A5066425957- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Earthquake Detection and Analysis
- Astro and Planetary Science
- Methane Hydrates and Related Phenomena
- GNSS positioning and interference
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Laser-induced spectroscopy and plasma
- Plasma Diagnostics and Applications
- Geology and Paleoclimatology Research
- Magnetic confinement fusion research
- Geophysics and Gravity Measurements
- Planetary Science and Exploration
- Vacuum and Plasma Arcs
- Electromagnetic Launch and Propulsion Technology
- Inertial Sensor and Navigation
- Geophysical and Geoelectrical Methods
- Diverse Interdisciplinary Research Innovations
- Clinical Nutrition and Gastroenterology
- Space Science and Extraterrestrial Life
- Magneto-Optical Properties and Applications
- Energy Load and Power Forecasting
- Healthcare Systems and Challenges
Shandong University
2016-2024
Astronomy and Space
2022
Institute of Space Sciences
2020
Institute of Space Science - INFLPR Subsidiary
2020
Weihai Science and Technology Bureau
2020
National Space Science Center
2016-2017
Tokai University
2004-2014
Peking University
2012-2014
National Central University
2009-2011
Japan Aerospace Exploration Agency
2004-2005
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...
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...
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)...
Abstract Using the Cluster data during period from January to April between 2001 and 2006, we find an observation of solar wind entry due magnetic reconnection occurred in terrestrial high‐latitude magnetospheric lobes, tailward cusps under northward interplanetary field (IMF). Occurrence rate events this study is same order as that for orbital interval August October years 2002 2004 reported by Shi et al. (2013). In paper, further role IMF B x y components control plasma based on...
Abstract We provide in situ observations of the transient phenomena dayside magnetosphere during preliminary impulse (PI) and main (MI) event on 30 September 2008. The PI MI geomagnetic signals are induced by twin traveling convection vortices with opposite polarities equivalent ionospheric currents due to a sudden increase solar wind dynamic pressure. two PI‐associated current centered at ~07 magnetic local time (MLT), 67° latitude (MLAT) dawnside ~14 MLT, 73°MLAT duskside, respectively....
Abstract The conventional Grad–Shafranov (GS) method is designed to reconstruct a two-dimensional magnetohydrostatic structure with isotropic pressure. In this work, we developed new GS solver (GS-like) that includes the effect of pressure anisotropy based on reduced equations from Sonnerup et al. benchmarked, and results are compared two other solvers Teh. This applied Pc5 compressional wave event, which has mirror-like features significant ( p ⊥ / ∥ ∼ 1.5, where thermal pressures...
Abstract Ultralow frequency (ULF) waves play an important role in the transport of solar wind energy to magnetosphere. In this paper, we present a ULF wave event dayside magnetosphere which shows sudden decrease from 3.1 2.3 mHz around 0756 UT on 11 January 2010, when dynamic pressure drop (from ∼5 ∼2 nPa) was observed simultaneously. The exits globally. phase differences between electric and magnetic fields indicate that compressional mode is standing before after decrease. This result...
Abstract Kelvin‐Helmholtz waves (KHWs), which have been widely observed at the magnetopause in region near Earth, play an essential role transport of solar wind plasma and energy into magnetosphere under dominantly northward interplanetary magnetic field (IMF) conditions. In this study, we present simultaneous observations KHWs IMF by both Acceleration, Reconnection, Turbulence, Electrodynamics Moon's Interaction with Sun (ARTEMIS) spacecraft Earth's magnetotail around lunar orbit (at X ~...
Abstract A transpolar arc (TPA), which extended from postmidnight to prenoon, was seen on 16 September 2001 in the Northern Hemisphere under northward interplanetary magnetic field (IMF)‐B z and weakly dawnward IMF‐B y conditions. Super Dual Auroral Radar Network detected significant westward plasma flows just equatorward of poleward edge midnight sector auroral oval. These were confined closed lines are identified as ionospheric flow signature tail reconnection during IMF nonsubstorm...
Abstract The Advanced Small Analyzer for Neutrals (ASAN) on board the Chang’E-4 Yutu-2 rover first detected energetic neutral atoms (ENAs) originating from lunar surface at various local times farside. In this work, we examine ENA energy spectra, obtained in 23 days 2019 January 11 to 2020 October 12, and find a higher differential flux dawnside than duskside. Combined with Acceleration, Reconnection, Turbulence Electrodynamics of Moon’s Interaction Sun (ARTEMIS) data, analyze correlation...
Abstract The cold‐dense plasma sheet (CDPS) plays an important role in the entry process of solar wind into magnetosphere. Investigating seasonal variation CDPS occurrences will help us better understand long‐term exchange between and magnetosphere, but any has not yet been reported literature. In this paper, we investigate occurrence rate using Geotail data from 1996 to 2015 find a semiannual occurrences. Given higher probability under stronger northward interplanetary magnetic field (IMF)...
