搜索结果: 1-14 共查到“地球物理学 cluster”相关记录14条 . 查询时间(0.171 秒)
3D BUILDING MODELS SEGMENTATION BASED ON K-MEANS++ CLUSTER ANALYSIS
3D model segmentation cluster segmentation 3D building model K-means++ cluster
2016/10/14
3D mesh model segmentation is drawing increasing attentions from digital geometry processing field in recent years. The original 3D mesh model need to be divided into separate meaningful parts or surf...
The Palermo (Sicily) seismic cluster of September 2002,in the seismotectonic framework of the Tyrrhenian Sea-Sicily border area
seismotectonics Southern Tyrrhenian Sea Northwestern Sicily
2015/9/11
The northern coast of Sicily and its offshore area represent a hinge zone between a sector of the Tyrrhenian Basin, characterized by the strongest crustal thinning, and the sector of the Sicilian belt...
磁场重联是磁能转换为等离子体能量（动量和热量）的重要物理过程之一，是当前我国乃至世界的前沿热点课题之一，同时也是空间物理和空间等离子体物理研究中最具有挑战性的问题之一。磁场重联对解密太阳耀斑爆发、磁层亚暴等灾害性空间天气事件的物理机制和太阳风能量向磁层的输入过程具有重要意义。此外，近磁尾重联与磁层亚暴的动力学过程紧密相关，将对揭示亚暴和磁层空间爆的动力学过程、及磁层空间天气预报产生重要科学意义和应...
On aspects of the measurement of non-linear turbulence processes using the cluster wave experiments
measurement of non-linear turbulence processes cluster wave experiments
2009/11/16
The ESA/NASA Cluster mission has four identical satellites and is due for launch at the end of 1995. It will provide a unique opportunity to study medium scale processes in the region from inside the ...
Large amplitude solitary waves in and near the Earth’s magnetosphere,magnetopause and bow shock:Polar and Cluster observations
Large amplitude solitary waves Earth’s magnetosphere magnetopause bow shock
2009/11/11
Solitary waves with large electric fields (up to 100's of mV/m) have been observed throughout the magnetosphere and in the bow shock. We discuss observations by Polar at high altitudes ( ~ 4-8 RE ), d...
Solitary potential structures observed in the magnetosheath by the Cluster spacecraft
Solitary potential structures magnetosheath Cluster spacecraft
2009/11/11
Bipolar pulses of ~ 25-100 µs in duration have been observed in the wave electric field data obtained by the Wideband plasma wave instrument on the Cluster spacecraft in the dayside magnetosheat...
Characteristics of quasi-static potential structures observed in the auroral return current region by Cluster
quasi-static potential structures auroral return current region Cluster
2009/11/11
Temporal and spatial characteristics of intense quasi-static electric fields and associated electric potential structures in the return current region are discussed using Cluster observations at geoce...
Solitary waves observed in the auroral zone:the Cluster multi-spacecraft perspective
Solitary waves auroral zone Cluster multi-spacecraft perspective
2009/11/11
We report on recent measurements of solitary waves made by the Wideband Plasma Wave Receiver located on each of the four Cluster spacecraft at 4.5-6.5RE (well above the auroral acceleration region) as...
Dissipation scales in the Earth's plasma sheet estimated from Cluster measurements
Dissipation scales Earth's plasma sheet Cluster measurements
2009/11/11
In order to estimate the dissipation time-scale in magnetic turbulence in the plasma sheet a novel method is introduced for classification of velocity dependent patterns of two-point probability densi...
On the generation of solitary waves observed by Cluster in the near-Earth magnetosheath
solitary waves near-Earth magnetosheath
2009/11/9
Through case studies involving Cluster waveform observations, solitary waves in the form of bipolar and tripolar pulses have recently been found to be quite abundant in the near-Earth dayside magnetos...
Projection of compact fractal sets:application to diffusion-limited and cluster-cluster aggregates
compact fractal sets diffusion-limited cluster-cluster aggregates
2009/11/2
The need to assess the three-dimensional fractal dimension of fractal aggregates from the fractal dimension of two-dimensional projections is very frequent in geophysics, soil, and atmospheric science...
Electrostatic solitary waves in current layers:from Cluster observations during a super-substorm to beam experiments at the LAPD
Electrostatic solitary waves current layers Cluster observations super-substorm beam experiments
2009/10/30
Electrostatic Solitary Waves (ESWs) have been observed by several spacecraft in the current layers of Earth's magnetosphere since 1982. ESWs are manifested as isolated pulses (one wave period) in the ...
在2001～2003年Cluster飞船通过近地磁尾期间，共探测到14次重联事件，在这些事件中同时还观测到等离子体波活动.本文把14次事件分为三大类，其中：第I类包含了8次事件，它们是在等离子体片内先于重联事件观测到波活动，并且还同时观测到Hall磁场.经过分析判断，这类事件中观测到的波是右旋偏振的哨声波.第II类包含了2次事件，这类事件也观测到了Hall磁场和右旋偏振的哨声波.第Ⅲ类也包含了2次...
Cluster探测到磁尾等离子体注入的特征
磁尾等离子体注入 晨昏对流电场 T89c磁场 Volland-Stern电场 电漂移
2008/5/20
利用Cluster卫星2001～2004年磁尾运行期间RAPID仪器的数据，确定了115例磁尾等离子体注入事件，借助时序叠加法统计研究磁尾等离子体注入现象的特征.注入事件主要分布于磁地方时夜晚20时至凌晨04时.与同步轨道区观测到的粒子注入事件类似，可以将磁尾粒子注入事件分成五类：（1）只有离子注入；（2）离子先于电子注入；（3）离子和电子同时注入；（4）电子先于离子注入；（5）只有电子注入.磁...