A5101734610- Ionosphere and magnetosphere dynamics
- Earthquake Detection and Analysis
- GNSS positioning and interference
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Atmospheric Ozone and Climate
- Ocean Waves and Remote Sensing
- Astro and Planetary Science
- Tropical and Extratropical Cyclones Research
- Meteorological Phenomena and Simulations
- Oceanographic and Atmospheric Processes
- Computational Physics and Python Applications
- Atmospheric aerosols and clouds
- earthquake and tectonic studies
- Geophysical Methods and Applications
- Geophysical and Geoelectrical Methods
- Seismic Waves and Analysis
National Engineering Research Center of Electromagnetic Radiation Control Materials
2010-2024
Yunnan Environmental Protection Bureau
2024
Qujing Normal University
2023-2024
University of Chinese Academy of Sciences
2023
Chinese Academy of Meteorological Sciences
2012-2018
Chinese Academy of Sciences
2006-2018
We report two lower thermospheric‐enhanced sodium layer (TeSL) cases observed at a low‐latitude station, Lijiang, China (26.7°N, 100.0°E), on 10 March and April 2012, respectively. The TeSLs in the were located altitudes near 122 112 km, In addition, strong sporadic layers (SSLs) 100 km accompanied TeSL 2012. Both SSLs exhibited tidal‐induced downward motion. adjacent ground‐based space‐borne ionospheric radio observations showed E s before appearance of TeSLs, suggesting an “ – (SSLs)”...
The disturbances of the ionosphere caused by thunderstorms or lightning events in troposphere have an impact on global navigation satellite system (GNSS) signals. Gravity waves (GWs) triggered are one main factors that drive short-period Travelling Ionospheric Disturbances (TIDs). At mid-latitudes, ionospheric GWs can be detected GNSS However, at low latitudes, multi-variability leads to difficulties identifying induced through data. Though during low-latitude been investigated, explicit GW...
Ionospheric irregularities are an important phenomenon in scientific studies and applications of radio-wave propagation. Spread-F echoes ionograms a type high-frequency band that include frequency spread-F (FSF), range (RSF), mixed (MSF) events. In this study, we obtained data from four ionosondes at low- mid-latitudes near the 120°E chain China during 23rd solar cycle. We used these to investigate occurrence percentages variations with local time, season, latitude, activity. The were...
The Qujing incoherent scatter radar (QJISR), the first one in China with geographic location (25.6°N, 103.8°E), was brought into operation since spring of 2014. QJISR a mono-static pulsed working operating frequency 500 MHz, peak power 2 Megawatt, and 29-m steerable parabolic dish. This paper mainly presents basic configuration implementation QJISR, including antenna, transmitter, receiver, signal processing, data analysis. Some preliminary observation results are also reported raw echo,...
Abstract In this study, we present some new features of the enhancements electron density in ionospheric F region at low latitudes. The peak parameters ionosphere were recorded by Sanya (109.6°E, 18.3°N) ionosonde and profiles analyzed measured Qujing (103.8°E, 25.6°N) incoherent scatter radar. 2 layer ( NmF 2) is found to be enhanced afternoon sunset hours. Common cases demonstrate that increases latitudes are characterized a descent height hmF 2). Meanwhile, shows an increase bottom...
Abstract The day‐to‐day variability of the ionospheric electron density and its longitudinal gradient challenges our description understanding ionosphere, which is also essential for reliable applications Global Navigation Satellite System (GNSS). In this paper we conduct a case study anomalous enhancements in to reveal spatial extent related drivers enhancements. data analyzed include vertical total content (TEC) by receivers, peak (NmF2) height (hmF2) F layer chain ionosondes, profiles...
Abstract The real‐time automatic acquisition and analysis of ionospheric parameters play important roles in monitoring forecasting the space weather. For scaling parameters, a method based on empirical orthogonal function (EOF) electron density profiles is proposed this paper. This applied to measured ionograms by CADI (Canadian Advanced Digital Ionosonde), which set up at Beijing Space Environment Observation Station (40.3°N, 116.2°E). results show that owns good reliability universality....
Using the support vector machine (SVM), an empirical local ionospheric forecasting model over Lanzhou (ELIFMOL) has been developed to predict critical frequency of F 2 layer ( f o ) during disturbed geomagnetic conditions. This study focuses on reliable prediction storms, which is important for practical applications as well further understanding storm dynamics. In this paper, we investigate whether conditions at a single station can be predicted one hour ahead by using some inputs SVM...
Abstract A rare minor sudden stratospheric warming is observed in the Antarctic polar region during September 2019, which results enhancement of a westward wavenumber 1 quasi‐6‐day wave (Q6DW) mesopause region. The impacts this Q6DW event to ionosphere are then comparatively investigated with multiple data sets, including ground‐based total electron content (TEC) from geostationary BeiDou satellite receivers and F2 layer maximum frequency (foF2) ionosondes ranging 20 40°N over eastern Asia....
