard pressure level, rotation law, multipole moments of the internal mass distribution, and constraints on the internal composition and temperature distribution. By appropriate iterations, interior models are found which exactly satisfy these constraints. The models are assumed to have constant chemical composition and constant specific entropy in the hydrogenic envelope. The derived pressure-density relation in the outer envelope depends sensitively on the observational uncertainty in the mass multipole moment J4. Models are not forced to fit the more indirectly derived constraints, which are instead used as consistency checks. For a helium mass fraction in the envelope (Y) equal to 0.20, the inferred pressure at a mass density ≈ 0.2 g/cm3 is about a factor of 2 higher than would be indicated by experimental hydrogen shock compression data in the relevant pressure range of 105 to 106 bar. The inferred pressure distribution is in much better agreement with the shock data for a nominal Y = 0.30 ± 0.05. This value of Y is interpreted in terms of an enhancement in the envelope, by a factor of order 5 over solar abundance, of species primarily consisting of CH4, NH3, and possibly H2O. The same method is applied to Saturn, but existing uncertainties in Saturn's gravitational parameters are still too large to allow useful conclusions about the composition of its envelope. 相似文献
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SLR新星历及其在卫星预报中的应用 总被引：1，自引：0，他引：1
目前卫星激光测距(SLR)中所采用的IRV星历已经使用了近20年,近几年来随着对高轨卫星的测距和卫星白天测距的开展以及考虑到今后激光测距技术的发展,需要对SLR所采用的星历进行改进,以适应SLR发展的需求。从2006年8月起国际激光测距网(ILRS)将使用一种新的可用于多种目标测距的星历——CPF星历,该星历不仅可用于人造卫星的激光测距,而且还可用于月球及其转发器等目标的激光测距。该文介绍了这种SLR新星历和应用它进行卫星位置台站预报的情况,分析了其预报精度。 相似文献
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In the present paper various observational data are used to compare seven most common models proposed to describe the behaviour
of the interstellar extinction in different parts of the sky. The data for field stars, open and globular clusters are used
to select the most adequate model at different distances and for different directions in the Galaxy. The results of this study
allow to select the best models for particular distances and directions. They also make it possible to propose a synthesized
model describing the interstellar extinction.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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Peter J. Shelus 《Celestial Mechanics and Dynamical Astronomy》1985,37(3):243-246
One of the main goals of fundamental astronomy is to allow us to locate ourselves accurately in space and time. Each observational technique cannot supply all of the answers all of the time, and the joining of results from different techniques requires a true understanding of the particular reference frame which underlies each one. In this paper we try to state the present situation in our attempts to tie artificial satellite and lunar laser ranging data through the construction of stations designed to make both kinds of observations. This type of development strengthens both data types and eases their combination with other data types. 相似文献