A5004411560- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Earthquake Detection and Analysis
- Atmospheric Ozone and Climate
- GNSS positioning and interference
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Atmospheric and Environmental Gas Dynamics
- Climate Change Policy and Economics
- Magnetic confinement fusion research
- Planetary Science and Exploration
- Seismic Waves and Analysis
- Plasma Diagnostics and Applications
- Methane Hydrates and Related Phenomena
- Advanced Antenna and Metasurface Technologies
- Calibration and Measurement Techniques
- Energy, Environment, and Transportation Policies
- Lightning and Electromagnetic Phenomena
- Sirtuins and Resveratrol in Medicine
- Adipose Tissue and Metabolism
- Atomic and Subatomic Physics Research
- Electromagnetic Compatibility and Noise Suppression
- Meteorological Phenomena and Simulations
- Ocean Waves and Remote Sensing
Johns Hopkins University Applied Physics Laboratory
2016-2025
South China Agricultural University
2012-2025
Xidian University
2013-2024
Inner Mongolia University
2023-2024
Johns Hopkins University
2004-2023
Shenzhen University
2023
Shandong University
2023
Allentown Public Library
2006-2023
Nanjing University of Science and Technology
2023
Beijing Jiaotong University
2023
The International Reference Ionosphere (IRI) project was established jointly by the Committee on Space Research (COSPAR) and Union of Radio Science (URSI) in late sixties with goal to develop an international standard for specification plasma parameters Earth's ionosphere. COSPAR needed such a evaluation environmental effects spacecraft experiments space, URSI radiowave propagation studies applications. At request URSI, IRI developed as data-based model avoid uncertainty theory-based models...
[1] The Global Ultraviolet Imager (GUVI) instrument carried aboard the NASA TIMED satellite measures spectral radiance of Earth's far ultraviolet airglow in region from 120 to 180 nm using a cross-track scanning spectrometer design. Continuous operation provides images disk and limb five selectable bands. Also, spectra at fixed mirror position can be obtained. Initial results demonstrate quantitative functionality for studies dayglow, aurora, ionosphere. Moreover, through forward modeling,...
Abstract Ionospheric F 2 region peak densities (NmF2) are expected to have a positive correlation with total electron content (TEC), and usually show an anticorrelation temperatures near the ionospheric peak. However, during 17 March 2015 great storm, observed TEC, NmF2, of storm‐enhanced density (SED) over Millstone Hill (42.6°N, 71.5°W, 72° dip angle) quiet different picture. Compared time ionosphere, height (hmF2), above ~220 km increased, but NmF2 decreased significantly within SED. This...
Abstract OVATION Prime (OP) is an auroral precipitation model parameterized by solar wind driving. Distinguishing features of the include optimized wind‐magnetosphere coupling function ( d Φ MP / dt ) which predicts power significantly better than Kp or other traditional parameters, separation aurora into categories (diffuse aurora, monoenergetic, broadband, and ion), inclusion seasonal variations, separate parameter fits for each magnetic latitude (MLAT) × local time (MLT) bin, thus...
Article18 July 2019Open Access Transparent process Succinate induces skeletal muscle fiber remodeling via SUCNR1 signaling Tao Wang Guangdong Province Key Laboratory of Animal Nutritional Regulation, College Science, South China Agricultural University, Guangzhou, Guangdong, Search for more papers by this author Ya-Qiong Xu Ye-Xian Yuan Ping-Wen Division Endocrinology, Department Medicine, The University Illinois at Chicago, IL, USA Cha Zhang Fan Li Li-Na Cong Yin Lin Xing-Cai Cai Can-Jun...
Abstract There are still uncertainties regarding the formation mechanisms for storm‐enhanced density (SED) in high and subauroral latitude ionosphere. In this work, we deploy Thermosphere Ionosphere Electrodynamic General Circulation Model (TIEGCM) GPS total electron content (TEC) observations to identify principle SED tongue of ionization (TOI) through term‐by‐term analysis ion continuity equation also advantages deficiencies TIEGCM capturing high‐latitude ionospheric fine structures two...
[1] Thermospheric O/N2 column density ratios referenced at a N2 of 1017 cm−2 are obtained using the IMAGE SI-13 and TIMED/GUVI far-ultraviolet (FUV) dayglow data, AURIC simulation results, MSIS86 model. Each magnetic storms occurring during 4-day period (1–4 October 2002) caused significant depletion that was detected by both GUVI instruments. The extended down to latitudes 10° −5° in Northern Southern Hemispheres, respectively. Simultaneous measurements show an excellent agreement between...
Operational sensors are designed and intended to reliably produce the measurements needed develop high-value key environmental parameters. The Special Sensor Ultraviolet Spectrographic Imager (SSUSI) is slated fly on next five Defense Meteorological Satellite Program launches (beginning with launch of F16 in Fall 2001). SSUSI will routinely maps ionospheric upper atmospheric composition image aurora. In this paper we describe these products our validation plans process through which can...
Ionospheric responses to the initial phases of three geomagnetic storms: 2–5 April 2004, 7–9 November and 13–16 December 2006, were compared using both ground‐based GPS total electron content (TEC) data coupled magnetosphere ionosphere thermosphere (CMIT) model simulations. The onset times for these storms all occurred at local daytime in North American sector. This similarity other factors resulted some common features their ionospheric response. These include (1) enhanced TEC (positive...
Abstract The far ultraviolet (FUV) spectral range (from about 115 nm to 180 nm) is one of the most useful regions for characterizing upper atmosphere (thermosphere and ionosphere). principal advantages are that there FUV signatures major constituents as well high‐latitude energy inputs. Because absorption by thermospheric O 2 , seen against a “black” background, i.e., not affected ground albedo or clouds and, consequence, can make observations aurora during day when Moon above horizon. In...
