A5006044524- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Earthquake Detection and Analysis
- GNSS positioning and interference
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Planetary Science and Exploration
- Geophysics and Gravity Measurements
- Space Science and Extraterrestrial Life
- Adversarial Robustness in Machine Learning
- Innovative Microfluidic and Catalytic Techniques Innovation
- earthquake and tectonic studies
- Reinforcement Learning in Robotics
- Space Exploration and Technology
- Seismic Waves and Analysis
- Meteorological Phenomena and Simulations
- Smart Grid Security and Resilience
- Machine Learning in Materials Science
- Geophysical Methods and Applications
- Oxidative Organic Chemistry Reactions
- Microfluidic and Capillary Electrophoresis Applications
- Ion Channels and Receptors
- Fault Detection and Control Systems
- Gut microbiota and health
University of Chinese Academy of Sciences
2016-2025
Institute of Geology and Geophysics
2016-2025
Chinese Academy of Sciences
2016-2025
Pharmaron (United Kingdom)
2025
Chinese People's Armed Police Force
2024
University of Wisconsin–Madison
2019-2024
West China Hospital of Sichuan University
2020-2024
Chinese People's Armed Police Force Engineering University
2024
Sichuan University
2020-2024
Nanjing University of Aeronautics and Astronautics
2023
This paper shows that the relationship between solar EUV flux and F-10.7 index during extended minimum (Smin) of 2007-2009 is different from in previous Smin. difference also seen f(o)F(2) F-10.7. We collected SOHO/SEM observations index, through June 2010, to investigate irradiance recent find that, owing decreased last Smin one with amplitudes (larger flux), significantly lower than for same Namely, does not describe as it did That caused remarkable responses ionospheric f(o)F(2). For...
We analyzed the data series of total electron content (TEC) derived at Jet Propulsion Laboratory from Global Positioning System (GPS) observations to investigate solar activity effects TEC on a global scale. The daily values extreme ultraviolet (EUV) fluxes in 0.1–50 nm wavelengths, 10.7 cm radio flux F , and 10.7P (the average its 81‐day mean 10.7A ) are adopted represent EUV variability, respectively. measured by Solar Monitor (SEM) spectrometer aboard Heliospheric Observatory (SOHO)....
[1] A critical question in ionospheric physics is the state of ionosphere and relevant processes under extreme solar activities. The activity during 2007–2009 extremely prolonged low, which offers us a unique opportunity to explore this issue. In study, we collected global ionosonde measurements F2 layer frequency (foF2), E (foE), F virtual height (h′F) total electron content (TEC) maps produced by Jet Propulsion Laboratory, were retrieved from dual-frequency GPS receivers distributed...
In this study, the ionospheric electron density profiles retrieved from radio occultation measurements of Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) mission are analyzed to determine F-2 layer maximum (NmF2), peak height (h(m)F(2)), Chapman scale (H-m). During deep solar minimum 2008-2009, NmF2, h(m)F(2), H-m show complicated seasonal variations, which generally consistent with those in previous minima. Besides equinoctial asymmetry, nonseasonal...
Abstract The 2015 St. Patrick's Day geomagnetic storm with SYM‐H value of −233 nT is an extreme space weather event in the current 24th solar cycle. In this work, we investigated main mechanisms profound ionospheric disturbances over equatorial and low latitudes Asian‐Australian sector American during super event. results reveal that disturbed electric fields, which comprise penetration fields (PEFs) disturbance dynamo (DDEFs), play a decisive role effects latitude regions. PEFs occur on 17...
The longest total solar eclipse of this century occurred in East and South Asia on 22 July 2009. was accompanied with a medium magnetic storm, whose main phase onset ∼27 min after the passage Moon's umbral shadow. Using TEC data from 60 GPS stations, we construct differential maps to investigate ionosphere response central China range 26°N–36°N, 108°E–118°E (i.e., latitude 15°N–25°N). During eclipse's totality, “shadow” shown as depletion area formed ∼100 km south path maximum decrease 5...
The electron density in the ionospheric F region occasionally stops its decay and rises pronouncedly during night hours, which are termed nighttime enhancements. In this case study, we analyzed manually scaled ionogram records measured by a Lowell DPS‐4D ionosonde operated at Sanya (18.3°N, 109.6°E), China, to explore postmidnight enhancement events occurred 2012, year of moderate solar activities. Common features these cases illustrate that, accompanying peak F2 layer (NmF2), height is...
In this study, we studied the ionospheric responses to solar flares during 1999–2006 by using GOES 0.1–0.8 nm X‐ray, 26–34 EUV, and GPS/total electron content (TEC). The zenith angle (SZA) dependence was quantitatively investigated analyzing global TEC enhancements about 100 X‐class flares. mean ratio of Δ at SZA = 90° 0° is 0.39. statistical results show that a limb flare has less effect on ionosphere than central does because main ionization source ionosphere, EUV radiation, can be...
