A5068893174- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- GaN-based semiconductor devices and materials
- Ga2O3 and related materials
- ZnO doping and properties
- Semiconductor materials and devices
- Stellar, planetary, and galactic studies
- Semiconductor materials and interfaces
- Metal and Thin Film Mechanics
- Planetary Science and Exploration
- Solar Radiation and Photovoltaics
- Geophysical and Geoelectrical Methods
- Atomic and Molecular Physics
- Polymer Nanocomposite Synthesis and Irradiation
- Silicon Carbide Semiconductor Technologies
- Ferroelectric and Piezoelectric Materials
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Conducting polymers and applications
- Geophysics and Gravity Measurements
- X-ray Diffraction in Crystallography
- Earthquake Detection and Analysis
- Electronic and Structural Properties of Oxides
Peking University
2005-2025
China University of Geosciences (Beijing)
2012-2025
Southeast University
2025
North University of China
2025
Jilin University
2025
Shannon Applied Biotechnology Centre
2025
Cowi (Denmark)
2025
Guangxi Academy of Sciences
2024
Ministry of Education of the People's Republic of China
2024
Wuhan Ship Development & Design Institute
2020
The fluctuating magnetic helicity is considered an important parameter in diagnosing the characteristic modes of solar wind turbulence. Among them Alfvén-cyclotron wave, which probably responsible for plasma heating, but has not yet been identified from Here, we present possible signatures waves distribution as a function θVB, angle between velocity and local mean field. We use field data STEREO spacecraft to calculate θVB normalized reduced σm. find dominant negative σm 1 s < p 4 (p time...
To determine the wave modes prevailing in solar wind turbulence at kinetic scales, we study magnetic polarization of small-scale fluctuations plane perpendicular to data sampling direction (namely, flow direction, ) and analyze its orientation with respect local background field . As an example, take only measurements made outward sector. When is quasi-perpendicular , find that magnetic-field fluctuations, which have periods from about 1 3 s are extracted a wavelet decomposition original...
Abstract In particular during the descending phase of solar cycle, Alfvén waves in high-speed wind streams are a major form interplanetary disturbances. The fluctuating southward magnetic field (IMF) has been suggested to induce geomagnetic activities through intermittent reconnection at magnetopause. this study, we provide situ observational evidence for dayside magnetopause induced by such waves. Using multipoint conjunction observations, show that IMF B z from is transmitted and amplified...
<i>Aims. <i/>We identify high-frequency Alfvén waves propagating upward in the solar chromosphere and transition region from observation by Solar Optical Telescope (SOT) onboard <i>Hinode<i/>.<i>Methods. <i/>The spicule shape is enhanced through application of a normal radial gradient filter an un-sharp mask on images taken SOT. The displaced position at each height obtained tracing maximum intensity after image processing. dominant wave period FFT method applied to time variations certain...
This work focuses on the relation between electron density and magnetic field strength in solar wind, aims to reveal its compressive nature determine level of compressibility. For this purpose, we choose a period quiet wind data obtained at 1 AU by Cluster C1 satellite. The is derived with sampling time as high 0.2 s from spacecraft-potential measurements made Electric Field Waves instrument. We use wavelet cross-coherence method analyze correlation various scales. find dominant...
The angular distribution of the normalized reduced magnetic helicity density (σrm) in solar wind turbulence reveals two components distinct polarity different angle ranges. This kind two-component σrm may indicate possible wave modes and power spectral densities (PSDs) turbulent fluctuations. Here we model measured by assuming a PSD for Alfvén fluctuations wavevector space, then fit results to observations adjusting pattern distribution. It is found that form PSD, which has major minor...
Semiconducting single-walled carbon nanotube thin films can be obtained by conjugated polymer wrapping sorting technique followed solution deposition and utilized as channel materials of field-effect transistors absorbing layers photodiodes. However, after the process, there are still molecules around nanotubes, remaining between on thin-film surface, which will cause large nanotube-electrode resistance tube-tube resistance. Here, we demonstrate an yttrium oxide coating-and-decoating that...
Recently, small-scale pressure-balanced structures (PBSs) were identified in the solar wind, but their formation mechanism remains unclear. This work aims to reveal dependence of properties PBSs on background magnetic field (B0) direction and thus corroborate situ that forms them. We analyze plasma data obtained by WIND quiet wind at 1 AU. First, we use a developed moving-average method obtain B0(s, t) for every temporal scale (s) each time moment (t). By wavelet cross-coherence analysis,...
6H-SiC (silicon carbide) single crystals containing VSi-VC divacancies are investigated with respect to magnetic and structural properties. We found that an initial increase of disorder leads pronounced ferromagnetic properties at room temperature. Further introduction lowers the saturation magnetization is accompanied onset lattice amorphization. Close threshold full amorphization, also divacancy clusters formed nearly drops zero.