[1] The magnetopause is the boundary where reduced solar wind dynamic pressure equal to magnetic of Earth's outer magnetosphere. With hundreds crossings identified from THEMIS data, we estimate a ratio (f) compressed field just inside subsolar purely dipolar field. Previous theoretical studies reported that f was nearly independent standoff distance (r0). Here report linearly proportional r0 for both northward and southward interplanetary (IMF). The proportionality constant IMF larger than...
Abstract We investigate the magnetic forces (the pressure gradient force, curvature and their sum j × B ‐force) associated with earthward bursty bulk flows (BBFs) using Magnetospheric Multiscale (MMS) data from five tail seasons (2017–2021). For first time, are inferred downtail of XGSM = −20 R E in GSM XY YZ planes. The results suggest that BBFs tend to be accelerated by force tailward ∼19 decelerated closer distance 2017–2018 data. magnitudes increase distance. This is accordance earlier...
Abstract We statistically investigate convective earthward fast flows using data measured by the Magnetospheric Multiscale mission in tail plasma sheet during 2017–2021. focus on “frozen in” and importance of different electric field components Sun‐Earth ( V ⊥ x ) dusk‐dawn y velocity perpendicular to magnetic field. find that a majority flow events (52% 429) have north‐south component E z as most relevant or dominating whereas 26% are so‐called conventional type with components. The rest...
With unique simultaneous observations both in the magnetosheath and magnetosphere by THEMIS probes, Alfvénic variations plasma velocity are observed at inner edge of low‐latitude boundary layer (LLBL) induced mirror mode waves near subsolar magnetopause on 31 July 2007. These appeared as wavy perturbations V x y components C, D, E, which had same periodicity associated magnetic field variations. Simultaneously, B magnetosheath. The periodicities pressure modes were consistent with those...
Abstract The terrestrial magnetosphere is perpetually exposed to and significantly deformed by the interplanetary magnetic field (IMF) in solar wind. This deformation typically detected at discrete locations space‐ ground‐based observations. Earth's aurora, on other hand, a globally distributed phenomenon that may be used elucidate magnetospheric deformations caused IMF variations, as well plasma supply from magnetotail high‐latitude atmosphere. We report utilization of an auroral form known...
The GEOTAIL satellite observed an interesting oscillation phenomenon of low energy plasma (LEP) in the dawnside outer magnetosphere. was taking place with a frequency double that transverse Pc 5 pulsations. double-frequency appeared density and temperature, clearly showing out-of-phase relationship between them. However, this is revealed to be instrumental effect LEP detector, which has threshold measuring ion population at 32 eV/Q. imbedded found composed cold ions less than threshold. They...
Abstract Although compressional Pc5 waves are well known in the energy conversion and regulation of charged particles magnetosphere, detailed features associated electron pitch angle distributions (ePADs) poorly understood. Based on Time History Events Macroscale Interactions during Substorms (THEMIS) observations from 2010 to 2016, ePADs magnetic decreases (troughs) classified into three types: cigar, butterfly, pancake. They found electrons with respective ranges 100–1,000 eV (larger than...
Abstract In this paper, we present a case study of the radial interplanetary magnetic field (IMF B x )‐induced asymmetric solar wind‐magnetosphere‐ionosphere (SW‐M‐I) coupling between northern and southern polar caps using ground‐based satellite‐based data. Under prolonged conditions strong earthward IMF on 5 March 2015, find significant discrepancies cap north (PCN) south (PCS) indices with negative bay‐like change in PCN positive PCS. The difference these (PCN‐PCS) reaches minimum −1.63...
Abstract The density of the solar wind plasma near Earth’s magnetosphere sometimes decreases to only several per cent usual value, and such extrema result in a significant reduction dynamic pressure Alfvén Mach number ( $$M_A$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>M</mml:mi> <mml:mi>A</mml:mi> </mml:msub> </mml:math> ) flow. While symmetric expansion by low was assumed previous studies, global magnetohydrodynamic (MHD) simulation study predicted...
Abstract In this paper, we provide statistical evidence that the level of solar wind‐magnetosphere‐ionosphere (SW‐M‐I) coupling is weaker under radial (Sun‐Earth component dominant) interplanetary magnetic field (IMF) conditions than non‐radial IMF conditions. This performed by analyzing auroral electrojet activity (using SuperMAG indices) in sunlit and dark ionospheres for long‐duration (at least 4 hr) events comparing against same azimuthal (dusk‐dawn events. We show north‐south (IMF B z )...
We examined the magnetospheric magnetic field and plasma responses to an encounter of a discontinuity in B x component interplanetary (IMF). The striking variations simultaneous solar wind dynamic pressure IMF‐B z were not observed. Furthermore, we found that this was heliospheric current sheet, separating two high‐speed streams with different velocity polarity. In study, data obtained from Time History Events Macroscale Interactions during Substorms (THEMIS), Cluster, GOES investigate...