A5087774421- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- GaN-based semiconductor devices and materials
- Sperm and Testicular Function
- Astrophysics and Cosmic Phenomena
- Magnetic confinement fusion research
- Gamma-ray bursts and supernovae
- Solar Radiation and Photovoltaics
- Catalytic C–H Functionalization Methods
- Astrophysical Phenomena and Observations
- Magnetic and Electromagnetic Effects
- Semiconductor Quantum Structures and Devices
- Photocathodes and Microchannel Plates
- Urological Disorders and Treatments
- Synthesis and Catalytic Reactions
- Urinary and Genital Oncology Studies
- Advanced Materials and Semiconductor Technologies
- Magnetic Properties of Alloys
- Reproductive Biology and Fertility
- Plasma Diagnostics and Applications
- Origins and Evolution of Life
- Aldose Reductase and Taurine
Nanjing University
2006-2024
Chongqing Medical University
2024
Laboratory for Atmospheric and Space Physics
2020-2023
University of Colorado Boulder
2020-2023
High Altitude Observatory
2017-2023
NSF National Center for Atmospheric Research
2017-2023
East China Normal University
2022
Institute of Chemistry
2019-2020
Nanjing General Hospital of Nanjing Military Command
2006-2019
Nanjing Drum Tower Hospital
2019
We present a new method for performing differential emission measure (DEM) inversions on narrow-band EUV images from the Atmospheric Imaging Assembly (AIA) onboard Solar Dynamics Observatory (SDO). The yields positive definite DEM solutions by solving linear program. This has been validated against diverse set of thermal models varying complexity and realism. These include (1) idealized gaussian distributions, (2) 3D NOAA Active Region 11158 comprising quasi-steady loop atmospheres in...
We present a realistic numerical model of sunspot and active region formation based on the emergence flux bundles generated in solar convective dynamo. To this end we use magnetic velocity fields horizontal layer near top boundary dynamo simulation to drive radiative-magnetohydrodynamic simulations upper most layers convection zone. The main results are: (1) emerging rise with mean speed upflows, fragment into small-scale elements that further photosphere, where bipolar pairs are formed...
Abstract We present a comprehensive radiative magnetohydrodynamic simulation of the quiet Sun and large solar active regions. The 197 Mm wide domain spans from 18(10) beneath photosphere to 113 in corona. Radiative transfer assuming local thermal equilibrium, optically thin losses, anisotropic conduction transport provide necessary realism for synthesizing observables compare with remote-sensing observations This model self-consistently reproduces observed features Sun, emerging developed...
We study the writhe, twist and magnetic helicity of different flux ropes, based on models solar coronal field structure. These include an analytical force-free Titov--D\'emoulin equilibrium solution, non magnetohydrodynamic simulations, nonlinear models. The geometrical boundary rope is determined by quasi-separatrix layer bottom surface, axis curve its overall orientation. computed Berger--Prior formula that suitable for arbitrary geometry both non-force-free estimated multiplied square...
Magnetic helicity is a conserved quantity of ideal magneto-hydrodynamics characterized by an inverse turbulent cascade. Accordingly, it often invoked as one the basic physical quantities driving generation and structuring magnetic fields in variety astrophysical laboratory plasmas. We provide here first systematic comparison six existing methods for estimation known finite volume. All such are reviewed, benchmarked, compared with each other, specifically tested accuracy sensitivity to...
Transient brightenings in the transition region of Sun have been studied for decades and are usually related to magnetic reconnection. Recently, absorption features due chromospheric lines identified emission raising question thermal stratification during such reconnection events. We analyze data from Interface Region Imaging Spectrograph an emerging active region. Here spectral profiles show clear self-absorption Si iv. While some indications existed that opacity effects might play role...
We present the first model that couples formation of corona a solar active region to emergence sunspot pair. This allows us study when, where, and why loops form, how they evolve. use 3D radiation MHD simulation an through upper convection zone photosphere as lower boundary for coronal model. The latter accounts braiding magnetic fieldlines, which induces currents in heating up plasma. synthesize emission direct comparison observations. Starting with basically field-free atmosphere we follow...
A cobalt(III)-catalyzed, redox-neutral, intermolecular carboamination of propiolates and bicyclic alkenes was developed. This non-annulative coupling strategy features atom economy, high regioselectivity, good yields, functional groups tolerance. Such a reaction applied to modified phenols from the corresponding under mild conditions.
