A5002199905- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Gamma-ray bursts and supernovae
- Solar Radiation and Photovoltaics
- Stellar, planetary, and galactic studies
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Earthquake Detection and Analysis
- Infrared Target Detection Methodologies
- Currency Recognition and Detection
- GNSS positioning and interference
- Particle accelerators and beam dynamics
- Autopsy Techniques and Outcomes
- IoT Networks and Protocols
- Smart Grid Security and Resilience
- Spacecraft Design and Technology
- Inertial Sensor and Navigation
- Electromagnetic Compatibility and Measurements
- Smart Agriculture and AI
- Satellite Communication Systems
- Artificial Immune Systems Applications
- Pulsars and Gravitational Waves Research
- Antenna Design and Optimization
China Telecom (China)
2025
Shandong University
2015-2024
National Space Science Center
2011-2024
Chinese Academy of Sciences
2011-2024
Chinese Academy of Meteorological Sciences
2011-2016
University of Chinese Academy of Sciences
2006-2013
Weihai Science and Technology Bureau
2009-2010
It has been suggested that type II radio bursts are due to energetic electrons accelerated at coronal shocks. Radio observations, however, have poor or no spatial resolutions pinpoint the exact acceleration locations of these electrons. In this paper, we discuss a promising approach infer electron location by combining and white light observations. The key assumption is relate specific morphological features (e.g., spectral bumps) dynamic spectra imaging mass ejection (CME) going into...
ABSTRACT The fundamental mechanism initiating coronal mass ejections (CMEs) remains controversial. One of the leading theories is magnetic breakout, in which reconnection occurring high corona removes confinement on an energized low-corona structure from overlying field, thus allowing it to erupt. Here, we report critical observational evidence this elusive breakout a multi-polar configuration that leads CME and X-class, long-duration flare. Its occurrence supported by presence pairs heated...
Simultaneous radio and extreme ultraviolet (EUV)/white-light imaging data are examined for a solar type II burst occurring on 2010 March 18 to deduce its source location. Using bow-shock model, we reconstruct the three-dimensional EUV wave front (presumably type-II-emitting shock) based of two Solar TErrestrial RElations Observatory spacecraft. It is then combined with Nançay infer position source. found that coincides interface between coronal mass ejection (CME) nearby ray structure,...
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...
To address challenges in remote sensing images, such as the abundance of buildings, difficulty contour extraction, and slow update speeds, a high-resolution image building segmentation extraction method based on YOLOv5ds network structure was proposed using Gaofen-2 images. This method, named YOLOv5ds-RC, comprises three primary components: target detection, semantic segmentation, edge optimization. In module, an upsampling multiple convolutional layers branch out from second feature fusion...
With the continuous improvement of national economy, development power enterprises is gradually accelerating, and popularity smart grids also increasing. The grid data center contains a large amount user data, analyzing this can help companies predict load plants, thereby improving resource utilization efficiency enterprises. However, current forecasting models still suffer from information leakage inaccurate predictions during transmission, storage, analysis processes. To solve above...
In recent studies, we proposed that source properties of type II radio bursts can be inferred through a causal relationship between the special shape dynamic spectrum (e.g., bump or break) and simultaneous extreme ultraviolet (EUV)/white light imaging observations CME-shock crossing streamer structures). As further extension these in this paper examine coronal mass ejection (CME) event on 2007 December 31 associated with multiple burst. We identify presence two spectral features observed...
Spacecraft data on immense solar coronal mass ejection (CME) combined with numerical magnetohydrodynamic simulations reveals for the first time both merging of magnetic islands in a CME's trailing current sheet and associated electron acceleration.
Abstract Source imaging of solar radio bursts can be used to track energetic electrons and associated magnetic structures. Here we present a combined analysis data at different wavelengths for an eruption with moving type IV (t-IVm) burst. In the inner corona, sources are correlated hot twisted eruptive EUV structure, while in outer top front bright core white-light coronal mass ejection (CME). This reveals potential using t-IVm continuously CME by lighting up specific component containing...
Plasma blobs are observed to be weak density enhancements as radially stretched structures emerging from the cusps of quiescent coronal streamers. In this paper, it is suggested that formation a consequence an intrinsic instability streamers occurring at very localized region around cusp. The evolutionary process instability, revealed in our calculations, can described follows: (1) through cusp where field too sustain confinement, plasmas expand and stretch closed lines outward result...
We present a novel method to evaluate the Alfven speed and magnetic field strength along streamer plasma sheet in outer corona. The is based on recent observations of waves, which are regarded as fast kink body mode carried by structure generated upon impact CME (coronal mass ejection) nearby streamer. propagates outwards with phase consisting two components. One rest frame, other solar wind streaming sheet. former can be well represented outside sheet, according linear wave dispersion...
We discuss an intriguing type II radio burst that occurred on 2011 March 27. The dynamic spectrum was featured by a sudden break at about 43 MHz the well-observed harmonic branch. Before break, drifted gradually with mean rate of -0.05 MHz/s. Following jumped to lower frequencies. post-break emission lasted for three minutes. It consisted overall slow drift which appeared have few fast sub-bands. Simultaneous observations from Solar TErrestrial RElations Observatory (STEREO) and Dynamics...
Two solar type II radio bursts, separated by ∼24 hr in time, are examined together. Both events associated with coronal mass ejections (CMEs) erupting from the same active region (NOAA 11176) beneath a well-observed helmet streamer. We find that emissions both ended once CME/shock fronts passed white-light streamer tip, which is presumably magnetic cusp of This leads us to conjecture closed arcades may play role electron acceleration and excitation at shocks. To examine such conjecture, we...
ABSTRACT Hot-channel (HC) structure, observed in the high-temperature passbands of Atmospheric Imaging Assembly/ Solar Dynamic Observatory , is regarded as one candidate coronal flux rope that an essential element solar eruptions. Here, we present first radio imaging study HC structure metric wavelength. The associated emission manifests a moving type-IV (t-IVm) burst. We show sources co-move outward with HC, indicating t-IV emitting energetic electrons are efficiently trapped within...
Abstract Since fast head-on coronal mass ejections and their associated shocks represent potential hazards to the space environment of Earth even other planets, forecasting arrival time corresponding interplanetary shock is a priority in weather research prediction. Based on radio spectrum observations 16-element array Daocheng Solar Radio Telescope (DSRT), flagship instrument Meridian Project China, during its construction, this study determines initial speed type II solar burst 2022 April...
Band split of solar type II radio bursts, discovered several decades ago, is a fascinating phenomenon with the type-II lanes exhibiting two almost-parallel sub-bands similar morphology. The underlying mechanism remains elusive. One popular interpretation that splitting bands are emitted from shock upstream and downstream, respectively, their frequency ratio ({\gamma}) determined by compression ratio. This has been taken as physical basis for many published references. Here we report an...
In many type II solar radio bursts, the fundamental and/or harmonic branches of bursts can split into two almost parallel bands with similar spectral shapes and frequency drifts. However, mechanisms accounting for this intriguing phenomenon remain elusive. study, we report a special band-splitting event in which features appear systematically earlier on upper band (with higher frequencies) than lower by several seconds. Furthermore, emissions carried splitting are moderately polarized...
With a test-particle simulation, we investigate the effect of large-scale coronal magnetic fields on electron acceleration at an outward-propagating shock with circular front. The field is approximated by analytical solution streamer-like featured partially open and current sheet equator atop closed region. We show that shock-field configuration, especially relative curvature line across which sweeping, plays important role in efficiency acceleration. At low altitudes, when larger than...