A5047803811- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Risk and Safety Analysis
- Solar Radiation and Photovoltaics
- Safety and Risk Management
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Atmospheric Ozone and Climate
- Fire dynamics and safety research
- Optical Systems and Laser Technology
- Reproductive Physiology in Livestock
- Remote-Sensing Image Classification
- Biomedical and Engineering Education
- Fluid Dynamics and Turbulent Flows
- Coastal and Marine Dynamics
- Spacecraft Dynamics and Control
- solar cell performance optimization
- Comparative Animal Anatomy Studies
- Advanced Image Fusion Techniques
- Advanced Multi-Objective Optimization Algorithms
- Maritime Navigation and Safety
Shandong University
2015-2024
National Space Science Center
2024
Chinese Academy of Sciences
2024
Nanchang Institute of Science & Technology
2024
Beijing Institute of Technology
2024
Institute of Space Sciences
2019-2023
Huazhong University of Science and Technology
2016
Armagh Observatory & Planetarium
2012-2013
China People's Police University
2005-2012
Chinese People's Armed Police Force
2005-2012
The term "ultraviolet (UV) burst" is introduced to describe small, intense, transient brightenings in ultraviolet images of solar active regions. We inventorize their properties and provide a definition based on image sequences transition-region lines. Coronal signatures are rare, most bursts associated with small-scale, canceling opposite-polarity fields the photosphere that occur emerging flux regions, moving magnetic features sunspot moats, light bridges. also compare UV similar phenomena...
We present high-resolution observations of a magnetic reconnection event in the solar atmosphere taken with New Vacuum Solar Telescope, AIA and HMI. The occurred between threads twisted arch filament system (AFS) coronal loops. Our reveal that relaxation AFS drives some its to encounter loops, providing inflows reconnection. is evidenced by flared X-shape features images, current-sheet-like feature apparently connecting post-reconnection loops \halpha$+$1 \AA\ small-scale cancellation HMI...
We study the magnetic properties of small-scale transients in coronal hole. found all brightening events are associated with bipolar regions and caused by flux emergence followed cancellation pre-existing newly emerging flux. In hole, 19 22 have a single stable polarity which does not change its position time. eleven cases this is dominant polarity. The hole form largest concentration terms size while opposite distributed small concentrations. number elements four times higher than...
Yao, Y.; Huang, Z.H.; Monismith, S.G., and Lo, E.Y.M., 2013. Characteristics of monochromatic waves breaking over fringing reefs. A reef is a that directly attached to shore. Since reefs resemble plane beaches in some aspects, it important understand the similarities discrepancies between wave beaches. With an idealized (a sloping fore submerged horizontal flat), series laboratory experiments were conducted flume how reef-flat submergence fore-reef slope may affect characteristics The...
We present study of a typical explosive event (EE) at sub-arcsecond scale witnessed by strong non-Gaussian profiles with blue- and red-shifted emission up to 150 km/s seen in the transition-region Si IV 1402.8 \AA, chromospheric Mg II k 2796.4 \AA\ C 1334.5 observed Interface Region Imaging Spectrograph unprecedented spatial spectral resolution. For first time EE is found be associated very small-scale ($\sim$120 km wide) plasma ejection followed retraction chromosphere. These jets originate...
Solar coronal waves frequently appear as bright disturbances that propagate globally from the eruption center in solar atmosphere, just like tsunamis ocean on Earth. Theoretically, can sweep over underlying chromosphere and leave an imprint form of Moreton wave, due to enhanced pressure beneath their wavefront. Despite frequent observations waves, counterparts are rarely detected. Why bears imprints remained a mystery since discovery three decades ago. To resolve this question, all...
Abstract Remote brightening (RB) is compact at footpoints of magnetic loops, which are remotely connecting to and confining an eruption in the solar atmosphere. Here, we report on observations RB resulting from EUV jet with a speed about 90 km s −1 . The loops have apparent length 59 Mm. Intriguingly, exhibits least two episodes brightenings, as characterized by peaks its lightcurve. energies that sustain first second 6.3 × 10 26 erg 8.4 erg, respectively, comprise significant proportion...
Transition-region explosive events (EEs) are characterized by non-Gaussian line profiles with enhanced wings at Doppler velocities of 50-150 km/s. They believed to be the signature solar phenomena that one main contributors coronal heating. The aim this study is investigate link EEs dynamic in transition region and chromosphere an active region. We analyze observations simultaneously taken Interface Region Imaging Spectrograph (IRIS) Si IV 1394\AA\ slit-jaw (SJ) 1400\AA\ images, Swedish 1-m...
Context. We report on the plasma properties of small-scale transient events identified in quiet Sun, coronal holes and their boundaries.
