A5100328057- Solar and Space Plasma Dynamics
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Gas Dynamics and Kinetic Theory
- Laser-Plasma Interactions and Diagnostics
- Particle Dynamics in Fluid Flows
- Astro and Planetary Science
- High-pressure geophysics and materials
- Stellar, planetary, and galactic studies
- Space Satellite Systems and Control
- Transportation Safety and Impact Analysis
- Oil, Gas, and Environmental Issues
- Astronomical Observations and Instrumentation
- Astronomy and Astrophysical Research
- Laser-Matter Interactions and Applications
- Laser-induced spectroscopy and plasma
- Particle accelerators and beam dynamics
- Space exploration and regulation
- Astrophysics and Star Formation Studies
- Planetary Science and Exploration
- Electromagnetic Launch and Propulsion Technology
- Structural Engineering and Vibration Analysis
- Neutrino Physics Research
- Magnetic confinement fusion research
Xinjiang Astronomical Observatory
2013-2025
Chinese Academy of Sciences
2010-2022
China Academy of Launch Vehicle Technology
2020
Nanjing University
2016-2019
University of Arizona
2017-2019
National Astronomical Observatories
2013-2019
High Altitude Observatory
2012-2014
NSF National Center for Atmospheric Research
2012-2014
Peking University
2012-2014
Shanghai Institute of Optics and Fine Mechanics
2010
Solar eruptions, particularly coronal mass ejections (CMEs) and extreme-ultraviolet (EUV) jets, have rarely been investigated with spectroscopic observations. We analyze several data sets obtained by the EUV Imaging Spectrometer on board Hinode find various types of flows during CMEs jet eruptions. CME-induced dimming regions are found to be characterized significant blueshift enhanced line width using a single Gaussian fit, while red–blue (RB) asymmetry analysis an RB-guided double fit...
Line-of-sight magnetograms from the Helioseismic and Magnetic Imager (HMI) of Solar Dynamics Observatory (SDO) are analyzed using a diagnostic known as "Magnetic Range Influence," or MRoI. The MRoI is measure length over which photospheric magnetogram balanced so its application gives user sense connective scales in outer solar atmosphere. maps histograms inferred SDO/HMI primarily exhibit four scales: scale few megameters that can be associated with granulation, tens super-granulation, many...
Collisionless diffusive shock waves are the primary mechanism for production of high energy particles in Sun, with solar flare terminal located lower atmosphere providing seed generation particles. Whether shocks can trigger ground-level enhancement events energies reaching GeV remains a mystery. Solar cosmic ray particle streams play crucial role space weather environment, and heliospheric plasma bubble, at ranges typically exhibit single power law spectra, while higher ranges, often have...
<title>Abstract</title> This study investigates particle acceleration mechanisms in a twin-flare-jet shock scenario, revealing three-stage process driven by interactions. Initially, Shock No.1 generates normal power-law spectrum, followed re-acceleration from No.2, which hardens the spectrum and introduces concave feature between 1 MeV 20 MeV. The merged dual-shock system further accelerates particles, producing high-energy tail up to 30 These findings align with observations of Ground-Level...
Abstract We draw a multimessenger picture of J1048+7143, flat-spectrum radio quasar known to show quasiperiodic oscillations in the γ -ray regime. generate adaptively binned Fermi Large Area Telescope light curve this source above 168 MeV find three major flares source, such that each consists two sharp subflares. Based on interferometric imaging data taken with Very Array, we kiloparsec-scale jet is directed west, while our analysis 8.6 GHz very long baseline interferometry data, mostly...
Abstract Ground-level enhancement (GLE) events are often associated with large gradual solar such as fast coronal mass ejections (CMEs), but not all CMEs lead to GLE events. Is there a type of coordinated CME that could produce GLEs larger intensity and higher energies than those in the normal isolated CMEs? Here we propose twin-shock scenario driven by twin coordinately, which posterior shock catches up preceding has pileup collision. In present study, chose first event cycle 24 occurring...
Although non-linear diffusive shock acceleration could be simulated by some well-established models, the particle injection rate is a priori assumed to proceed from thermal particles superthermal population in models that use numerical simulations. In order investigate effect of anisotropy scattering on rate, we present dynamical Monte Carlo simulation bow Earth with different dispersions pitch-angle scattering. Since intrinsically defined prescribed law approach, can directly study...
Abstract Astrophysical jets are ubiquitous in the universe and often associated with compact objects, their interactions ambient medium not only dissipate own energy but also provide ideal circumstances for particle acceleration. By means of theoretical analysis particle-in-cell simulations, here we study ion acoustic shock wave (IASW) formation consequent acceleration when electron–positron ( e − + ) injected into electron–ion plasmas. It is found that Buneman instability can be excited...
Galkin et al. [Phys. Plasmas 15, 023104 (2008)] presented the comparison of electron dynamics in cases linear and circular polarizations optical fields. They assume that longitudinal component laser field can be neglected case displacement less than Rayleigh range. In this comment, we point out must considered for minimum spot size 10 times wavelength linearly polarized pulse 15 circularly pulse.
Observations by spacecraft such as ACE, STEREO, and others show that there are proton spectral "breaks" with energy Ebr at 1–10 MeV in some large CME-driven shocks. Generally, a single shock the diffusive acceleration mechanism would not predict "broken" spectrum. The present paper focuses on two converging shocks to identify this feature. In case, comprise one forward 2006 December 13 another backward Earth bow shock. We simulate detailed particle processes region of using Monte Carlo...
Observations from multiple spacecraft show that there are energy spectral "breaks" at 1-10MeV in some large CME-driven shocks. However, numerical models can hardly simulate this property due to high computational expense. The present paper focuses on analyzing these by Monte Carlo particle simulations of an isolated shock. Taking the Dec 14 2006 shock as example, we investigate formation property. For purpose, apply different values for scattering time our model obtain highest "tails", which...
Observations show that there is a proton spectral "break" with E$_{break}$ at 1-10MeV in some large CME-driven shocks. Theoretical model usually attribute this phenomenon to diffusive shock acceleration. However, the underlying physics of acceleration still remains uncertain. Although previous numerical models can hardly predict due either high computational expense or shortcomings current models, present paper focuses on simulating energy spectrum converged two shocks by Monte Carlo method....
Although diffusive shock acceleration (DSA) could be simulated by some well-established models, the assumption of injection rate from thermal particles to superthermal population is still a contentious problem. But in self-consistent Monte Carlo simulations, because prescribed scattering law instead injected function, hence particle intrinsically defined law. We expect examine correlation energy with multiple angular distributions. According Rankine-Hugoniot conditions, and losses simulation...
More and more observations show that large ground-level enhancement (GLE) events are often associated with twin coronal mass ejections (CMEs). In the twin-shock scenario, preceding CME-driven shock provides an enhanced-level turbulence at upcoming shock. this work, we focus on GLE event 2012 May 17, which would be interactions. Using particle simulation method to examine effect of CMEs being surrounded by forthcoming energy spectrum. We use CMEs-driven produce enhanced seed population...