A5101690333- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- GNSS positioning and interference
- Astro and Planetary Science
- Earthquake Detection and Analysis
- Planetary Science and Exploration
- Plasma Diagnostics and Applications
- Geophysics and Gravity Measurements
- Methane Hydrates and Related Phenomena
- Laser-induced spectroscopy and plasma
- Climate change and permafrost
- Space Exploration and Technology
- Ocular and Laser Science Research
- Magnetic confinement fusion research
- Lightning and Electromagnetic Phenomena
- Artificial Intelligence in Healthcare
- Electrohydrodynamics and Fluid Dynamics
- High voltage insulation and dielectric phenomena
- Environmental and Agricultural Sciences
- Atmospheric aerosols and clouds
- Tropical and Extratropical Cyclones Research
- Remote Sensing and Land Use
- Seismology and Earthquake Studies
- Spacecraft and Cryogenic Technologies
Shandong University
2016-2025
Institute of Space Sciences
2017-2025
Space Engineering University
2024
Institute of Space Science - INFLPR Subsidiary
2017-2019
University of Michigan
2008
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...
Abstract First experimental proof of a clear and strong dependence the standard phase scintillation index (σ φ ) derived using Global Positioning System measurements on ionospheric plasma flow around noon sector polar ionosphere is presented. σ shows linear drift speed measured by Super Dual Auroral Radar Network radars, whereas amplitude (S 4 does not. This observed can be explained as consequence Fresnel frequency relative used constant cutoff (0.1 Hz) to detrend data for obtaining . The...
Abstract A comparison tool has been developed by mapping the global GPS total electron content (TEC) and large coverage of ionospheric scintillations together on geomagnetic latitude/magnetic local time coordinates. Using this tool, a between large‐scale irregularities is pursued during storm. Irregularities, such as storm enhanced density, middle‐latitude trough, polar cap patches, are clearly identified from TEC maps. At edges these irregularities, clear appeared but their behaviors were...
Abstract Based on in situ and ground‐based observations, a new type of “polar cap hot patch” has been identified that is different from the classical polar enhanced density structure (cold patches). Comparing with patches, which are transported dayside sunlit region dense cold plasma, patches associated particle precipitations (therefore field‐aligned currents), ion upflows, flow shears. The may have same order enhancement as topside ionosphere, suggesting be produced by photoionization...
Significance Colorful and dynamic aurora has attracted human’s attention since the dawn of time. However, mystery remains in understanding a distinct class aurora, transpolar auroral arc (TPA) (or “theta” aurora) which occurs extremely high latitude Earth polar regions when interplanetary magnetic field (IMF) is northward. Previous theories are unable to explain why multiple TPAs often occur. Our comprehensive observations ionosphere magnetotail as well three-dimensional magnetosphere...
A train of large-scale polar cap patches was observed in the ionosphere during a period southward interplanetary magnetic field (IMF) main phase moderate geomagnetic storm. The were sequentially detached from dayside storm enhanced density plume through cusp dynamics due to pulsed enhancement reconnection rate, suggested by increase Kan-Lee electric and cross potential. After formation IMF By duskward turning, propagated obliquely like 'waves' towards dusk sector, exited over wide local time...
Abstract The semiannual anomaly, characterized by increased peak electron density in the F2 layer (NmF2) at equinoxes compared to solstices, remains incompletely elucidated, especially high latitudes. magnetospheric convection pattern introduces additional complexity its formation mechanisms. This study utilized NCAR Thermosphere‐Ionosphere‐Electrodynamics General Circulation Model (TIEGCM) explore anomaly Zhongshan Station (ZHS), Antarctica, focusing on processes occurring polar upper...
For decades, the Rate of Change Total Electron Content Index (ROTI) has been employed to monitor and quantify ionospheric irregularities, serving as a potential substitute for standard scintillation indices. However, date, ROTI not sufficiently investigated in terms its relationship with This study presents preliminarily statistical analysis between indices using GPS receivers from Canadian High Arctic Ionospheric Network (CHAIN) over 5-year period 2011 2015. Our results show that increases,...
Abstract The space hurricane is a polar cap auroral structure with strong flow shears and intense particle precipitation that can disturb the thermosphere under quiet geomagnetic conditions. Here statistical characteristics of this interaction are surveyed using data from Defense Meteorological Satellite Program Gravity Field Steady‐State Ocean Circulation Explorer satellites. results confirm hurricanes modify ion neutral circulation in through enhanced electric fields. Local precipitation,...
Abstract We report simultaneous global monitoring of a patch ionization and in situ observation ion upflow at the center polar cap region during geomagnetic storm. Our observations indicate strong fluxes upwelling O + ions originating from frictional heating produced by rapid antisunward flow plasma patch. The statistical results crossings central Defense Meteorological Satellite Program F16–F18 2010 to 2013 confirm that field‐aligned can turn upward when flows appear, with consequent...
