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检索条件"作者=A.M.du"

共 121047 条记录，以下是1-10 订阅

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Evaluation of a Revised Interplanetary Shock Prediction model:1D CESE-HD-2 Solar-Wind model

Evaluation of a Revised Interplanetary Shock Prediction Mode...

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Y.Zhang a.m.du D.du W.Sun Key Laboratory of Ionospheric Environment Institute of Geology and GeophysicsChinese Academy of Sciences Beijing National Observatory of Space Environment Institute of Geology and GeophysicsChinese Academy of Sciences National Center for Space Weather China Meteorological Administration Geophysical Institute University of Alaska

We modified the one-dimensional conservation element and solution element(CESE) hydrodynamic(HD) model into a new version[1D CESE-HD-2],by considering the direction of the shock *** real-time performance of the 1D CESE-HD-2model during Solar Cycle 23(February 1997-December 2006) is investigated and compared with those of the Shock Time of Arrival model(STOA),the Interplanetary-ShockPropagation model(ISPm),and the Hakamada-Akasofu-Fry version 2(HAFv.2).Of the total of 584 flare events,173 occurred during the rising phase,166 events during the maximum phase,and 245 events during the declining *** statistical results show that the success rates of the predictions by the 1D CESE-HD-2 model for the rising,maximum,declining,and composite periods are 64%,62%,57%,and 61%,respectively,with a hit window of ± 24 *** results demonstrate that the 1D CESE-HD-2 model shows the highest success rates when the background solar-wind speed is relatively ***,when the background solar-wind speed at the time of shock initiation is enhanced,the forecasts will provide potential values to the customers.A high value(27.08) of x and low p-value(model give considerable confidence for real-time forecasts by using this new ***,the effects of various shock characteristics(initial speed,shock duration,background solar wind,longitude,etc.) and background solar wind on the forecast are also investigated statistically.

关键词： Interplanetary shocks Shock propagation model Arrival time prediction 1D CESE-HD-2 model Space weather

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Comments on "Interplanetary and geomagnetic parameters during January 16-26,2005" by ***

Comments on "Interplanetary and geomagnetic parameters durin...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： a.m.du B.T.Tsurutani W.Sun Institute of Geology and Geophysics Chinese Academy of Sciences Jet Propulsion Laboratory California Institute of TechnologyPasadenaCAUSA Geophysical Institute University of Alaska FairbanksAK 99775USA

We write this note of clarification to show that Kane(2012) has incorrectly interpreted the interplanetary magnetic field during the event by using low time-resolution data,and has thus misinterpreted the concluding comments of du et al.(2008).Our recent paper(du et al.,2011b) has shown that the solar wind energy input during northward ImF events is very *** the interpretation of the du et al.(2008) article given by the authors stand as was stated.

关键词： Geomagnetic storms Northward interplanetary magnetic field Solar wind

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The magnetic local time distribution of ring current during the geomagnetic storm

The magnetic local time distribution of ring current during ...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： X.D.Zhao a.m.du W.Y.Xu Institute of Geology and Geophysics Chinese Academy of Sciences Institute of Geophysics China Earthquake Administration

The magnetic local time distribution of the ring current during 879 geomagnetic storms(identified by SYmH < -30 nT) in the 23rd solar cycle(1996-2006) was investigated by using 23 mid-low latitude ground-based *** sto... 详细信息

The magnetic local time distribution of the ring current during 879 geomagnetic storms(identified by SYmH mid-low latitude ground-based *** storms are divided into eight different classes with a step of 20 nT for the statistical *** each class,the dusk side events,for which the H component minimum located in the dusk sector is mostly corresponding to the UT of minimum SYmH index,are about 59.5% of the total *** the noon side events are about 20.0%,the night side events are about 18.7%, and the dawn side events are about 1.8%.The H component distributions with mLT indicate that the magnetic field disturbance during the magnetic storm events is not only related to the symmetrical ring current,but also to the other current,mainly the partial current.A further statistical study of the dusk side events shows that both the symmetric and partial ring currents enhance accompanied by the increase in the storm class during the main *** the partial ring current makes a greater contribution to the main phase of the *** to the interplanetary parameters,the distinction of the solar wind velocity V is more obvious than the interplanetary magnetic field B for the dusk side events in different *** comparisons between dusk side and other side events in the same class indicate that besides the solar wind velocity V,the interplanetary magnetic field B also affects on the disturbance of ring current on the ground in mLT.