Abstract Simultaneous observations of Birkeland currents by the constellation Iridium satellites and N 2 Lyman‐Birge‐Hopfield (LBH) auroral emissions measured Global Ultraviolet Imager (GUVI) onboard Thermosphere, Ionosphere, Mesosphere Energetics Dynamics (TIMED) satellite are used to establish relationships between large‐scale upward field‐aligned electron precipitation during stable current configurations. The was inferred from GUVI data using a statistical relationship LBH intensity...
Abstract We use incoherent scatter radar observations at Millstone Hill (MHO) and Arecibo (AO) topside ionosphere in situ Defense Meteorological Satellite Program (DMSP) during the great geomagnetic storm on 17–18 March 2015 to conduct a focused study ion‐neutral coupling time thermosphere dynamics. Some of these were made around large ionospheric drifts within subauroral polarization stream (SAPS). During main phase, we identify multiple disturbance characteristics North American late...
Abstract The geomagnetic storm of 17–18 March 2015 was caused by the impacts a coronal mass ejection and high‐speed plasma stream from hole. high‐latitude ionosphere dynamics is studied using arrays ground‐based instruments including GPS receivers, HF radars, ionosondes, riometers, magnetometers. phase scintillation index computed for signals sampled at rate up to 100 Hz specialized receivers supplemented proxy obtained geodetic‐quality data 1 Hz. In context solar wind coupling...
Abstract Detailed understanding of the interaction between a chiral molecule and noble metal surface is essential to rationalize advance interfacial self‐assembly amino acids metal‐mediated anchoring proteins. Here we demonstrate that individual Au@Ag core–shell nanocuboids can serve as plasmonic reporter an extended helical network formed among chemisorbed cysteine molecules, through generating interband absorption enhanced, Ag‐surface‐exclusive circular dichroism (CD) band in UV region....
Abstract In Earth’s low atmosphere, hurricanes are destructive due to their great size, strong spiral winds with shears, and intense rain/precipitation. However, disturbances resembling have not been detected in upper atmosphere. Here, we report a long-lasting space hurricane the polar ionosphere magnetosphere during solar otherwise geomagnetic activity. This shows circular horizontal plasma flow nearly zero-flow center, coincident cyclone-shaped aurora caused by electron precipitation...
ΣO/N 2 ratios in the Earth's thermosphere are measured by Global Ultraviolet Imager (GUVI) on TIMED satellite, and demonstrate strong 9 7 day oscillations 2005 2006, respectively, that well correlated with solar wind speed Kp index. This work builds recently discovered connection between rotating coronal holes thermospheric mass density variations. The described here is first description of geomagnetically forced periodicities neutral composition. Furthermore, these observations provide...
Abstract This special collection includes 31 research papers investigating geospace system responses to the geomagnetic storms during St. Patrick's Days of 17 March 2013 and 2015. It covers observation, data assimilation, modeling aspects storm time phenomena their associated physical processes. The ionosphere thermosphere as well coupling magnetosphere are clearly main subject areas addressed. provides a comprehensive picture response these two major storms. We provide some highlights...
Abstract In this paper, an ionospheric electron density reanalysis algorithm was used to generate global optimized during the 17–18 March 2013 geomagnetic storm by assimilating ~10 low Earth orbit satellites based and ~450 ground navigation satellite system receiver‐based total content into a background model. The reanalyzed could identify large‐scale features quite well time, including storm‐enhanced density, positive effect initial main phases, negative recovery phase. simulations from...
The substorm current wedge (SCW) is a fundamental component of geomagnetic substorms. Models tend to describe the SCW as simple line flowing into ionosphere toward dawn and out dusk, linked by westward electrojet. We use multispacecraft observations from perigee passes Cluster 1 4 spacecraft during on 15 January 2010, in conjunction with ground‐based observations, examine spatial structuring temporal variability SCW. At this time, traveled east‐west azimuthally above auroral region. show...
Abstract Energy circulation in geospace lies at the heart of space weather research. In inner magnetosphere, steep plasmapause boundary separates cold dense plasmasphere, which corotates with planet, from hot ring current/plasma sheet outside. Theoretical studies suggested that surface waves related to sharp inhomogeneity exist and act as a source geomagnetic pulsations, but direct evidence their role magnetospheric dynamics have not yet been detected. Here, we show observations wave its...
Abstract Solar eruptions cause geomagnetic storms in the near‐Earth environment, creating spectacular aurorae visible to human eye and invisible dynamic changes permeating all of geospace. Just equatorward aurora, radars satellites often observe intense westward plasma flows called subauroral polarization streams (SAPS) dusk‐to‐midnight ionosphere. SAPS occur across a narrow latitudinal range lead frictional heating ionospheric atmospheric neutral gas. also generate small‐scale waves density...
Abstract We analyzed far ultraviolet data from Defense Meteorological Satellite Program (DMSP)/Special Sensor Ultraviolet Spectrographic Imager (SSUSI) and Thermosphere Ionosphere Mesosphere Energetics Dynamics (TIMED)/Global (GUVI) found significant changes in the thermospheric density composition during 3–5 February 2022 storm when 40 Starlink satellites started to re‐enter atmosphere associated with increased neutral drag at an altitude around 210 km. The standard NRLMSISE‐00 model...
Abstract Energetic particle precipitation is the major source of electron production that controls ionospheric Pedersen and Hall conductances at high latitudes. Many studies use empirical formulas to estimate conductances. The spectra measured by Defense Meteorological Satellite Program (DMSP) Special Sensor J are often used as input formulas. In this study, we evaluate during four different types auroral conditions based on 63 conjugate events observed DMSP EISCAT. calculated from data with...