A5002757842- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Solar Radiation and Photovoltaics
- Geophysics and Gravity Measurements
- Rocket and propulsion systems research
- Energetic Materials and Combustion
- Gamma-ray bursts and supernovae
- Atmospheric Ozone and Climate
- Gene Regulatory Network Analysis
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Fault Detection and Control Systems
- Pulsars and Gravitational Waves Research
- Advanced Control Systems Optimization
- Stability and Control of Uncertain Systems
- Astrophysics and Star Formation Studies
- History and Developments in Astronomy
- Process Optimization and Integration
- Spacecraft and Cryogenic Technologies
- Microbial Metabolic Engineering and Bioproduction
- Earthquake Detection and Analysis
- Adaptive Control of Nonlinear Systems
Mongolian National University
2025
Peking University
2011-2024
National Space Science Center
2022-2024
Chinese Academy of Sciences
2016-2024
Chongqing University of Posts and Telecommunications
2019-2024
Anhui University
2024
Griffith University
2024
Beihang University
2006-2024
Henan Agricultural University
2024
Zhejiang University
2024
The Interface Region Imaging Spectrograph (IRIS) small explorer spacecraft provides simultaneous spectra and images of the photosphere, chromosphere, transition region, corona with 0.33-0.4 arcsec spatial resolution, 2 s temporal resolution 1 km/s velocity over a field-of-view up to 175 x arcsec. IRIS was launched into Sun-synchronous orbit on 27 June 2013 using Pegasus-XL rocket consists 19-cm UV telescope that feeds slit-based dual-bandpass imaging spectrograph. obtains in passbands from...
As the interface between Sun’s photosphere and corona, chromosphere transition region play a key role in formation acceleration of solar wind. Observations from Interface Region Imaging Spectrograph reveal prevalence intermittent small-scale jets with speeds 80 to 250 kilometers per second narrow bright network lanes this region. These have lifetimes 20 seconds widths ≤300 kilometers. They originate regions, often preceded by footpoint brightenings accompanied transverse waves amplitudes ~20...
The solar atmosphere was traditionally represented with a simple one-dimensional model. Over the past few decades, this paradigm shifted for chromosphere and corona that constitute outer atmosphere, which is now considered dynamic structured envelope. Recent observations by IRIS (Interface Region Imaging Spectrograph) reveal it difficult to determine what up down even in cool 6000-K photosphere just above surface: region hosts pockets of hot plasma transiently heated almost 100,000 K. energy...
Abstract The Solar Upper Transition Region Imager (SUTRI) onboard the Space Advanced Technology demonstration satellite (SATech-01), which was launched to a Sun-synchronous orbit at height of ∼500 km in 2022 July, aims test on-orbit performance our newly developed Sc/Si multi-layer reflecting mirror and 2k×2k EUV CMOS imaging camera take full-disk solar images Ne vii 46.5 nm spectral line with filter width ∼3 nm. SUTRI employs Ritchey–Chrétien optical system an aperture 18 cm. observations...
The fluctuating magnetic helicity is considered an important parameter in diagnosing the characteristic modes of solar wind turbulence. Among them Alfvén-cyclotron wave, which probably responsible for plasma heating, but has not yet been identified from Here, we present possible signatures waves distribution as a function θVB, angle between velocity and local mean field. We use field data STEREO spacecraft to calculate θVB normalized reduced σm. find dominant negative σm 1 s < p 4 (p time...
The physical processes causing energy exchange between the Sun's hot corona and its cool lower atmosphere remain poorly understood. chromosphere transition region (TR) form an interface surface that is highly sensitive to coronal heating mechanism. High-resolution observations with Interface Region Imaging Spectrograph (IRIS) reveal rapid variability (~20 60 seconds) of intensity velocity on small spatial scales (≲500 kilometers) at footpoints dynamic loops. are consistent numerical...
Semiempirical atmospheric models of solar surface features as observed at moderate resolution are useful tools for understanding the spectral irradiance variations. Paper I described a set constructed to reproduce radiance spectrum ∼2 arcsec that constitute an average over small-scale such granulation. II showed revision previous low-chromospheric inter-network regions explains infrared CO lines in addition UV and radio continuum from submillimeter centimetric wavelengths. The present paper...
This paper investigates the problem of robust H(∞) state estimation for a class continuous-time nonlinear systems via Takagi-Sugeno (T-S) fuzzy affine dynamic models. Attention is focused on analysis and design an admissible full-order filter such that resulting filtering error system asymptotically stable with guaranteed disturbance attenuation level. It assumed plant premise variables, which are often variables or their functions, not measurable so implementation state-space partition may...
The solar chromosphere and transition region (TR) form an interface between the Sun's surface its hot outer atmosphere. There, most of nonthermal energy that powers atmosphere is transformed into heat, although detailed mechanism remains elusive. High-resolution (0.33-arc second) observations with NASA's Interface Region Imaging Spectrograph (IRIS) reveal a TR are replete twist or torsional motions on sub-arc second scales, occurring in active regions, quiet Sun coronal holes alike. We...