关键词： Ring current Storm magnetic local time magnetic field

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Solar wind dependence of energy coupling between solar wind and magnetosphere during intense northward ImFs

Solar wind dependence of energy coupling between solar wind ...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： H.Luo G.X.Chen a.m.du W.Y.Xu Beijing National Observatory of Space Environment Institute of Geology and GeophysicsChinese Academy of Sciences

We statistically study the solar wind dependence of the magnetospheric activities during intense northward interplanetary magnetic fields(ImFs) events(Bz > 10 nT,last over 3 h).It was found that the energy coupling between solar wind and magnetosphere during intense northward ImFs was mainly controlled by solar wind velocity and ImF clock angle(θ).A northward ImF coupling function was derived based on the dimensional analysis and quantitative analysis of the solar wind parameters and the geomagnetic *** was shown that whenθ>～45°,the energy input increases obviously asθ*** importantly,it was also found that the relative importance between the viscous interaction and the ImF |By| effect in controlling the energy input into the magnetosphere during intense northward ImFs mainly depends on ImF clock *** viscous interaction will outweigh the ImF |By| effect in the northward ImF events with 0 mF events withθ>～75°,the ImF \By\ effect may be more important than the viscous interaction.

关键词： Energy coupling Northward interplanetary magnetic field Viscous interaction ImF |By| effect

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Electron Acceleration in a Dynamically Evolved Current Sheet Under Solar Coronal Conditions

Electron Acceleration in a Dynamically Evolved Current Sheet...

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Shaohua Zhang a.m.du Xueshang Feng Xin Cao Quanming Lu Gengxiong Chen Liping Yang Ying Zhang Key Laboratory of Ionospheric Environment Institute of Geology and GeophysicsChinese Academy of Sciences State Key Laboratory of Space Weather Center for Space Science and Applied ResearchChinese Academy of Sciences School of Earth and Space Sciences University of Science and Technology of China School of Earth and Space Sciences Peking University

Electron acceleration in a drastically evolved current sheet under solar coronal conditions is investigated via the combined 2.5-dimensional(2.5D) resistive magnetohydrodynamics(mHD) and test-particle *** a high magnetic Reynolds number(105),the long,thin current sheet is torn into a chain of magnetic islands,which grow in size and coalesce with each *** acceleration of electrons is explored in three typical evolution phases:when several large magnetic islands are formed(phase 1),two of these islands are approaching each other(phase 2),and almost merging into a "monster" magnetic island(phase 3).The results show that for all three phases electrons with an initial maxwell distribution evolve into a heavy-tailed distribution and more than 20%of the electrons can be accelerated higher than 200 keV within 0.1 second and some of them can even be energized up to meV *** lower-energy electrons are located away from the magnetic separatrices and the higher-energy electrons are inside the magnetic *** most energetic electrons have a tendency to be around the outer regions of the magnetic islands or to appear in the small secondary magnetic *** is the trapping effect of the magnetic islands and the distributions of E that determine the acceleration and spatial distributions of the energetic electrons.

关键词： Solar flare Electron acceleration magnetic reconnection magnetic island Parallel electric field

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Statistical study of small-scale magnetic holes in the upstream regime of the martian bow shock

Statistical study of small-scale magnetic holes in the upstr...

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作者： G.Q.Wang m.Volwerk a.m.du S.D.Xiao m.Y.Wu Y.Q.Chen T.L.Zhang

Small-scale magnetic holes(SSmHs) are frequently observed in the solar wind at 1 AU as well as the terrestrial current sheet and *** kinetic-size structures play an important role in energy dissipation and particle ***,we report the existence of SSmHs in the upstream regime of the martian bow shock and statistically investigate these SSmHs based on 5-year observations of the mars Atmosphere and Volatile EvolutioN(mAVEN) spacecraft.A total of 549 SSmHs are found,

关键词： Statistical study of small-scale magnetic holes in the upstream regime of the martian bow shock

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Experimental evidence of direct penetration of upstream ULF waves from the solar wind into the magnetosphere during the strong magnetic storm of November 9,2004

Experimental evidence of direct penetration of upstream ULF ...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： a.m.du~(a,*),Wen-Yao Xu~a,W.Sun~b a Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,China b Geophysical Institute,University of Alaska Fairbanks,AK,USA

Upstream ULF waves were recorded by the ACE satellite,while the Pc5 ULF waves(geomagnetic pulsations) were simultaneously observed by the GOES12 satellite in the magnetosphere during the big magnetic storm on November 9,*** spectra showed similar structures with the maximum frequency band around 2.20-2.44 *** upstream ULF waves were highly correlated with the Pc5 waves with a correlation coefficient of 0.82 for a time lag of 28.5 *** the interplanetary and the magnetospheric waves had intense radial components with very large-amplitudeδB/B>40%,which indicated characteristic of the compressional ***,variations of the plasma density were in phase with those in the magnetic field,suggesting that they were essentially magnetosonic *** results demonstrated that upstream magnetosonic waves in the solar wind can directly penetrate into the magnetosphere and cause the Pc5 ULF waves during a big magnetic *** penetration of the magnetosonic waves seems to be occurred merely around the noon sector.

