A5057962981- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Planetary Science and Exploration
- Astrophysics and Cosmic Phenomena
- Geomagnetism and Paleomagnetism Studies
- Earthquake Detection and Analysis
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Digital Marketing and Social Media
- Lightning and Electromagnetic Phenomena
- GNSS positioning and interference
- Graphene and Nanomaterials Applications
- Dye analysis and toxicity
- Consumer Market Behavior and Pricing
- Nonlinear Partial Differential Equations
- Electromagnetic Launch and Propulsion Technology
- Numerical methods in inverse problems
- Aerospace Engineering and Energy Systems
- Corrosion Behavior and Inhibition
- Fluid Dynamics Simulations and Interactions
- Consumer Behavior in Brand Consumption and Identification
- Stellar, planetary, and galactic studies
- Advanced Mathematical Modeling in Engineering
- Astronomy and Astrophysical Research
Chinese Academy of Sciences
2019-2024
Institute of Geology and Geophysics
2019-2024
Institute of High Energy Physics
2020-2023
University of Chinese Academy of Sciences
2019-2023
Chinese Academy of Meteorological Sciences
2023
China State Shipbuilding (China)
2021
Beihang University
2020
We present the X-ray timing results of new black hole candidate (BHC) MAXI J1535-571 during its 2017 outburst from Hard Modulation Telescope (\emph{Insight}-HXMT) observations taken September 6 to 23. Following definitions given by \citet{Belloni2010}, we find that source exhibits state transitions Low/Hard (LHS) Intermediate (HIMS) and eventually Soft (SIMS). Quasi-periodic oscillations (QPOs) are found in intermediate states, which suggest different types QPOs. With large effective area...
Abstract Complex magnetic structures are ubiquitous in turbulent astrophysical plasmas. Such can be host to many dynamic processes, such as reconnection and energy dissipation. Thus, revealing the 3D topologies of these is necessary. In this study, we propose a new method reconstruct complex quasi-steady space plasmas, by utilizing eight-point measurements fields particles. method, based on Second-Order Taylor Expansion (SOTE) field, nonlinear; it constrained <?CDATA ${\rm{\nabla }}\cdot...
Abstract Electron pitch‐angle distributions, including isotropy, pancake, cigar, butterfly, and recently discovered rolling‐pin are crucial to understanding electron dynamics in the magnetotail. However, occurrence rates of these distributions remain unclear. Here, for first time, we reveal magnetotail by using Cluster data during 2001–2009, with special focus on newly reported distribution. We find that percentages 44.7% (isotropy), 31.3% (pancake), 17.5% (cigar), 4.9% (rolling‐pin), 1.6%...
Abstract Magnetic reconnection between neighboring magnetic field loops, the so-called interloop reconnection, is a common process to drive flares in solar atmosphere. However, there no direct evidence that similar but less explosive can take place on planets. The strong crustal fields Mars generate plenty of loops near-Mars regions, providing unique environment research planet. Here, we report events Martian ionosphere observed by Atmosphere and Volatile EvolutioN (MAVEN) for first time....
Abstract Using high‐resolution MMS data, we report the observations of broadband electrostatic waves associated with parallel electron temperature anisotropy ( ) behind a dipolarization front (DF). These include solitary and cyclotron waves. To quantify anisotropy, define flux parameter , where is phase space densities at each energy. By performing correlation analyses between anisotropies power spectral (PSDs) these waves, find that: (a) in 0.8–20 keV are positively correlated electric...
Abstract The current sheet is crucial in releasing magnetic free energy cosmic plasmas via fast reconnection or wave excitation. This research investigates the characteristics of Martian tail by analyzing data acquired from Mars Atmosphere and Volatile EvolutioN spacecraft over 7 years. For first time, we find that approximately 15% events display signatures, including Hall fields proton flows. These reconnecting sheets are detected more frequently on than Earth. demonstrated to be scale,...
Abstract Magnetic reconnection in astronomical objects such as solar corona and the Earth’s magnetotail theoretically produces a fast jet toward object (known confined it connects to through magnetic field lines) departing an unconfined propagates freely space). So far, energetic electron acceleration has been observed but never jet, arousing controversy about whether or not jets can intrinsically accelerate electrons. By analyzing spacecraft measurements magnetotail, here we report three...
Abstract Gravitational‐wave high‐energy Electromagnetic Counterpart All‐sky Monitor (GECAM) is a space‐borne instrument dedicated to monitoring transients, including Terrestrial Gamma‐ray Flashes (TGFs) and Electron Beams (TEBs). We implemented TGF/TEB search algorithm for GECAM, with which 147 bright TGFs, 2 typical TEBs special TEB‐like events are identified during an effective observation time of ∼9 months. show that, gamma‐ray charged particle detectors, GECAM can effectively identify...