The interaction between interplanetary small-scale magnetic flux ropes and the field in ambient solar wind is an important topic understanding of evolution structures heliosphere. Through a survey 125 previously reported small from 1995 to 2005, we find that 44 them reveal clear signatures Alfvénic fluctuations thus classify as Alfvén wave trains rather than ropes. Signatures reconnection, generally including plasma jet ∼30 km s−1 within rotational region, are clearly present at boundaries...
This work presents in situ solar wind observations of three magnetic clouds (MCs) that contain cold high‐density material when Helios 2 was located at 0.3 AU on 9 May 1979, 0.5 30 March 1976, and 0.7 24 December 1978. In the regions embedded interplanetary coronal mass ejections we find (1) number density protons is higher than other inside cloud, (2) possible existence He + , (3) thermal velocity distribution functions are more isotropic appear to be colder MC, proton temperature lower...
Abstract We investigate the role of perpendicular diffusion in shaping energetic ion spectrum corotating interaction regions (CIRs), focusing on its mass-to-charge ( A / Q ) ratio dependence. simulate a synthetic CIR using EUropean Heliospheric FORecasting Information Asset and model subsequent acceleration transport by solving focused equation incorporating both parallel diffusion. Our results reveal distinct differences spectra between scenarios with without In absence diffusion, near CIRs...
In heterostructures of Cr 2 Ge Te 6 (CGT)/graphene, the anomalous Hall effect is clearly observed through experiments, which caused by spin polarization in graphene induced magnetic proximity effect.
The temperature of lubricating oil plays a pivotal role in determining the performance engines and other machinery, underscoring importance studying its distribution for optimizing engine efficiency. In this study, custom experimental setup was developed to measure transmittance across wavelength range 380 nm 1040 at various temperatures. A novel method proposed compute along light path using transmission spectra. By formulating mathematical model that correlates with intensity, optical...
Abstract This work quantitatively studies the differences of heavy ions among non-Alfvénic slow wind (N-ASSW), classical fast (FSW), and Alfvénic hot (ASSW AHSW) by effect size Kolmogorov–Smirnov statistic. Statistics ACE measurements in solar cycle 23 show that He/O Fe/O ASSW AHSW are significantly similar to those N-ASSW, but distinct from FSW. The mean Fe 16+ /Fe 13+ (AHSW) is middle two values FSW N-ASSW. However, three categories similarly low during minimum. Charges C O different...
Using solar-wind-magnetosphere-ionosphere conjunction observations, we investigate the geomagnetic responses to fluctuating IMF Bz from interplanetary Alfven waves. Interplanetary waves transmit intensified magnetosheath, leading intervals of large magnetic shear angles across magnetopause and reconnection. Such are promptly followed by hundreds nT increases in AE/AU index within 10-20 min. These observations confirmed multiple events corotating interaction region (CIR)-driven storms. To put...
Magnetic reconnection is an important process in astrophysical, space and laboratory plasmas. The magnetic null pair structure theoretically suggested to be a crucial feature of the three‐dimensional reconnection. physics around pair, however, has not been explored combination with field configuration deduced from situ observations. Here, we report identification simultaneous electron dynamics near one observed by four Cluster spacecraft geo‐magnetotail. Further, propose new scenario region,...
The structural, optical, and magnetic properties of Cu-implanted GaN films have been investigated. No secondary phase was found within the resolution limit instrument but lattice defects such as vacancies were present in film. Room temperature ferromagnetism observed with saturation magnetization 0.3μB/Cu atom. field-cooled curves can be well fitted by a Curie-Weiss model standard three-dimensional spin-wave low high ranges, respectively. Our findings indicate that vacancylike should...
[1] Knowledge of multidimensional correlation functions is crucial for understanding the anisotropy turbulence. The two-dimensional (2-D) spatial (SCFs) obtained in previous studies space plasma turbulence were restricted to large-length scales and covered a limited angular domain two-point separation vector with respect mean magnetic field. Here we aim derive 2-D SCFs smaller-length scale nearly full distribution fluctuations number density field magnetosheath We use Cluster four-spacecraft...
Abstract Solar extreme-ultraviolet (EUV) waves generally refer to large-scale disturbances propagating outward from sites of solar eruptions in EUV imaging observations. Using the recent observations Atmospheric Imaging Assembly on board Dynamics Observatory, we report a quasiperiodic wave train at an average speed ∼308 km s −1 . At least five fronts can be clearly identified with period being ∼120 s. These originate coronal loop expansion, which propagates apparent ∼95 , about 3 times...
Recently, small-scale pressure-balanced structures (PBSs) have been studied with regard to their dependence on the direction of local mean magnetic field B0. The present work continues these studies by investigating compressive wave mode forming small PBSs, here for B0 quasi-perpendicular x-axis Geocentric Solar Ecliptic coordinates (GSE-x). All data used were measured WIND in quiet solar wind. From distribution PBSs plane determined temporal scale and angle θxB between GSE-x B0, we notice...