So far, the least is known about D-region ionosphere out of entire due to lack a conventional detecting method and continuous data accumulation. Medium frequency (MF) radar an important tool for understanding by measuring electron density (Ne) within height range 60–90 km. To investigate statistical variation D-region, especially at mid-low latitude area, this study presents variations in Ne with solar zenith angle (SZA), season, altitude observed Kunming MF (25.6° N, 103.8° E) under low...
Spread-F is known as the electron density inhomogeneous structures in F layer of ionosphere and can usually be classified frequency spread-F (FSF) range (RSF). Few studies have reported on statistical characteristics occurrences at midlatitudes Eastern Asia, particularly comparison between China Japan. In this paper, we used data recorded by ten ionosondes located 25°N 45°N from 1997 to 2016, investigate longitudinal differences occurrence probable mechanism for its Asia. Variations with...
The Fabry–Pérot interferometer (FPI) and meteor radar are two important techniques for measuring the horizontal wind field in mesopause region, observations of which still lack comprehensive comparison. Kunming Observatory (25.6°N,103.8°E) has deployed both instruments recent years provides collocated FPI observations. measures fields over 24 hours every day continuously, whereas can only work during night with clear air condition. data from 892.0-nm airglow emission (with a peak height at...
The Solar wind Magnetosphere Ionosphere Link Explorer (SMILE) satellite is a small magnetosphere–ionosphere link explorer developed cooperatively between China and Europe. It pioneers the use of X-ray imaging technology to perform large-scale Earth’s magnetosheath polar cusp regions. uses high-precision ultraviolet imager image overall configuration aurora monitor changes in source solar real time, using situ detection instruments improve human understanding relationship activity magnetic...
By using the ionosonde data at Haikou, China over time period of 1996-2006, this paper analyses diurnal and seasonal behaviour ionospheric MUF variability low latitude. Data used in study are critical frequency foF2 propagation factor M(3000)F2 with hourly interval resolution. Four parameters including upper quartile(Qup), lower quartile(Qlo), monthly inter-quartile(DeltaMUF) their percentage ratio(DeltaMUF(%)) to medians as quantitative measurement study, where latter averages these...
利用多个电离层垂测站的数据和IGS-TEC数据资料, 结合日地空间环境指数, 分析了2009年7月22日日全食期间中国地区电离层参量(反射回波最低频率fmin及f0F2和TEC)的变化特征. 结果表明, 日食发生后fmin迅速降低, 日食结束后fmin迅速恢复到正常水平; 在食甚时刻附近, f0F2和TEC出现明显的降低, 显示了明显的光食效应. 日食结束后5~6 h, f0F2和TEC出现不同程度的正扰动, 在驼峰区更明显; 日食结束后9~10 f0F2和TEC出现较显著的负扰动. 由于此次日食发生时伴随着中等强度的磁暴和低纬电场穿透等空间天气事件, 给此次日食电离层效应的深入分析带来很大困难.
The all-sky meteor radar is an important means to detect 70–110 km wind fields. Previous studies have shown that the field retrieved by radars closely related count detected radar. However, precision of still unclear. In this paper, influence counts two operating simultaneously at Kunming station on fields analyzed based observations from 1 November 2013 31 December 2014. First, are approximately 100–3000 per hour, and 37.5 MHz more than according 53.1 vary with local time altitude. 20 UTC...
Gravity wave (GW) activities play a prominent role in the complex coupling process of wave–wave and wave–background circulation around mid-low-latitude equatorial areas. The wavelengths are wide, from about 10 m to 100 km, with period minutes hours. However, oscillations GW apparently different between bands 0.1 1 h (HF) 5 (LF). To further understand characteristics activities, neutral winds during 2008–2009 resolution 3 min obtained medium-frequency (MF) radar Kunming (25.6° N, 103.8° E)...
We presented in this paper the ionosphere variation characteristics during solar flares with location, season and activity level at Kunming site (25.6°N, 103.8°E), using data measured by MF radar ionosonde. Results showed: (1) maximum amplitudes both D region f <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">min</inf> appeared near noon; there was no strict corresponding relationship between F layer critical frequency (foF2) location time. (2)...
In 2024, the Chinese Meridian Project (CMP) completed its construction, deploying 282 instruments across 31 stations. This achievement not only provides a robust foundation but also serves as reference template for International Circle Program (IMCP). The IMCP aims to integrate and establish comprehensive network of ground-based monitoring stations designed track propagation space weather events from Sun Earth. Additionally, it monitors various disturbances generated within Earth system that...