A5053268406- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Earthquake Detection and Analysis
- Geomagnetism and Paleomagnetism Studies
- Atmospheric Ozone and Climate
- Electron and X-Ray Spectroscopy Techniques
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Laser-Plasma Interactions and Diagnostics
- Radiation Effects in Electronics
- Dark Matter and Cosmic Phenomena
- Ion-surface interactions and analysis
- Spacecraft Design and Technology
- Magnetic confinement fusion research
- Solar Radiation and Photovoltaics
- Astro and Planetary Science
- Particle Detector Development and Performance
- Plasma Diagnostics and Applications
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Atmospheric aerosols and clouds
- Laser-induced spectroscopy and plasma
- Pulsed Power Technology Applications
- Energy, Environment, and Transportation Policies
- Surface Roughness and Optical Measurements
University of New Hampshire
2013-2024
University of New Hampshire at Manchester
2014-2024
National Space Science Center
2011-2016
Boston University
2004-2010
Chia Nan University of Pharmacy and Science
2005
University of California, Los Angeles
2003
Quantifying radial transport of radiation belt electrons in ULF wave fields is essential for understanding the variability trapped relativistic electrons. To estimate diffusion coefficients ( D LL ), we follow MeV realistic magnetospheric configurations and calculated from a global MHD code. We create idealized pressure‐driven simulations controlled solar wind velocities (hereafter referred to as V x simulations) with waves that are comparable GOES data under similar conditions, by driving...
Abstract Using measurements from the Van Allen Probes and Balloon Array for RBSP Relativistic Electron Losses (BARREL), we perform a case study of electromagnetic ion cyclotron (EMIC) waves associated relativistic electron precipitation (REP) observed on 25–26 January 2013. Among all EMIC wave REP events two missions, pair is closest both in space time. The Probe‐B detected significant at L = 2.1–3.9 magnetic local time (MLT) 21.0–23.4 53.5 min 2353:00 UT, 25 Meanwhile, BARREL‐1T clear...
Abstract Gyroresonant wave‐particle interactions with very low frequency whistler mode chorus waves can accelerate subrelativistic seed electrons (hundreds of keV) to relativistic energies in the outer radiation belt during geomagnetic storms. In this study, we conduct a superposed epoch analysis wave activity, electron development, and response between L* = 2.5 5.5, for 25 coronal mass ejection 35 corotating interaction region storms using Van Allen Probes observations. Electron data from...
Abstract Identifying Galactic PeVatrons (PeV particle accelerators) from ultrahigh-energy (UHE, >100 TeV) γ -ray sources plays a crucial role in revealing the origin of cosmic rays. The UHE source 1LHAASO J1857+0203u is suggested to be associated with HESS J1858+020, which may attributed possible PeVatron candidate supernova remnant (SNR) G35.6−0.4 or H ii region G35.6−0.5. We perform detailed analysis on very-high-energy and emissions toward this data Large High Altitude Air Shower...
Abstract The interaction between Earth’s magnetic field and the solar wind results in formation of a collisionless bow shock 60,000–100,000 km upstream our planet, as long fast magnetosonic Mach (hereafter Mach) number exceeds unity. Here, we present one those extremely rare instances, when reached steady values <1 for several hours on 17 January 2013. Simultaneous measurements by more than ten spacecraft near-Earth environment reveal evanescence shock, sunward motion magnetopause rapid...
We evaluate the performance of recent empirical magnetic field models (Tsyganenko, 1996, 2002a, 2002b; Tsyganenko and Sitnov, 2005, hereafter referred to as T96, T02 TS05, respectively) during storm times including both pre‐ post‐storm intervals. The model outputs are compared with GOES observations at geosynchronous orbit. In case a major storm, T96 predict anomalously strong negative B z geostationary orbit on nightside due input values exceeding limits, whereas comprehensive data survey...