Liquefied natural gas(LNG) has large fire and explosion hazard China's imports of LNG by sea will present rapid growth in the next decade. Analyses were made for fatalness ships. The risk evaluations ship at a different angle use Dow method, BLEVE model VCE model. clear, accurate, comprehensive evaluation findings obtained, which index F&EI is 168 degree 'very large' before security measure compensations, but after falls reduced,. results could be applied as references to scientific...
We report on the first Interface Region Imaging Spectrograph (IRIS) study of cool transition region loops, a class loops that has received little attention in literature. A cluster such was observed solar disk active NOAA11934, Si iv 1402.8 Å spectral raster and 1400 slit-jaw images. divide into three groups their dynamics. The group comprises relatively stable with 382–626 km cross-sections. Observed Doppler velocities are suggestive siphon flows, gradually changing from −10 s−1 at one end...
Abstract How the solar corona is heated to high temperatures remains an unsolved mystery in physics. In present study we analyze observations of 50 whole active region loops taken with Extreme-ultraviolet Imaging Spectrometer on board Hinode satellite. Eleven were classified as cool (<1 MK) and 39 warm (1–2 MK). We their plasma parameters, such densities, temperatures, filling factors, nonthermal velocities, Doppler velocities. combine spectroscopic analysis linear force-free magnetic...
Solar Optical Telescope onboard Hinode observed a sunspot (AR 11836) with two light bridges (LBs) on 31 Aug 2013. We analysed 2-hour \ion{Ca}{2} H emission intensity data set and detected strong 5-min oscillation power both LBs in the inner penumbra. The time-distance plot reveals that phase does not vary significantly along thin bridge, indicating oscillations are likely to originate from underneath. slit taken central axis of wide bridge exhibits standing wave feature. However, at centre...
Quasi-periodic propagating disturbances (PDs) are ubiquitous in polar coronal holes on the Sun. It remains unclear as to what generates PDs. In this work, we investigate how PDs generated solar atmosphere by analyzing a fourhour dataset taken Atmospheric Imaging Assembly (AIA) board Solar Dynamics Observatory (SDO). We find convincing evidence that spicular activities transition region seen AIA 304 {\AA} passband responsible for corona revealed 171 images. conclude spicules an important...
Connecting in-situ measured solar-wind plasma properties with typical regions on the Sun can provide an effective constraint and test to various solar wind models. We examine statistical characteristics of origin in different types source regions. find that speed distribution coronal hole (CH) is bimodal slow peaking at ~400 km/s a fast ~600 km/s. An anti-correlation between speeds O7+/O6+ ion ratio remains valid all three as well during studied cycle activity phases, i.e. maximum, decline...
Coronal jets are ubiquitous in active regions (ARs) and coronal holes. In this paper, we study a jet related to C3.4 circular-ribbon flare region 12434 on 2015 October 16. Two minifilaments were located under 3D fan-spine structure before flare. The was generated by the eruption of one filament. kinetic evolution divided into two phases: slow rise phase at speed $\sim$131 km s$^{-1}$ fast $\sim$363 plane-of-sky. may correspond impulsive reconnection breakout current sheet. magnetic...
Two main models have been developed to explain the mechanisms of release, heating and acceleration nascent solar wind, wave-turbulence-driven (WTD) reconnection-loop-opening (RLO) models, in which plasma release processes are fundamentally different. Given that statistical observational properties helium ions produced magnetically diverse regions could provide valuable information for wind modelling, we examine abundance (A_He) speed difference between protons (v_alpha,p) coronal holes...
We study a sequence of eruptive events including filament eruption, GOES C4.3 flare and coronal mass ejection. aim to identify the possible trigger(s) precursor(s) destabilisation; investigate kernel characteristics; ribbons/kernels formation evolution; interrelation filament-eruption/flare/coronal-mass-ejection phenomena as part integral active-region magnetic field configuration; determine H\alpha\ line profile evolution during phenomena. Multi-instrument observations are analysed...
Abstract Coronal jets are always produced by magnetic reconnection between emerging flux and pre-existing overlying fields. When the field is vertical/oblique or horizontal, coronal jet will appear as anemone type two-sided-loop type. Most observational of type, only a few have been reported. Using high-quality data from New Vacuum Solar Telescope, Interface Region Imaging Spectrograph , Dynamics Observatory we present an example simultaneously observed in chromosphere, transition region,...
Feature selection (FS) is a classic and challenging optimization task in most machine learning data mining projects. Recently, researchers have attempted to develop more effective methods by using metaheuristic FS. To increase population diversity further improve the effectiveness of beluga whale (BWO) algorithm, this paper, we propose multi-strategies improved BWO (MSBWO), which incorporates circle mapping dynamic opposition-based (ICMDOBL) initialization as well elite pool (EP),...