[1] The equinoctial asymmetry of the ionospheric vertical E × B plasma drift velocity (V⊥) in equatorial F region is investigated based on observations from ROCSAT-1 during 1999 to 2004. It found that observed exhibits obvious local time dependence with three noticeable features. First, Eastern Hemisphere interval between 0900 and 1300 LT, V⊥ obviously higher at northern spring equinox (March–April) than autumn (September–October). Second, there a pronounced for wave number 4 longitudinal...
Abstract Previous investigations on ionospheric responses to solar flares focused mainly the photoionization caused by increased X‐rays and extreme ultraviolet irradiance. However, little attention was paid related electrodynamics. In this letter, we explored equatorial electric field (EEF) electrojet (EEJ) in ionosphere at Jicamarca during from 1998 2008. It is verified that increase dayside eastward EEJ but decrease EEF, revealing a negative correlation between EEF. The decreased EEF...
An intramolecular cyclization strategy to synthesize nitrogen-rich and biologically important 2-heteroaryl-indolin-3-ones has been developed in both batch flow. Using high-throughput screening, citric acid a dimethylformamide/water mixture was found facilitate the reaction under conditions, which can tolerate substituted phenyl rings, quinolines, naphthalenes with variety of electronic steric properties. The reoptimized for flow conditions using design experiments, complementing some...
The Michelson interferometer for global high-resolution thermospheric imaging (MIGHTI) aboard the NASA ionospheric connection (ICON) satellite offers extensive atmospheric wind field data mid-latitude regions and has recently released its version 5 (v05) data. We conducted a comprehensive comparison validation of MIGHTI v05 level 2.2 period from December 2019 to October 2022, covering all in orbit. In raw speeds, demonstrates good agreement with ground-based Fabry–Pérot (FPI), meteor radars,...
Abstract We used the incoherent scatter radar observations at Sanya (18.3°N, 109.6°E) and Jicamarca (11.9°S, 76.9°W) to analyze day‐night difference of penetration electric fields during 10 May 2024 superstorm. The dawn‐dusk field penetrated into night ionosphere more efficiency, night‐to‐day ratio was ∼2. Specially, zonal became westward in post‐midnight, while it did not change significantly afternoon response IMF‐Bz southward turning 17:45–18:25 UT 19:30–22:30 UT. These indicated that...
Monthly median N m F 2 (maximum electron density of the ‐layer) data at Okinawa, Yamagawa, Kokubunji, and Wakkanai have been collected to investigate solar activity dependence nighttime ionosphere. The result shows that there are seasonal latitudinal differences variation . main effects as follows: increases with 107 linearly in equinoctial months (March September), it tends saturate increasing summer solstice month (June). What is peculiar an amplification trend winter (December)....
[1] We investigate the extreme ionospheric effect during intense solar flare (X17.0/3B) that occurred on 7 September 2005. A strong E region electron density enhancement is observed by incoherent scatter radars at Millstone Hill, Sondrestrom, and Tromsø, as well radio occultation experiment board CHAMP satellite. The observations from both Hill Sondrestrom stations show average percentage enhancements of 17:40–18:10 UT are more than 200% near peak height but only about 10% F height; a...
Abstract Although the equatorial ionization anomaly (EIA) has been widely studied, it was seldom investigated from observations for topside ionosphere. In this paper, climatology characteristics of latitudinal structure ion density ( N i ) were in detail using ROCSAT‐1 and DMSP observations. EIA double‐peak may exist at 600 km, depending on longitude, local time, season, solar activity, while is not a prevalent characteristic 840 km even maximum sunset. Local time evolution presented. The...
Abstract We collected total electron content (TEC) data in the longitudinal sector of 60°W–90°W during 1999–2015 to investigate latitudinal variation nighttime middle‐ and high‐latitude ionosphere. The midlatitude trough is one important features statistical analysis provides unprecedented detail local time, seasonal, solar activity, geomagnetic activity variations latitude range 40°N–75°N, focusing on trough. results show that minimum position has significant dependences but slight...
Abstract We investigate the ionospheric response to 21 June 2020 annular solar eclipse using multiinstrument observations including ionosondes, Global Navigation Satellite System (GNNS) receivers, COSMIC2, and DMSP SWARM satellites. During course of eclipse, total electron content (TEC) decreased slightly in morning at 20–70°E largely afternoon 80–150°E. However, maximum TEC depletion did not occur obscuration, but stayed close southern edge running totality during near northern elapsed...
Abstract In this study, we utilize ICON observations from 2019 to 2022 analyze the variability of vertical plasma drift and its relationship with neutral winds. The results reveal that there are 19% downward drifts at 13–17 LT, which changes seasons longitudes. occurs less frequently compared contemporaneous counter electrojet during solstices. We identify between north foot magnetic zonal meridional wind profiles 90–300 km altitudes. As become small or downward, winds display diverse...