A5047318465- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Solar Radiation and Photovoltaics
- Various Chemistry Research Topics
- Microfluidic and Capillary Electrophoresis Applications
- Spacecraft Dynamics and Control
- Gamma-ray bursts and supernovae
- Space Satellite Systems and Control
- Photovoltaic System Optimization Techniques
- Catalysis and Oxidation Reactions
- Quantum Information and Cryptography
- Machine Learning in Materials Science
University of Science and Technology of China
2014-2023
Chinese Academy of Meteorological Sciences
2020
Chinese Academy of Sciences
2020
China Astronaut Research and Training Center
2016-2018
ABSTRACT Solar active regions (ARs) are the major sources of two most violent solar eruptions, namely flares and coronal mass ejections (CMEs). The largest AR in past 24 years, NOAA 12192, which crossed visible disk from 2014 October 17 to 30, unusually produced more than one hundred flares, including 32 M-class 6 X-class ones, but only small CME. Flares CMEs believed be phenomena same eruptive process. Why is such a flare-rich so CME-poor? We compared this with other four ARs; were...
Abstract The largest geomagnetic storm so far, called 2015 St. Patrick's Day event, in the solar cycle 24 was produced by a fast coronal mass ejection (CME) originating on 15 March 2015. It an initially west‐oriented CME and expected to only cause weak disturbance. Why did this finally such large storm? We try find some clues investigating its propagation from Sun 1 AU. First, we reconstruct CME's kinematic properties corona SOHO Solar Dynamics Observatory imaging data with aid of graduated...
We present multi-wavelength observations of a prominence eruption originating from quadrupolar field configuration, in which the was embedded side arcade. Within two-day period prior to its on 2012 October 22, perturbed three times by chromospheric fibrils underneath, rose upward, became brightened, and merged into prominence, resulting horizontal flows along axis, suggesting that fluxes carried were incorporated magnetic prominence. These perturbations caused oscillate rise faster than...
Abstract Filament eruptions are magnetically driven violent explosions commonly observed on the Sun and late-type stars, sometimes leading to monster coronal mass ejections that directly affect nearby planets’ environments. More than a century of research solar filaments suggests slow evolution photospheric magnetic fields plays decisive role in initiating filament eruptions, but underlying mechanism remains unclear. Using high-resolution observations from Chinese H α Solar Explorer, Upper...
Abstract Deflection of coronal mass ejections (CMEs) in the interplanetary space, especially ecliptic plane, serves as an important factor deciding whether CMEs arrive at Earth. Observational studies have shown evidence for deflection, whose detailed dynamic processes, however, remain obscure. Here we developed a 2.5D ideal magnetohydrodynamic simulation to study propagation traveling with different speeds heliospheric equatorial plane. The confirms existence CME deflection which is related...
A jet is a considerable amount of plasma being ejected from the chromosphere or lower corona into higher and common phenomenon. Usually, triggered by brightening flare, which provides first driving force to push upward. In this process, magnetic reconnection thought be mechanism convert energy thermal, nonthermal, kinetic energies. However, most jets could reach an unusual high altitude end much later than its associated flare. This fact implies that there another way continuously transfer...
The 2011 January 28 M1.4 flare exhibits two side-by-side candle-flame-shaped loop systems underneath a larger cusp-shaped structure during the decay phase, as observed at northwestern solar limb by Solar Dynamics Observatory (SDO). northern system brightens following initiation of within southern system, but all three structures are characterized ~ 10 MK temperatures, hotter than arch-shaped loops underneath. "Ahead" satellite Terrestrial Relations (STEREO) provides top view, in which...
Large-scale solar eruptions are believed to have a magnetic flux rope as the core structure. However, it remains elusive how builds up and what triggers its eruption. Recent observations found that prominence erupted following multiple episodes of "flux feeding". During each episode, chromospheric fibril rose merged with lying above. In this letter, we carried out 2.5-dimensional magnetohydrodynamic (MHD) numerical simulations investigate whether flux-feeding mechanism can explain such an...
In this paper, we identified the magnetic source locations of 142 quasi- homologous (QH) coronal mass ejections (CMEs), which 121 are from solar cycle (SC) 23 and 21 SC 24. Among those CMEs, 63% originated same location as their predecessor (defined S-type), while 37% origi- nated a different within active region D-type). Their distinctly waiting time distribution, peaking around 7.5 1.5 hours for S- D-type suggests that they might involve physical mechanisms with characteristic scales....
Abstract The Heliospheric Imagers (HI) onboard the two spacecraft of Solar Terrestrial Relations Observatory (STEREO) provided white‐light images transients in solar wind from dual perspectives 2007 to 2014. In this paper, we develop a new method identify and locate automatically simultaneous inner telescopes, known as HI‐1, based on correlation analysis. Correlation coefficient (cc) maps along Sun‐Earth line are constructed for period 1 January 2010 28 February 2011. From maps, propagating...
Introduction: Large-scale solar eruptive activities have a close relationship with coronal magnetic flux ropes. Previous numerical studies found that the equilibrium of rope system could be disrupted if axial exceeds critical value, so catastrophe occurs, initiating to erupt. Further discovered does not necessarily exist: The certain photospheric distributions non-catastrophic. It is noteworthy most previous are under ideal magnetohydrodynamic (MHD) condition, it still elusive whether there...