Glossogyne tenuifolia is a native traditional anti-inflammatory herb in Taiwan. It has previously been shown that the ethanol extract of G. (GT) inhibited LPS-induced inflammatory mediator release from murine macrophage cell line and human whole blood. In present work, extracts its major constituent, luteolin-7-glucoside, were to be scavengers 1,1-diphenyl-2-picrylhydrazyl, superoxide, hydroxyl radicals. Moreover, copper-induced low-density lipoprotein oxidation was suppressed by GT...
To provide critical ULF wave field information for radial diffusion studies in the radiation belts, we quantify power ( f = 0.5–8.3 mHz) GOES observations and magnetic predictions from a global magnetospheric model. A statistical study of 9 years data reveals local time distribution at geosynchronous orbit field‐aligned coordinates as functions frequency, solar wind conditions V x , Δ P d IMF B z ) geomagnetic activity levels Kp Dst AE ). grows monotonically with increasing dynamic pressure...
We compare global magnetohydrodynamic (MHD) simulation results with an empirical model and observations to understand the magnetic field configuration plasma distribution in inner magnetosphere, especially during geomagnetic storms. The physics‐based Lyon‐Fedder‐Mobarry (LFM) code simulates Earth's magnetospheric topology dynamics by solving equations of ideal MHD. Quantitative comparisons simulated events reveal strengths possible limitations suggest ways improve LFM code. Here we present a...
A new neural network technique, support vector regression (SVR), is applied to forecast the solar wind (SW) velocity. SVR a non-linear efficient tool for high data processing based on statistical learning theory. Its advantage that input only requires several periods (about four 27-d solar-rotation SW velocity prediction in this study), and quite reliable. In our work, we deliberately choose typical covering all main space weather conditions: during 9 yr from 1998 2006, which includes of...
Characterizing the lunar radiation environment is essential for preparing future robotic and human explorations on bases. Galactic cosmic rays (GCR) represent one source of ionizing at Moon that poses a biological risk. Because GCR are charged particles, their paths affected by magnetic fields along trajectories. Unlike Earth, has no strong, shielding field its own. However, as it orbits traverses not only weak interplanetary but also distant tail Earth's magnetosphere. We combine an...
Abstract Whistler mode chorus waves influence the dynamics of Earth's radiation belts and inner magnetosphere through gyroresonant wave particle interactions. Chorus are generated by anisotropic hot electrons from a few to tens keV, called source electrons, which have increased access nightside plasma sheet during geomagnetic storms. The primary drivers storms coronal mass ejections (CMEs) corotating interaction regions (CIRs). Through differences in their characteristic physical parameters,...
The kinetic stability of a plasma in the magnetic field current rod is investigated for various temperature and density profiles using three-dimensional particle-in-cell simulations. Such obeys similar physics to dipole field, while it easier perform computer simulations, do theoretical analysis, rod. Simple energy principle calculations simulations with variety show that stable interchange pressure proportional r−10/3. As predicted by theory also profile will be stationary as long r−2 even...
The attenuation length of the muon content in extensive air showers provides important information regarding generation and development showers. This can be used not only to improve description such but also test fundamental models hadronic interactions. Using data from LHAASO-KM2A experiment, high-energy was studied. measured experimental energy range 0.3 30 PeV using constant intensity cut method. By comparing with predictions interaction (QGSJET-II-04, SIBYLL 2.3d, EPOS-LHC), it is...
Abstract We present multiple derivations of the Total Radiation Belt Electron Content (TRBEC), an indicator global number electrons that instantaneously occupy radiation belts. Derived from electron flux measurements, TRBEC reduces spatial information into a scalar quantity concisely describes aspects system. This index provides simple, global, and long‐term assessment belts enables systematic analysis. In this work, we examine using adiabatic invariants which has been used in previous...
Abstract Precipitation into the atmosphere is one of main processes by which high energy electrons trapped in Earth's inner magnetosphere are lost from system. Precipitating can affect chemical composition and provide insight complex dynamics Van Allen radiation belts. This study compares energetic electron precipitation measurements at low‐Earth‐orbit Focused Investigations Relativistic Electron Burst Intensity, Range, Dynamics (FIREBIRD‐II) CubeSats with NOAA Polar‐orbiting Operational...