Abstract The Earth’s magnetosphere is the region of space where plasma behavior dominated by geomagnetic field. It has a long tail typically extending hundreds Earth radii ( R E ) with plentiful open magnetic fluxes threading magnetopause associated reconnection and momentum transfer from solar wind. open-flux greatly reduced when interplanetary field points northward, but extent magnetotail remains unknown. Here we report direct observations an almost complete disappearance polar cap...
Abstract We report results from the analysis of a case conjugate polar cap arcs (PCAs) observed on 5 February 2006 in Northern Hemisphere by ground‐based Yellow River Station all‐sky imager (Svalbard) and both hemispheres space‐based DMSP/SSUSI TIMED/GUVI instruments. The PCA's motion dawn‐dusk direction shows clear dependence interplanetary magnetic field (IMF) B y component presents asymmetry between Southern Hemispheres, that is, formed duskside moving dusk to dawn vice versa other...
Abstract The term of “polar cap hot patch” is a newly identified high‐density plasma irregularity at high latitudes, which associated with electron temperature and particle precipitation, while classical polar patch has lower temperature. To investigate characteristics patches versus patches, five years in situ database observations from the DMSP satellites was analyzed. For first time, we show how ion/electron ratio (or difference) can be used to distinguish between patches. ( T i / e >...
Abstract By analyzing a five‐year period (2010–2014) of Defense Meteorological Satellite Program (DMSP) plasma data, we investigated ion upflow occurrence, speed, density, and flux above the polar cap in northern hemisphere under different solar zenith angle (SZA), activity (F10.7), convection speed. Higher occurrence rates dawn sector are associated with regions higher while dusk is density. The increases speed but decreases SZA. Upflow lowest when SZA > 100° speeds low. While, velocity...
Abstract Using two B‐spline basis functions of degree 4 and the ionospheric scintillation data from a Global Positioning Satellite System (GPS) receiver at South Pole, we reproduced indices for periods six X‐class solar flares in 2013. These have filled gaps, they are serving as smooth replica real observations. In either event, these modeled minimizing geometrical effects between GPS satellite receiver. Six been studied during summer winter months, using produced based on observations Pole...
Abstract Regions 1 and 2 (R1 R2) field‐aligned currents (FACs), manifestations of large‐scale convection in Earth's magnetosphere‐ionosphere (M‐I) system, often contain intense FAC layers mesoscale latitudinal width near the R1/R2 interface. We refer to such as “embedded” R1 R2 FACs. Likely resulting from enhanced convection, these FACs may indicate M‐I configuration change contribute significantly substorm current wedges. present several events which embedded were observed by low‐altitude...
Abstract We present a statistical study of the ion upflow associated with subauroral polarization streams (SAPS) in ionospheric region at different substorm times using three Defense Meteorological Satellite Program satellite (F16–F18) data for five years (2010–2014) Northern Hemisphere. The results show similarities between SAPS and intensity substorms both occurrence rate distribution velocity distribution. In comparison to SAPS, shows smaller lower velocity. also find that frictional...
Abstract A statistical study of ion upflow and field‐aligned currents (FACs) has been performed in the topside ionosphere both hemispheres for magnetic quiet disturbed times by using DMSP satellite observations from 2010–2013. Distributions MLT/MLat reveal that occurrence shows a dawn‐dusk asymmetry distribution matches well with Region 1 FACs. In addition, there are highest regions near noon within midnight auroral disturbance area, corresponding to dayside cusp nightside regions,...
Abstract Following substorm auroral onset, the active aurora region usually expands poleward toward boundary. Such expansion is often associated with a bulge that westward and forms travelling surge. In this study, we show all‐sky imager Poker Flat Advanced Modular Incoherent Scatter Radar observations of two surge events to investigate relationship between ionospheric flows likely have polar cap origin. For both events, observe streamers, an adjacent flow channel consisting decreased...
Abstract This paper is a statistical survey of polar cap patches in relation to solar and geomagnetic activity. Ten thousand six hundred eighty‐eight have been identified from situ plasma observations the Defense Meteorological Satellite Program F16 satellite for 14 years (2005–2018). These are divided into two groups: (a) cold patches, which consist dense but plasma; (b) hot plasma. The results indicate that occurrence clearly dependent on activity, don not show such dependence; both...
Abstract The dependencies of global positioning system (GPS) scintillation indices on ionospheric plasma flow and the rate change total electron content (TEC) around dawn sector for first time polar ionosphere are investigated. phase index ( σ φ ) derived from GPS measurements Canadian High Arctic Ionospheric Network (CHAIN) shows linear both drift speed measured by SuperDARN radar TEC estimated receivers CHAIN. However, amplitude (S 4 does not show any dependence or TEC. These results...