Solar eruptions occurring at different places within a relatively short time interval are considered to be sympathetic. However, it is difficult determine whether there exists cause and effect between them. Here we study failed successful filament eruption following an X1.8-class flare on 2014 December 20, in which slipping-like magnetic reconnections serve as key causal link among the eruptions. Reconnection signatures effects are: both sides of experiencing eruption, serpentine ribbons...
We present the first observation, analysis and modeling of solar coronal twin jets, which occurred after a preceding jet. Detailed on kinetics jet reveals its blowout-jet nature, resembles one studied in Liu et al. 2014. However erupting process jets appear to be different from one. In lack detailed information magnetic fields region, we instead use numerical simulation using three-dimensional (3D) MHD model as described Fang 2014, find that pair form due reconnection between ambient open...
Abstract Based on the Heliospheric Imager-1 images of STEREO twin spacecraft, we established CORrelation-Aided Reconstruction (CORAR) technique to locate and reconstruct 3D structures solar wind transients in interplanetary space. Here, extend CORAR method COR2 board study evolution small-scale outer corona from 2010 January May. We confirm that can be located reconstructed well by comparing results with those a self-similar expanding model. The speed distribution generally shows typical...
Since only the magnetic conditions at photosphere can be routinely observed in current observations, it is of great significance to find out influences photospheric on solar eruptive activities. Previous studies about catastrophe indicated that system consisting a flux rope partially open bipolar field subject catastrophe, but not if completely closed under same specified conditions. In order investigate influence catastrophic behavior this system, we expand upon 2.5 dimensional ideal...
2.5D time-dependent ideal magnetohydrodynamic (MHD) models in Cartesian coordinates were used previous studies to seek MHD equilibria involving a magnetic flux rope embedded bipolar, partially open background field. As demonstrated by these studies, the equilibrium solutions of system are separated into two branches: sticks photosphere for at lower branch but is suspended corona those upper branch. Moreover, solution originally jumps upper, as related control parameter increases and reaches...
It is widely accepted that coronal magnetic flux ropes are the core structures of large-scale solar eruptive activities, which inflict dramatic impacts on solar-terrestrial system. Previous studies have demonstrated varying properties a rope system could result in catastrophe rope, may trigger activities. Since total mass also plays an important role stabilizing we use 2.5-dimensional magnetohydrodynamic (MHD) numerical simulations this letter to investigate how evolves as its varies. found...
An interesting phenomenon, plasma poloidal motion, has been found in many magnetic clouds (MCs), and viscosity proposed as a possible mechanism. However, it is not clear how significant the role of generating such motion. In this paper, we conduct statistical study MCs detected by Wind spacecraft during 1995–2012. It that, for 19% all studied (186), velocities MC near boundaries are well correlated with those corresponding ambient solar wind plasma. A non-monotonic increase from inner to...
In this article, we present the multi-viewpoint and multi-wavelength analysis of an atypical solar jet based on data from Solar Dynamics Observatory, SOlar, Heliospheric TErrestrial RElations Observatory. It is usually believed that coronal mass ejections (CMEs) are developed large scale eruptions in lower atmosphere. However, kinematical spatial evolution 2013 April 28 guide us was clearly associated with a narrow CME having width approx 25 degrees speed 450 km/s. To better understand link...
Abstract Recently, we developed the correlation-aided reconstruction (CORAR) method to reconstruct solar wind inhomogeneous structures, or transients, using dual-view white-light images. This is proved be useful for studying morphological and dynamical properties of transients like blobs coronal mass ejection (CME), but accuracy may affected by separation angle between two spacecrafts. Based on CME events from Heliospheric Imager Join Catalogue in Cataloguing, Analysis Techniques Service...
Context. In previous studies, we applied the CORrelation-Aided Reconstruction (CORAR) technique to reconstruct three-dimensional (3D) structures of transients in field view (FOV) Heliospheric Imager-1 (HI-1) on board spacecraft STEREO-A/B. The reconstruction quality depends stereoscopic angle ( θ Sun ), that is, between lines connecting and two spacecraft. Aims. To apply CORAR images from coronagraphs COR-2 STEREO, impact coronal should be explored, optimal for found. Methods. We method...
Abstract Magnetic energy during the catastrophe was predominantly studied by previous works since it is believed to be main supplier for solar eruptions. However, contribution of other types energies cannot neglected. This paper studies coronal flux rope system in wind background, with emphasis on transformation different catastrophe. The characterized its axial and poloidal magnetic fluxes total mass. It shown that a can triggered not only an increase but also decrease flux. Moreover,...
We investigate the evolutions of two prominences (P1, P2) and bundles coronal loops (L1, L2), observed with SDO/AIA near east solar limb on 2012 September 22. It is found that there were large-amplitude oscillations in P1 L1 but no detectable motions P2 L2. These transverse triggered by a large-scale wave, originating from large flare remote active region behind limb. By carefully comparing locations heights these oscillating non-oscillating structures, we conclude propagating height wave...