A5005659413- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Solar and Space Plasma Dynamics
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Atmospheric Ozone and Climate
- GNSS positioning and interference
- Parallel Computing and Optimization Techniques
- Meteorological Phenomena and Simulations
- Astro and Planetary Science
- Magnetic confinement fusion research
- Planetary Science and Exploration
- Regional Economic and Spatial Analysis
- Insect-Plant Interactions and Control
- Remote Sensing and Land Use
- Insect Resistance and Genetics
- Atmospheric and Environmental Gas Dynamics
- Tropical and Extratropical Cyclones Research
- Power Systems and Renewable Energy
- Environmental and Agricultural Sciences
- Atmospheric aerosols and clouds
- Software System Performance and Reliability
- Fluid Dynamics and Turbulent Flows
- Geochemistry and Geochronology of Asian Mineral Deposits
- Scientific Computing and Data Management
The University of Texas at Arlington
2014-2024
NSF National Center for Atmospheric Research
2016-2019
High Altitude Observatory
2016-2018
Peking University
2011
North China Electric Power University
2010
Knowledge Unlatched (Germany)
2000-2006
Minjiang University
2005
Thang Long University
2004
Institute of Zoology
2000
Chinese Academy of Sciences
2000
An important question that is being increasingly studied across subdisciplines of Heliophysics “how do mesoscale phenomena contribute to the global response system?” This review paper focuses on this within two specific but interlinked regions in Near-Earth space: magnetotail’s transition region inner magnetosphere and ionosphere. There a concerted effort Geospace Environment Modeling (GEM) community understand degree which transport magnetotail contributes dynamics magnetic flux...
Abstract We investigate the latitudinal and longitudinal variations of thermospheric nitric oxide (NO) cooling rate from 2005 to 2016. compare maximum NO its altitude measurements by Sounding Atmosphere using Broadband Emission Radiometry (SABER) instrument on National Aeronautics Space Administration (NASA)'s TIMED (Thermosphere‐Ionosphere‐Mesosphere Energetics Dynamics) satellite simulations Thermosphere‐Ionosphere‐Electrodynamics General Circulation Model (TIEGCM). In both data model,...
Abstract Thermospheric temperature and density recovery during the 5 April 2010 geomagnetic storm has been investigated in this study. Neutral as revealed by Thermosphere‐Ionosphere‐Electrodynamics General Circulation Model (TIEGCM) simulations was slower than observations from GOCE, CHAMP, GRACE satellites, suggesting that cooling processes may not be fully represented model. The NO radiative rate TIEGCM also compared with TIMED/SABER measurements along satellite orbits period. It found...
Techniques developed in the past few years enable derivation of multi-scale regional ion convection and particle precipitation patterns from Super Dual Auroral Radar Network (SuperDARN) Time History Events Macroscale Interactions during Substorms (THEMIS) All-Sky Imager (ASI) observations, respectively. Our previous simulations driven by these geomagnetic forcing suggest that both meso-scale can intensify ionospheric thermospheric disturbances with prominent structures notable magnitudes. In...
[1] We present the first systematic observational study on pitch angle evolutions of O+ ions associated with ULF Pc5 poloidal standing waves excited during geomagnetic storms. The ion measurements are made board CLUSTER satellites Composition Distribution Function (CODIF) instrument, which covers energies from 1 to 40 keV, a low-energy portion ring current. find that nature flux oscillation strongly depends magnetic latitude observation. Near equator, appears only around 0° and 180° angles...
Abstract During geomagnetically active times, the enhanced ion convection and particle precipitation at high latitudes cause substantial disturbances in ionosphere thermosphere. Large‐scale traveling ionospheric (LSTIDs) were identified from Global Positioning System (GPS) total electron content (TEC) measurements 06:30 to 08:30 UT on 26 March 2014 as a result of southward turning interplanetary magnetic field (IMF) B z during substorm. The comparison LSTIDs global ionosphere‐thermosphere...
Inter-hemispheric asymmetry (IHA) in Earth’s ionosphere–thermosphere (IT) system can be associated with high-latitude forcing that intensifies during storm time, e.g., ion convection, auroral electron precipitation, and energy deposition, but a comprehensive understanding of the pathways generate IHA IT is lacking. Numerical simulations help address this issue, accurate specification needed. In study, we utilize Active Magnetosphere Planetary Electrodynamics Response Experiment-revised...
Inter specific crosses between Helicoverpa annigera (Hübner) from China and H. zea (Boddie) were evaluated for sterility. Reciprocal through 2 inbred generations Back 4 evaluated. Although few matings obtained some crosses, all mated produced offspring. Sterility was not detected in any cross.
Abstract Using the Millstone Hill incoherent scatter radar observations during 2015 St. Patrick's Day storm, subauroral polarization streams (SAPSs) have been specified in nonhydrostatic Global Ionosphere‐Thermosphere Model simulations. The results reveal that effect of SAPS on coupled thermosphere‐ionosphere system includes following: (1) Sudden frictional heating acoustic‐gravity waves thermosphere. vertical oscillation is localized, while meridional disturbance propagates poleward and...
The present work uses the Thermosphere Ionosphere Electrodynamics General Circulation Model (TIEGCM), under geomagnetically disturbed conditions that are closely related to southward interplanetary magnetic field (IMF), investigate how nighttime poleward wind (30°–50° latitude and 19–22 local time) responds subauroral polarization streams (SAPS) commence at different universal times (UTs). SAPS effects on winds show a remarkable UT variation, with weaker magnitudes 00 12 than 06 18 UT....
