搜索结果: 136-150 共查到“知识库 空间物理学”相关记录1150条 . 查询时间(2.734 秒)
Analysis of Dust Aerosol by Using Dual-Wavelength Lidar
Dust aerosol Size distribution Dual-wavelength lidar Lidar ratio
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2016/3/25
Simulation of dust aerosol optical property is rather difficult, due to its extremely irregular shape, which often brings about
difficulties in transforming its physical properties (such as size dist...
电离层中小尺度扰动的多频多普勒快速探测与分析
电离层中小尺度扰动 快速探测 多频探测系统 多普勒频移 电子浓度等值面法向运动速度
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2018/5/4
电离层反射回波的高频多普勒频移测量是研究电离层扰动的重要方法之一.利用基于单频信号相位变化率测量的实时探测方法，获取连续高精度多频多普勒频高图，以实现中小尺度电离层扰动的快速探测研究.该方法被应用于敏捷式高性能电离层无线电多频探测系统样机平台.经验证在该平台上获取的多普勒频移分辨率可达0.039Hz，频高图探测周期最短小于1min.基于这种快速探测方法和平台在武汉观测站进行了较长时间的观测和数据采...
嫦娥三号“玉兔”巡视器热控制
热控系统 同位素热源 两相流体回路
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2015/11/10
根据嫦娥三号“玉兔”巡视器总体构形特点和任务过程中的环境条件，提出了巡视器月昼散热和月夜保温热控设计思路，具体描述了巡视器月昼朝天散热和月夜利用两相流体回路、同位素热源进行设备保温的热控设计方法。经过热平衡试验验证和在轨飞行验证，热控分系统的各项功能和性能均满足总体要求，设备温度均控制在所要求的温度范围内，表明热控设计是合理和可行的。
High-Resolution Non-Oscillatory Central Schemes with Non-Staggered Grids for Hyperbolic Conservation Laws
hyperbolic conservation laws central schemes staggered grids
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2015/10/8
We present a general procedure to convert schemes which are based on staggered spatial grids into non-staggered schemes. This procedure is then utilized to construct a new family of non-staggered, cen...
On the derivation of an hourly local index to define the normal ionosphere
reference ionosphere ionospheric disturbance ionospheric indices
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2015/9/30
In this paper an hourly local ionospheric index f n F 2 is proposed to define the normal level of the undisturbed
ionosphere. For the determination of this index a model is developed where the normal...
ON-LINE INTEGRATION OF GIS AND GPS FOR AUTOMATIC AND INTELLIGENT UPDATING OF SPATIAL DATA
Automatic GPS GIS Integrated Systems Rule-based system spatial data Updating
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2015/9/28
One of the most expensive stages in implementation of a GIS system is preparation of spatial data to be entered to the system. It can be said that about 60-80 percent of the project cost is spent for ...
ADDING VALUE TO SPATIAL DATA INFRASTRUCTURES THROUGH VISUAL ANALYTICS SERVICES FOR GEOMARKETING
Geovisualization spatial analytics service infrastructure ebusinesss models ,
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2015/9/28
Spatial data infrastructures will shift from data catalogues to federated platforms for the development of low cost and low risk
applications. The GEOeBIZ project will contribute to this development...
Magnetic and solar effects on ionospheric absorption at high latitude
ionospheric absorption solar protons emissions
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2015/9/25
Some periods of intense solar events and of strong magnetic storms have been selected and their effects on the ionospheric D region have been investigated on the basis of ionospheric absorption data d...
Mapping plasma structures in the high-latitude ionosphere using beacon satellite, incoherent scatter radar and ground-based magnetometer observations
Beacon satellites ionospheric plasma
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2015/9/25
In the autumn of the year 2000, four radio receivers capable of tracking various beacon satellites were set up along the southwestern coast of Greenland. They are used to reconstruct images of the ion...
Forecasting of ionospheric characteristics during quiet and disturbed conditions
Forecasting procedure quiet and disturbed conditions
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2015/9/25
An autocovariance forecasting procedure for single location ionospheric characteristics is presented. Its accuracy is illustrated as a function of the amount of time extrapolation for selected Europea...
The response of the ionosphere to faint and bright solar flares as deduced from global GPS network data
ionopshere Total Electron Content
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2015/9/25
Results derived from analysing the ionosphere response to faint and bright solar flares are presented. The analysis used technology of a global detection of ionospheric effects from solar flares as de...
Electon density profiles of the topside ionosphere
ionograms electron density profiles satellite orbits altitude
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2015/9/25
The existing uncertainties about the electron density profiles in the topside ionosphere, i.e., in the height region from h m F 2 to ~ 2000 km, require the search for new data sources. The ISIS and Al...
Statistical properties of the deviations of f 0 F 2 from monthly medians
deviations solar cycle
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2015/9/25
The deviations of hourly f 0 F 2 from monthly medians for 20 stations in Europe during the period 1958-1998 are studied. Spectral analysis is used to show that, both for original data (for each hour) ...
Coupling from below as a source of ionospheric variability: a review
Lower atmosphere ionospheric response waves thermosphere
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2015/9/25
The purpose of this paper is to review shortly some observational backgrounds for the suggestion of a genuine link between processes in the lower atmosphere and ionospheric response. Attention is conc...
Could we find any signal of the stratosphere-ionosphere coupling in Antarctica?
ionosphere-stratosphere interaction temperature profiles
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2015/9/25
An investigation searching for a possible coupling between the lower ionosphere and the middle atmosphere in Antarctica is here performed on the basis of stratospheric vertical temperature profiles an...