A5053237628- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Earthquake Detection and Analysis
- Planetary Science and Exploration
- Magnetic confinement fusion research
- Atmospheric Ozone and Climate
- Geophysics and Gravity Measurements
- Plasma Diagnostics and Applications
- Dust and Plasma Wave Phenomena
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- Space Science and Extraterrestrial Life
- Electromagnetic Launch and Propulsion Technology
- Gyrotron and Vacuum Electronics Research
- Seismic Waves and Analysis
- Semiconductor materials and devices
- Laser-induced spectroscopy and plasma
- GNSS positioning and interference
- Scientific Research and Discoveries
- Magnetic Field Sensors Techniques
- Physics of Superconductivity and Magnetism
- Analytical Chemistry and Sensors
- Geology and Paleoclimatology Research
Peking University
2015-2024
John Wiley & Sons (United States)
2015
Charles River Laboratories (Netherlands)
2015
Chinese Academy of Sciences
2011
Goddard Space Flight Center
2010
Max Planck Institute for Solar System Research
2005
Beijing City University
2005
Max Planck Society
2001
Energetic electron and ion (electrons: 30 keV to 500 keV, protons: 1.5 MeV) flux variations associated with ultralow frequency (ULF) waves in the dayside magnetosphere were observed during CLUSTER's perigee pass near 0900 MLT on Oct. 31, 2003. The ULF modulation terminated where higher fluctuations appeared, as CLUSTER spacecraft entered plasmasphere boundary layer (PBL) plasma density was elevated. In region from L ∼ 5.0 10, periods of are same but out‐of‐phase. magnetic pulsations...
The interaction between interplanetary shocks and the Earth's magnetosphere manifests in many important space physics phenomena including particle acceleration. We investigated response of inner magnetospheric hydrogen oxygen ions to a strong shock impinging on magnetosphere. Both are found be heated/accelerated significantly with their temperature enhanced by factor two three immediately after ∼1 min ∼12 arrival respectively. Multiple energy dispersion signatures were parallel anti‐parallel...
Abstract Radiation belt electrons can exhibit different types of pitch angle distributions in response to various magnetospheric processes. Butterfly distributions, characterized by flux minima at angles around 90°, are broadly observed both the outer and inner belts slot region. close boundary have been attributed drift shell splitting losses magnetopause. However, their occurrence region has hitherto not resolved. By analyzing particle wave data collected Van Allen Probes during a...
When a solar wind dynamic pressure impulse impinges on the magnetophere, ultra‐low‐frequency (ULF) waves can be excited in magnetosphere and energy transported from interplanetary space into inner magnetosphere. In this paper, we have systematically studied ULF at geosynchronous orbit by both positive negative pulses. We identified 270 events pulses 254 1 January 2001 to 31 March 2009. found that poloidal toroidal oscillate similar manner of phase near 06:00 local time (LT) 18:00 LT, but...
An understanding of the transport solar wind plasma into and throughout terrestrial magnetosphere is crucial to space science weather. For non-active periods, there little agreement on where how entry might occur. Moreover, behaviour in high-latitude region behind magnetospheric cusps, for example, lobes, poorly understood, partly because lack coverage by previous missions. Here, using Cluster multi-spacecraft data, we report an unexpected discovery regions Earth's tailward cusps. From...
We present small and meso‐scale properties of a substorm onset arc observed simultaneously by the Reimei THEMIS satellites together with ground‐based observations GBO system. The optical revealed slow equatorward motion growth‐phase development much brighter poleward it. Both arcs showed typical particle signature electrostatic acceleration in an inverted‐V structure strong Alfvén wave at edge arc. Two spacecraft encountered earthward flow bursts around times expanding aurora reached their...
Interplanetary (IP) shocks can greatly disturb the Earth's magnetosphere, causing global dynamic changes in electromagnetic fields and plasma. In order to investigate this, we have systematically analyzed 106 IP shock events based on OMNI data, GOES, Los Alamos National Laboratory satellite observations during 1997−2007. It is revealed that median value of IMF B z keeps negative/positive prior arrival becomes more following arrival. The statistical analysis shows with southward...
This paper presents THEMIS measurements of two substorm events to show how the current wedge (SCW) is generated. In late growth phase when an earthward flow burst in near‐Earth magnetotail brakes and diverted azimuthally, pressure gradients X‐ Y‐directions are observed increase pileup diverting regions flow. The enhanced gradient Y‐direction dawnward (duskward) on dawnside (duskside) where a clockwise (counter‐clockwise) vortex forms. dawn‐dusk drives downward (upward) field‐aligned (FAC)...
Magnetic holes (MHs), with a scale much greater than \r{ho}i (proton gyroradius), have been widely reported in various regions of space plasmas. On the other hand, kinetic-size magnetic (KSMHs), previously called small size (SSMHs), order magnitude or less only Earth's magnetospheric plasma sheet. In this study, we report such KSMHs magnetosheath whereby use measurements from Magnetospheric Multiscale (MMS) mission, which provides three-dimensional (3D) particle distribution resolution...
Abstract Quasi‐linear theory (QLT) has been commonly used to study the Landau resonant interaction between radiation belt electrons and magnetosonic (MS) waves. However, long‐parallel wavelengths of MS waves can exceed their narrow spatial confinement cause a transit‐time effect during interactions with electrons. We perform careful investigation validate applicability QLT waves, which have distribution in frequency wave normal angle, using test particle simulations. show agreement these two...