Magnetic reconnection is believed to be the dominant energy release mechanism in solar flares. The standard flare model predicts both downward and upward outflow plasmas with speeds close coronal Alfvén speed. Yet, spectroscopic observations of such outflows, especially downflows, are extremely rare. With newly launched Interface Region Imaging Spectrograph (IRIS), we report detection a greatly redshifted (∼125 km s−1 along line sight) Fe xxi 1354.08 Å emission ∼100 nonthermal width at site...
Spicules are rapidly evolving fine-scale jets of magnetized plasma in the solar chromosphere. It remains unclear how these prevalent originate from surface and what role they play heating atmosphere. Using Goode Solar Telescope at Big Bear Observatory, we observed spicules emerging within minutes appearance opposite-polarity magnetic flux around dominant-polarity field concentrations. Data Dynamics Observatory showed subsequent adjacent corona. The dynamic interaction fields (likely due to...
ABSTRACT Recent observations by the Interface Region Imaging Spectrograph (IRIS) have revealed pockets of hot gas (∼2–8 × 10 4 K) potentially resulting from magnetic reconnection in partially ionized lower solar atmosphere (IRIS bombs; IBs). Using joint between IRIS and Chinese New Vacuum Solar Telescope, we identified IBs. We find that 3 are unambiguously others possibly connected to Ellerman bombs (EBs), which show intense brightening extended <?CDATA ${{\rm{H}}}_{\alpha }$?> wings without...
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...
With observations from the Interface Region Imaging Spectrograph (IRIS), we track complete evolution of $\sim$11 MK evaporation flows in an M1.1 flare on 2014 September 6 and X1.6 10. These hot flows, as indicated by blueshifted Fe~{\sc{xxi}}~1354.08\AA{}~line, evolve smoothly with a velocity decreasing exponentially $\sim$200~km~s$^{-1}$ to almost stationary within few minutes. We find good correlation between flow energy deposition rate represented hard X-Ray flux observed Reuven Ramaty...
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 report on observations of recurrent jets by instruments onboard the Interface Region Imaging Spectrograph (IRIS), Solar Dynamics Observatory (SDO) and Hinode spacecrafts. Over a 4-hour period July 21st 2013, coronal were observed to emanate from NOAA Active 11793. FUV spectra probing plasma at transition region temperatures show evidence oppositely directed flows with components reaching Doppler velocities +/- 100 km/s. Raster maps using Si IV line all four have helical motion same sense....
The heating of the outer solar atmospheric layers, i.e., transition region and corona, to high temperatures is a long standing problem in (and stellar) physics. Solutions have been hampered by an incomplete understanding magnetically controlled structure these regions. spatial temporal resolution observations with Interface Region Imaging Spectrograph (IRIS) at limb reveal plethora short, low lying loops or loop segments transition-region that vary rapidly, on timescales minutes. We argue...
The Interface Region Imaging Spectrometer (IRIS) is the first solar instrument to observe $\sim 10$ MK plasma at subarcsecond spatial resolution through imaging spectroscopy of Fe XXI $\lambda$1354.1 forbidden line. IRIS observations X1 class flare that occurred on 2014 March 29 17:48 UT reveal emission from both ribbons and post-flare loop arcade. appears all chromospheric ribbon sites, although typically with a delay one raster (75 seconds) sometimes offset by up 1$^{\prime\prime}$....
Solid evidence of magnetic reconnection is rarely reported within sunspots, the darkest regions with strongest fields and lowest temperatures in solar atmosphere. Using world's largest telescope, 1.6-meter Goode Solar Telescope, we detect prevalent through frequently occurring fine-scale jets H${\alpha}$ line wings at light bridges, bright lanes that may divide dark sunspot core into multiple parts. Many have an inverted Y-shape, shown by models to be typical a unipolar field environment....
Context. Recent observations by the Extreme Ultraviolet Imager (EUI) on board Solar Orbiter have characterized prevalent small-scale transient brightenings in corona above quiet Sun termed campfires. Aims. In this study we search for comparable a numerical model and then investigate their relation to magnetic field processes that drive these events. Methods. We use MURaM code solve 3D radiation MHD equations box stretches from upper convection zone corona. The self-consistently produces...
Abstract The main hallmark of myocardial substrate metabolism in cardiac hypertrophy or heart failure is a shift from fatty acid oxidation to greater reliance on glycolysis. However, the close correlation between glycolysis and underlying mechanism by which causes pathological remodelling remain unclear. We confirm that KLF7 simultaneously targets rate-limiting enzyme glycolysis, phosphofructokinase-1, liver, long-chain acyl-CoA dehydrogenase, key for oxidation. Cardiac-specific knockout...
Filament eruptions are considered to be a common phenomenon on the Sun and other stars, yet they rarely directly imaged in meter decimeter wavebands. Using imaging data from DAocheng solar Radio Telescope (DART) 150--450 MHz frequency range, we present two eruptive filaments that manifest as radio dimmings (i.e., emission depressions). Simultaneously, portions of these discernible dark features chromospheric images. The sun-as-a-star flux curves brightness temperature, derived DART images,...