关键词： ULF waves Solar wind-magnetosphere coupling Interplanetary shock

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Evidence of strong energetic ion acceleration in the near-Earth magnetotail

Evidence of strong energetic ion acceleration in the near-Ea...

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： H.Luo E.A.Kronberg E.E.Grigorenko m.Frnz P.W.Daly G.X.Chen a.m.du L.m.Kistler Y.Wei Key Laboratory of Ionospheric Environment Institute of Geology and GeophysicsChinese Academy of Sciences max Planck Institute for Solar System Research Space Research Institute Russian Academy of Sciences Space Science Center University of New Hampshire

Until now it is still questionable whether ions are accelerated to energies above 100 keV in the near-Earth current sheet(CS),in the vicinity of a possible near-Earth neutral *** using 11 years of 3-D energetic ion flux data for protons,helium,and oxygen(50keV-1 meV) from the RAPID instrument on board Cluster 4,we statistically study the energetic ion acceleration by investigating ion anisotropies in the near-Earth magnetotail(—20 fR150 keV) ions(protons,He,and O) tend to become higher as the earthward(tailward) plasma bulk flows(measured by Cluster Ion Spectrometry experiment) become *** such periods the presence of a strong acceleration source tailward(earthward) of Cluster spacecraft(S/C) is confirmed by the hardening energy spectra of the earthward(tailward) energetic ion flows.A good statistical correlation between tailward bulk flow,negative Bz,and the tailward anisotropy of energetic ions indicates that the strong ion acceleration might be related to a near-Earth reconnection,which occurred earthward of the Cluster S/*** energetic ion anisotropies do not show a clear dependence on the AE index,which may indicate that the acceleration source(s) for the energetic ions could be spatially localized.

关键词：

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Simulated(STEREO) Views of the Solar Wind Disturbances Following the Coronal mass Ejections of 1 August 2010

Simulated(STEREO) Views of the Solar Wind Disturbances Follo...

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Y.Zhang a.m.du X.S.Feng W.Sun Y.D.Liu C.D.Fry C.S.Deehr m.Dryer B.Zieger Y.Q.Xie Institute of Geology and Geophysics Chinese Academy of Sciences State Key Laboratory of Space Weather National Space Science CenterChinese Academy of Sciences Geophysical Institute University of Alaska Space Sciences Laboratory University of California

Images observed by the twin spacecraft Solar TErrestrial RElations Observatory(STEREO) A and B appear as complex structures for two coronal mass ejections(CmEs)on 1 August ***,a series of sky maps of Thomson-scattered white light by interplanetary coronal mass ejections(ICmEs) on 1 August 2010 are simulated using the Hakamada-Akasofu-Fry(HAF) three-dimensional solar-wind model.A comparison between the simulated images and observations of STEREO-A and-B clarifies the structure and evolution of ICmEs(including shocks) in the observed *** results demonstrate that the simulated images from the H AF model are very useful in the interpretation of the observed images when the ICmEs overlap within the fields of view of the instruments onboard STEREO-A and-B.

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Dependence of the ImF sector structure on the solar dipole tilt angle

Dependence of the IMF sector structure on the solar dipole t...

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中国科学院地质与地球物理研究所2008学术年会

作者： a.m.du,W.Y.Xu,and X.S.Feng 1 Institute of Geology and Geophysics,Chinese Academy of Sciences, Beijing,China. 2 State Key Laboratory for Space Weather,Chinese Academy of Sciences,Beijing,China.

[1]The quasiperiodic variations of the interplanetary magnetic field(ImF) sector structure at the ACE satellite(L1) are investigated using power spectrum *** appears that the two-sector structure of the ImF dominates during the solar maximum, lasting 3 years from 2000 through 2003,and the four-sector structure dominates during the solar activity minimum.A possible explanation is introduced for this phenomenon in which the ImF sector structures vary with the tilt angle of the heliospheric current sheet (HCS) with respect to the solar rotation *** the solar activity maximum,the HCS is perpendicular to the ecliptic *** the spacecrafts at L1 point are expected to pass through the HCS only twice in one solar rotation,which gives rise to the observed two-sector structure of the *** the other hand,during the solar activity minimum,the HCS is nearly parallel to the ecliptic plane,and the polarity of ImF Bx changes several times in one solar rotation due to the wavy nature of the HCS, which may lead to the observed four-sector structure.

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