Abstract. Magnetic holes with relatively small scale sizes, detected by Cluster and TC-1 in the magnetotail plasma sheet, are studied this paper. It is found that these magnetic spatial structures they not depressions generated flapping movement of current sheet. Most (93%) were observed during intervals Bz larger than Bx, i.e. more likely to occur a dipolarized field topology. Our results also suggest occurrence might have close relationship dipolarization process. The typically size...
Abstract We report the in situ observation of a plasma vortex induced by solar wind dynamic pressure enhancement nightside sheet using multipoint measurements from Time History Events and Macroscale Interactions during Substorms (THEMIS) satellites. The has scale 5–10 Re propagates several downtail, expanding while propagating. features are consistent with prediction Sibeck (1990) model, can penetrate deep (~8 ) dawn‐dusk direction couple to field line oscillations. Global...
Abstract We present in situ observations of a shock‐induced substorm‐like event on 13 April 2013 observed by the newly launched Van Allen twin probes. Substorm‐like electron injections with energy 30–500 keV were region from L ∼5.2 to 5.5 immediately after shock arrival (followed energetic drift echoes). Meanwhile, flux was clearly and strongly varying ULF wave time scale. It is found that both toroidal poloidal mode waves period 150 s emerged following magnetotail magnetic field...
Abstract We study electron behavior in the outer radiation belts during 16 July 2017 storm sudden commencement (SSC), which prompt intensification of ultrarelativistic fluxes was observed at around L = 4.8 by Van Allen Probe B immediately after an interplanetary shock. The multiple energy channels show clear oscillations Pc5 frequency range, although oscillation characteristics are quite different channels. At energies above ∼1 MeV, periods were very close to drift period, resembles...
Abstract We perform a statistical study of flux ropes and reconnection fronts based on MErcury Surface, Space ENviroment, GEochemistry, Ranging (MESSENGER) magnetic field plasma observations to the implications for spatial distribution sites in Mercury's near magnetotail. The results show important differences temporal distributions as compared Earth. have surveyed sheet crossings between −2 R M −3 downtail from planet, i.e., location Near‐Mercury Neutral Line (NMNL). Plasma sheets were...
In the analysis of in-situ space plasma and field data, an establishment coordinate system frame reference, helps us greatly simplify a given problem provides framework that enables clear understanding physical processes by ordering experimental data. For example, one most important tasks data is to compare with simulations theory, which facilitated appropriate choice reference frame. While in theoretical work (generally based on dimensionality or dimension number quantities being studied)...
Abstract Tides are universal and affect spatially distributed systems, ranging from planetary to galactic scales. In the Earth–Moon system, effects caused by lunar tides were reported in Earth’s crust, oceans, neutral gas-dominated atmosphere (including ionosphere) near-ground geomagnetic field. However, whether a tide effect exists plasma-dominated regions has not been explored yet. Here we show evidence of tide-induced signal plasmasphere, inner region magnetosphere, which is filled with...
In this study, we report in situ observations on the simultaneous periodic modulations drifting energetic electrons (∼100 keV) and bouncing thermal ion species (O + at ∼4.5 keV H ∼280 eV) with same frequency of 3.3 mHz during storm recovery phase 21 October 2001. The Cluster fleet was traveling outbound inner magnetosphere from Southern to Northern Hemisphere morning sector (0900 MLT). ultra‐low‐frequency (ULF) waves magnetic field electric measurements show a mixture several dominant wave...
Sudden impulses (SIs) are an important source of ultra low frequency (ULF) wave activity throughout the Earth's magnetosphere. Most SI‐induced ULF events have been reported in dayside magnetosphere; it is not clear when and how SIs drive nightside plasma sheet. We examined response sheet to using ensemble 13 SI observed by THEMIS (Timed History Events Macroscale Interactions during Substorms) satellites (probes). Only three these resulted activity. The periods waves found be 3.3, 6.0, 7.6...
On 14 June 2007, four Time History of Events and Macroscale Interactions during Substorms spacecraft observed a flux transfer event (FTE) on the dayside magnetopause, which has been previously proved to be generated by multiple, sequential X‐line reconnection (MSXR) in 2‐D context. This paper reports further study MSXR show 3‐D viewpoint based additional measurements. The structure FTE rope across magnetospheric boundary is obtained basis multipoint measurements taken both sides...
Abstract Recently, observational results on currents around the dipolarization fronts (DFs) of earthward flow bursts have attracted much research attention. These are found to close association with substorm intensifications. This paper devotes further study current system ahead and within DFs high‐resolution magnetic field measurements from Cluster constellation in 2003. The separation four spacecraft is smaller than scales spatial structures DF layer so that can be reliably obtained. Based...
Current densities associated with dipolarization fronts (DFs) have been calculated in the geomagnetic tail using curlometer technique applied to high‐resolution magnetic field data obtained by four Cluster spacecraft. We then use relation characterize behavior of field‐aligned current (FAC) during 25 DF events. Our results show that magnitude FAC density ( J // ) ranges from 5 20 nA/m 2 , and they are observed Northern Southern Hemispheres flowing along both directions ‐field. The FACs...
Abstract We present an analysis of “boomerang‐shaped” pitch angle evolutions outer radiation belt relativistic electrons observed by the Van Allen Probes after passage interplanetary shock on 7 June 2014. The flux at different angles is modulated Pc5 waves, with equatorially mirroring reaching satellite first. For 90° electrons, phase change modulations across energy exceeds 180° and increasingly tilts time. Using estimates arrival time particles spacecraft location, a scenario investigated...