We present a method of conducting data-driven simulations solar active regions and flux emergence with the MURaM radiative magnetohydrodynamics (MHD) code. The horizontal electric field derived from full velocity magnetic vectors, is implemented at photospheric (bottom) boundary to drive induction equation. energy equation accounts for thermal conduction along fields, optically-thin loss, heating coronal plasma by viscous resistive dissipation, which allows realistic presentation...
Radiative magnetohydrodynamic simulation includes sufficiently realistic physics to allow for the synthesis of remote sensing observables that can be quantitatively compared with observations. We analyze largest flare in a emergence large flare-productive active regions described by Chen et al. The releases $4.5\times10^{31}$ erg magnetic energy and is accompanied spectacular coronal mass ejection. Synthetic soft X-ray flux this reaches M2 class. eruption reproduces many key features...
Context. In the upper atmosphere of Sun observations show convincing evidence for crossing and twisted structures, which are interpreted as mutual helicity self-helicity. Aims. We use with new Interface Region Imaging Spectrograph (IRIS) to conversion into self-helicity in coronal structures on Sun. Methods. Using far UV spectra slit-jaw images from IRIS magnetograms SDO, we investigated evolution two loops an active region, particular, properties Si IV line profile cool loops. Results....
A method for the determination of α-1-fetoprotein (AFP) in human serum by using a horseradish peroxidase (HRP) label an enzyme-linked immunosorbent assay (ELISA) is proposed. The based on electrochemical enzymatic reaction product with differential pulse voltammetry at gold disk electrode. consists two successive steps. first step conventional HRP-mediated ELISA formation electroactive 2,2′-diaminoazobenzene means o-phenylenediamine–H2O2–HRP system. At second step, exhibits sensitive...
We present a detailed study of explosive chromospheric evaporation during microflare which occurred on 2007 December 7 as observed with the Extreme-ultraviolet Imaging Spectrometer board Hinode. find temperature-dependent upflows for lines formed from 1.0 to 2.5 MK and downflows 0.05 0.63 in impulsive phase flare. Both line intensity nonthermal width appear enhanced most are temporally correlated velocity. Our results consistent numerical simulations flare models, take into account strong...
Abstract It was recently proposed that the intensity ratios of several extreme ultraviolet spectral lines from Fe x ions can be used to measure solar coronal magnetic field based on magnetic-field-induced transition (MIT) theory. To verify suitability this method, we performed forward modeling with a three-dimensional radiation magnetohydrodynamic model active region. Intensities were synthesized model. Based MIT theory, line 257 Å other derive magnetic-field strengths, which then compared...
Abstract Spectropolarimetric reconstructions of the photospheric vector magnetic field are intrinsically limited by $180^{\circ}$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mn>180</mml:mn> <mml:mo>∘</mml:mo> </mml:msup> </mml:math> ambiguity in orientation transverse component. The successful launch and operation Solar Orbiter have made removal 180 ∘ possible using solely observations obtained from two different vantage points. While exploitation such a...
Abstract We analyze the forces that control dynamic evolution of a flux rope eruption in three-dimensional radiative magnetohydrodynamic simulation. The confined gives rise to C8.5 flare. rises slowly with an almost constant velocity few kilometers per second early stage when gravity and Lorentz force are nearly counterbalanced. After height at which decay index external poloidal field satisfies torus instability criterion, significantly enhanced breaks balance drives rapid acceleration...
In this ISSI-supported series of studies on magnetic helicity in the Sun, we systematically implement different calculation methods high-quality solar magnetogram observations. We apply finite-volume, discrete flux tube (in particular, connectivity-based) and flux-integration to data from Hinode's Solar Optical Telescope. The target is NOAA active region 10930 during a ~1.5 day interval December 2006 that included major eruptive flare (SOL2006-12-13T02:14X3.4). Finite-volume...
Abstract The morphology of primitive cells has been the subject extensive research. A spherical form was commonly presumed in prebiotic studies but lacked experimental evidence living cells. Whether and how shape changed are unclear. Here we exposed rod-shaped bacterium Escherichia coli to a resource utilization regime mimicking primordial environment. Oleate given as an easy-to-use model nutrient, fatty acid vesicles were likely present on Earth might have used energy resource. Six...