Abstract Dipolarization front (DF)—a sharp boundary separating hot tenuous plasmas from cold dense plasmas—is followed by a strong B z region, which is termed flux pileup region (FPR) or dipolarizing bundle (DFB). Using 9‐year (2001–2009) Cluster data, we show that the FPR hosts whistler waves because of pancake distribution electrons, whereas DF lower hybrid drift due to density and magnetic gradients statistically. Different statistical results, report an unexpected case: are generated at...
Abstract Kelvin–Helmholtz (K-H) instability is a fundamental boundary between two fluids with different speeds, exchanging the mass, momentum, and energy across boundary. Although K-H has been suggested to play critical role in atmospheric ion loss on Mars, knowledge about its formation evolution still poor, due limitation of spacecraft missions dearth dedicated simulation codes. In this study, we combine observations from Mars Atmosphere Volatile EvolutioN mission global 3D kinetic...
Abstract Mars is a dry planet with history of warm and wet environment. Hydrogen oxygen continuously escape from the unmagnetized planet. Although heavy ion rate in wake region low due to Mars' obstruction, there are reports events bursty enhanced escape. Here, we first find evidence Alfvenic dayside‐produced plasma clouds accelerated by magnetic reconnection, which provides an explanation for mass observations Atmosphere Volatile EvolutioN (MAVEN) spacecraft. In event reported this study,...
Abstract Using high‐resolution Solar Wind Electron Analyzer data from the Mars Atmosphere and Volatile EvolutioN spacecraft, we report two new types of electron pitch angle distributions (PADs) in Martian plasma environment. The first type PADs, showing primally around , is termed funnel distribution, which was observed near terminator at about 1,200 km altitude. second skirt detected on nightside 1,250 electrons do not exhibit any photoelectron signatures are shown to originate solar wind....
Magnetic reconnection between neighboring magnetic field loops, so-called inter-loop reconnection, is a common process to drive flares in the solar atmosphere. However, there no direct evidence that similar but less explosive can take place on planets. The strong crustal fields Mars are capable of generating plenty loops near regions, which provides unique environment research planet. Here, we report events Martian ionosphere observed by MAVEN for first time. During current layer crossing,...
Abstract In order to study the separation process of underwater active propulsion hood, this paper analyzes main stages system. By using unstructured dynamic mesh technology, control equations computational fluid dynamics are coupled with six-degree-of-freedom motion calculate influence different installation angles device and distance thrust deviation from center gravity on hood. The results show that hydrodynamics will exert a moment causing hood rotate. Excessive rotation can lead...
In this article we establish a Liouville theorem for positive solutions to the differential inequality <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="normal upper Delta Subscript p Baseline u plus Superscript r StartAbsoluteValue nabla EndAbsoluteValue q less-than-or-equal-to 0"> <mml:semantics> <mml:mrow> <mml:msub> <mml:mi mathvariant="normal">Δ</mml:mi> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mi>p</mml:mi> </mml:mrow>...
Atmospheric studies are essential for elucidating the formation history, evolutionary processes, and atmospheric dynamics of exoplanets. High-resolution transmission spectroscopy offers advantage detecting subtle variations in stellar spectral profiles, thereby enabling identification sources observed signals. In this study, we present spectra exoplanet WASP-77Ab, a hot Jupiter with 1.36-day orbital period around G8 host star $V=11.29$ mag. These observations were conducted using...
Abstract Linearization of the vector field, as a common multispacecraft data analysis technique, has been widely used in (1) reconstruction three-dimensional magnetic and velocity fields, (2) predictions possible topologies linear especially for null-point classification, (3) other techniques, such curlometer technique. However, length scale validity approximation space plasmas is still an open question. In this study, we utilize frozen-in condition criterion to estimate accuracy method. We...
A new black hole X-ray binary (BHXRB) MAXI J1535-571 was discovered by during its outburst in 2017. Using observations taken the first Chinese satellite, Hard Modulation Telescope (dubbed as Insight-HXMT), we perform a joint spectral analysis (2-150 keV) both energy and time domains. The spectra provide essential input for probing intrinsic Quasi-Periodic Oscillation (QPO) fractional rms (FRS). Our results show that intermediate state, are general consistent with those reported Swift/XRT...
&lt;p&gt;Magnetic reconnection in astronomical objects such as solar corona and the Earth&amp;#8217;s magnetotail theoretically produces a fast jet toward object (known confined it connects to through magnetic field lines) departing an unconfined propagates freely space). So far, energetic electron acceleration has been observed but never jet, arousing controversy about whether or not jets can intrinsically accelerate electrons. Our study is focused on based Cluster observations...