Abstract In this study, the Global Ionosphere Thermosphere Model is utilized to investigate inter‐hemispheric asymmetry in ionosphere‐thermosphere (I‐T) system at mid‐ and high‐latitudes (|geographic latitude| > 45°) associated with differences (a) solar irradiance, (b) geomagnetic field, (c) magnetospheric forcing under moderate conditions. Specifically, we have quantified relative significance of above three causes asymmetries spatially weighted averaged E‐region electron density,...
Abstract An approach for creating continental‐scale, multi‐scale plasma convection maps in the nightside high‐latitude ionosphere using spherical elementary current systems technique has been developed and evaluated. The capability to reconstruct meso‐scale flow channels improved dramatically, velocity errors were reduced by ∼30% compared harmonic fitting method. Uncertainties of vectors estimated varying model setup was also low. Convection a substorm event revealed multiple polar cap,...
Abstract An equatorward wind has been observed first by the balloon‐borne Fabry‐Perot interferometer called High‐Altitude Interferometer Wind Observation on side of cusp near local noon, which is opposite to typical direction neutral driven day‐night pressure gradient. However, this dayside was not reproduced standard Thermosphere Ionosphere Electrodynamics General Circulation Model under resolution 5° longitude latitude (5°×5°). In study, Global run in different cases and resolutions...
Abstract In this study, the influences of electric fields at low and middle latitudes on ionosphere thermosphere are investigated by using nonhydrostatic Global Ionosphere Thermosphere Model (GITM). The equatorial ionization anomaly (ETA) well reproduced in simulation when included. term analysis continuity equation neutral mass density shows that daytime upward vertical wind near geomagnetic equator tends to increase local 400 km altitude, while divergence meridional associated with...
Abstract Perturbations caused by geophysical and anthropogenic events on the ground have been observed to propagate upward impact upper atmosphere. Gravity waves with wavelengths less than 750 km are known be responsible for total electron content (TEC) perturbations play a significant role in mass, momentum, energy budgets of mesosphere lower thermosphere. These are, however, difficult continuously measure, globally resolve, deterministically specify first‐principle ionosphere‐thermosphere...
Abstract Ionospheric conductivity plays an important role in the magnetosphere‐ionosphere coupling. The altitudinal distribution of Pedersen gives us a rough idea about Joule heating at high latitudes, which is great significance regarding response upper atmosphere to geomagnetic energy inputs. Based on electron density profiles derived from Constellation Observing System for Meteorology, Ionosphere, and Climate measurements during 2009–2014, has been estimated. A climatologic study...
Abstract In this study, the impact of improving soft (0.1–1 keV) electron precipitation on F‐region neutral mass density has been evaluated using Global Ionosphere Thermosphere Model (GITM). Two types energy spectra having same total flux and average but different spectral shapes have used to specify in GITM. One is Maxwellian spectrum other from an empirical model, Auroral Spectrum High‐Latitude Electric field variabilitY (ASHLEY), which provides stronger (up 2–3 orders magnitude)...
Abstract Observations have revealed large Poynting flux and soft electron precipitation around the cusp region, which strong impacts on polar ionosphere/thermosphere. Simulations also confirmed that significantly change neutral density dynamics dayside cap boundary regions. However, no detailed study has been conducted to show if they should coincide with each other or not. Our analysis of Defense Meteorological Satellite Program (DMSP) satellite data reveals a complex correlation between...
Abstract Solar and interplanetary events can create extreme magnetic storms, such as the Carrington storm in 1859 with intensity up to D s t ∼−1,760 nT. The influence of an idealized, smaller Carrington‐type on thermosphere has been simulated using nonhydrostatic Global Ionosphere‐Thermosphere Model. For conditions we simulated, solar wind B Z velocity were −50 nT 1,000 m/s, respectively. corresponding cross polar cap potential reached 360 kV, hemispheric power was 200 GW. Consequently,...
Abstract Using Fabry‐Perot interferometers at five midlatitude stations (Boulder, Palmer, Millstone Hill, Mount John, and Kelan) in both hemispheres, we examine the interhemispheric seasonal variations of thermospheric dynamics. We also use National Center for Atmospheric Research Thermosphere Ionosphere Electrodynamics General Circulation Model (TIEGCM) to simulate changes winds effects from Sub‐Auroral Polarization Streams. The observations TIEGCM simulations show a clear variation with...
Abstract In the high‐latitude thermosphere and ionosphere Joule (frictional) heating rate is related to both conductivity electric field. Thus, an accurate calculation of requires self‐consistent specifications particle precipitation ion convection patterns. However, general circulation models usually use uncorrelated empirical specify separately independently. Here, studies have been conducted examine significance appropriate spatial alignment patterns energy input estimation for upper...
Meso-scale plasma convection and particle precipitation could be significant momentum energy sources for the ionosphere-thermosphere (I-T) system. Following our previous work on I-T response to a typical midnight flow burst, bursts with different characteristics (lifetime, size, speed) have been examined systematically Global Ionosphere-Thermosphere Model (GITM) simulations in this study. Differences between without additional are used illustrate impact of The neutral density perturbation...
Abstract High latitude upper atmospheric inter‐hemispheric asymmetry (IHA) tends to be enhanced during geomagnetic storms, which may due the complex spatiotemporal changes and magnitude modifications in field aligned currents (FACs) particle precipitation (PP). However, relative contribution of FACs PP IHA high‐latitude forcing energy is not well understood. The 2015 St. Patrick’s Day storm has been investigated using global ionosphere thermosphere model (GITM), driven by from Active...