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Science China Technological Sciences - We use 9 years data of Cluster to study the dependencies of plasma parameters and energy transport in the plasma sheet on the lasting time of... 相似文献
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The magnetic reconnection of magnetosphere and the magnetospheric space storms (including magnetospheric substorm, magnetic
storm, magnetospheric particle storm) has long been one of the most challenging subjects in the solar-terrestrial physics.
The reconnection mechanism and global triggering process of the magnetospheric space storms are still unclear up to now. Based
on the Double Star Program (DSP) and Cluster joint measurements, we have observed the solar wind density hole, the component
magnetic field reconnection in the magnetopause, the structures of magnetic storm ring current, global and multi-scale driven
and triggering processes of magnetospheric substorm. In this paper we will briefly introduce these results. 相似文献
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Li Lu S. Mckenna-Lawlor S. Barabash J. Balaz ZhenXing Liu Chao Shen JinBin Cao ChaoLing Tang 《中国科学E辑(英文版)》2008,51(10):1731-1744
A method is presented for retrieving the magnetospheric ion distribution from Energetic Neutral Atom (ENA) measurements made
by the NUADU instrument on the TC-2 spacecraft. Based on the already well-established method of constrained linear inversion,
an iterance technique suitable for the low count ENA measurements has been developed which is tolerant of the noise background.
By the iterance technique, it is possible for the first time to simultaneously retrieve the magnetospheric ion distribution
and the exospheric neutral density, and further to recover global ENA emissions in three dimensions. The technique is applied
to a representative ENA image recorded in energy channel 2 (protons: 50–81 keV) of the NUADU instrument during a major geomagnetic
storm and it is, thereby, shown that the retrieval method developed provides a useful tool for extracting ion distribution
information from ENA data.
Supported by the National Natural Science Foundation of China (Grant No. 40674083) and Chinese National Key Laboratory research
outlay (Grant No. 40523006). SMcKL acknowledges with appreciation the support of Enterprise Ireland 相似文献
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XuHui Shen XueMin Zhang ShiGeng Yuan LanWei Wang JinBin Cao JianPing Huang XingHong Zhu Picozzo Piergiorgio JianPing Dai 《中国科学:技术科学(英文版)》2018,61(5):634-642
The China Seismo-Electromagnetic Satellite (CSES) mission was proposed in 2003 and approved in 2013 after ten years’ scientific and engineering demonstrations. To meet the requirement of scientific objectives, the satellite is designed to be in a sunsynchronous orbit with an altitude of 507 km and descending node time of 14:00 LT. The CSES satellite carries 8 instruments, including search-coil magnetometer (SCM), electric field detector (EFD), high precision magnetometer (HPM), GNSS occultation receiver (GOR), plasma analyzer package (PAP), langmuir probe (LAP), high energetic particle package (HEPP) and detector (HEPD), and tri-band beacon (TBB), among which HEPD is provided by Italian Space Agency. The CSES satellite was launched successfully on February 2, 2018, and is planned to operate for 5 years. The CSES mission is the first satellite in China to measure geophysical fields, which will have a lot of application prospects in the study of seismology, geophysics, space sciences, and so on. 相似文献
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JinBin Cao Li Zeng Feng Zhan ZuoGui Wang Yan Wang Yu Chen QingChun Meng ZhanQiang Ji PengFei Wang ZhongWei Liu LingYu Ma 《中国科学:技术科学(英文版)》2018,61(5):653-658
The seismic activities on the Earth can produce a disturbance of the electromagnetic field and particles in the ionosphere. The search coil magnetometer(SCM) mounted on China Seismo-Electromagnetic satellite(CSES) is designed to measure the magnetic field fluctuation of low frequency electromagnetic waves in the frequency range of 10 Hz–20 k Hz. The SCM comprises a three-axis search coil sensor mounted on a 4.5 m boom and an electronic box inside satellite module. The sampling rate of the SCM is 51.2 k Hz and the time resolution of the power spectrum density(PSD) is 2 s. The frequency resolution is 12.5 Hz.There are three operation modes: survey, detailed survey and calibration. In the survey mode, the SCM can provide a PSD in the whole frequency range of 10 Hz–20 k Hz and wave forms in the low frequency range below 2 k Hz while in the detailed survey mode the SCM can provide both PSD and wave forms in the whole frequency range of 10 Hz–20 k Hz. The sensitivity of the SCM instrument is 5.0×10~(-4) n T Hz~(-1/2) at 10 Hz, 5.0×10~(–5) n T Hz~(-1/2) at 200 Hz, 3.4×10~(-5) n T Hz~(-1/2) at 2 k Hz and 1.1×10~(-4) n T Hz~(-1/2) at 20 k Hz. The telemetry rate is ~0.85 Mbps in the survey mode and ~3.0 Mbps in the detailed survey mode. The phase difference between three axes can be made generally with a precision of less than 1.0°. The dynamic range of the SCM instrument is over 100 d B. The orthogonality of three mechanical axes of search coil senor is better than 0.13°. The performance of SCM can satisfy the requirement of scientific objectives of CSES mission. 相似文献
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The rapid change in the Earth’s magnetosphere caused by solar wind disturbances has been an important part of the solar wind-magnetosphere interaction.However most of the previous studies focused on the perturbation of the Earth’s magnetic field caused by solar wind dynamic pressure changes.In this paper,we studied the response of geosynchronous magnetic field and the magnetic field to the rapid southward turning of interplanetary magnetic field during the interval 1350 1420 UT on 7May 2007.During this event,BZ component of the interplanetary magnetic field decreased from 15 nT to 10 nT within 3 min(1403 1406 UT).The geosynchronous magnetic field measured by three geosynchronous satellites(GOES 10 12)first increased and then decreased.The variations of magnetic field strength in the morning sector(9 10 LT)were much larger than those in the dawn sector(5 LT).Meanwhile,the H components of geomagnetic field on the ground have similar response features but exhibit latitude and LT dependent variations.Compared with H components,the D components do not have regular variations.Although the solar wind dynamical pressure encounters small variations,the magnetic field both in space and on the ground does not display similar variations.Therefore,the increase of geomagnetic field in the dawn sector is caused by the southward turning of IMF(interplanetary magnetic field)BZ.These results will help to better understand the coupling process of geomagnetic filed and interplanetary magnetic field. 相似文献
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正Earthquakes,which cause extreme loss of lives and properties,are the most devastating natural disasters on Earth.Scientists have since sought for ways to predict the occurrence of earthquakes and to mitigate its effects.Unfortunately,there is still no effective method for precise predictions.However,among the possible methods for short-term earthquake predictions,one of the most promising is the monitoring of electromagnetic and particle disturbances in the ionosphere,which is based on the theory that couplings exist between the lithosphere and ionosphere. 相似文献
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