Guozhu Li

Guozhu Li
Institute of Geology and Geophysics, Chinese Academy of Sciences

PhD

About

130
Publications
21,846
Reads
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2,166
Citations
Citations since 2017
89 Research Items
1534 Citations
20172018201920202021202220230100200300400
20172018201920202021202220230100200300400
20172018201920202021202220230100200300400
20172018201920202021202220230100200300400
Introduction
We are currently developing an Ionospheric Observation Network for Irregularity and Scintillation in East/Southeast Asia (IONISE, http://ionise.geophys.ac.cn/), which includes three crossed chains of GNSS TEC/scintillation receivers along 110°E, 23°N and 40°N, multistatic portable digital ionosondes, and VHF radars, for tracing the occurrence and movements of irregularities producing scintillations and capturing ionospheric disturbances of various scales over southern China and adjacent regions.
Additional affiliations
January 2015 - September 2022
Chinese Academy of Sciences
Position
  • Professor
January 2010 - January 2015
Chinese Academy of Sciences
Position
  • Professor
Education
September 2002 - July 2007
September 1998 - July 2002
Wuhan University
Field of study
  • electronics

Publications

Publications (130)
Article
Full-text available
The small-scale wave-like structure (SSWS) of F region bottomside plasma density was proposed to be an important seeding for equatorial plasma bubble (EPB) generation, and employed in theoretical simulations of EPBs in recent years. The seeding role of SSWS, however, is waiting to be demonstrated by observation. Here we present two cases of SSWS an...
Article
Full-text available
All‐sky interferometric meteor radar has been operated worldwide for the measurements of neutral winds in the mesopause region. In this paper, we employ an all‐sky meteor radar and an ionospheric radar, which are situated at Ledong (18.4°N,109°E) and Sanya (18.3°N,109.6°E) respectively and both have the interferometry capability, to study the zonal...
Article
Full-text available
Equatorial plasma bubbles (EPBs) can cause rapid fluctuations in amplitude and phase of radio signals traversing the ionosphere and in turn produce serious ionospheric scintillations and disrupt satellite-based communication links. Whereas numerous studies on the generation and evolution of EPBs have been performed, the prediction of EPB and ionosp...
Article
Full-text available
Plain Language Summary Equatorial plasma plumes, which are known as vertically elongated irregularity structures over the magnetic equator, have been widely accepted as being generated at nighttime. The plumes usually disappear before sunrise. At daytime, there are very few reported cases of F‐region backscatter echoes. It is still not clear what c...
Article
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Unexpected daytime F-region irregularities following the appearance of an ionospheric hole have been observed over low latitude. The irregularities developed initially above the F-region peak height (~ 360 km) with a thickness of about 30 km and an east-west extension of more than 200 km around 1057 LT and then expanded upward to 500 km altitude be...
Article
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Using observations from the Ionospheric Connection Explorer satellite, the occurrence characteristics of daytime plasma density irregularities in the low latitude topside F region at solar minimum were studied. The results show that the occurrence characteristics of daytime topside irregularities during June solstice resembled those at solar maximu...
Article
Full-text available
Plain Language Summary The characteristics of E region field‐aligned irregularities (FAIs) were traditionally investigated by using narrow beam radars, which direct the majority of power into a narrow direction perpendicular to the geomagnetic field. Due to the limited field‐of‐view of narrow beam radars, the spatial structure and dynamics of E reg...
Article
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By using fast ionogram observations, we report the first simultaneous observations of ascending ion layers at equatorial and low latitudes. The ionosonde measurements at Sanya (18.3°N, 109.6°E; dip lat. 12.2°N) and Chumphon (10.7°N, 99.4°E; dip lat. 3.8°N) show that a high Es layer, which might contain metallic ions, was directly lifted upward from...
Article
We present an analysis of the response of quasi-10-day waves (Q10DWs) to the sudden stratospheric warming (SSW) event which occurred on March 23, 2020. The Q10DWs are observed in the mesosphere and lower thermosphere (MLT) region by three meteor radars, which are located at middle latitudes along the 120°E meridian from Mohe (MH, 53.5°N, 122.3°E),...
Article
Full-text available
Long-lived nonspecular meteor echoes backscattered from meteor trail non-field-aligned irregularities (NFAIs) were observed sporadically at high latitudes. In this study, we employ the observations by the all-sky radar of Meteor and ionospheric Irregularity Observation System (MIOS) at Ledong (18.4°N,109°E) in October 2018, January, April, and July...
Article
The observations of short-duration meteor showers at different geographic locations are important for well understanding their outbursts. Using the four all-sky interferometric meteor radars at Mohe (53.49N, 122.34E), Beijing (40.3N, 116.19E), Wuhan (30.54N, 114.34E) and Ledong (18.44N, 108.97E) in China, four outbursts (2011, 2012, 2018 and 2019)...
Article
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We present a study on the long‐term variation of lunar semidiurnal (LSD) tides in the mesosphere and lower thermosphere (MLT). The study is based on a meteor radar chain along ∼120°E meridian, which consists of five stations located at Mohe (MH, 53.5°N, 122.3°E), Beijing (BJ, 40.3°N, 116.2°E), Wuhan (WH, 30.5°N, 114.6°E), Sanya (SY, 18.3°N, 109.6°E...
Article
Full-text available
The Hunga-Tonga volcano eruption at 04:14:45 UT on 15 January 2022 produced various waves propagating globally, disturbing the background atmosphere and ionosphere. Coinciding with the arrival of perturbation waves, several equatorial plasma bubbles (EPBs) were consecutively generated at post-sunset hours over the East/Southeast Asian region, with...
Preprint
Full-text available
The Hunga-Tonga volcano eruption at 04:14:45 UT on 15 January 2022 produced various waves propagating globally, disturbing the background atmosphere and ionosphere. Coinciding with the arrival of perturbation waves, several equatorial plasma bubbles (EPBs) were consecutively generated at post-sunset hours over the East/Southeast Asian region, with...
Article
Full-text available
Using meteor radar measurements at Mohe (MH, 53.5°N, 122.3°E) and the reanalysis data from 2011 to 2020, the characteristics of intraseasonal oscillations (ISOs) in the mesosphere and lower thermosphere (MLT) region over MH are investigated for the first time. The radar observation shows a prominent ISO with periods of 40–60 days in the zonal wind...
Article
Full-text available
This study reports unexpected strong longitudinal structures from Global Navigation Satellite System (GNSS) derived total electron content (TEC) observations in the low-latitude ionosphere over Asia. The observations during 2019–2020 show diverse patterns in the zonal difference of regional TEC, even under geomagnetically quiet conditions. The TEC...
Article
Full-text available
The Meteor and ionospheric Irregularity Observation System (MIOS), which consists of multi‐station optical subsystem at Ledong (18.4°N, 109°E) and Sanya (18.3°N, 109.6°E), and radar subsystem including a 38.9 MHz all‐sky interferometric radar and a 47.5 MHz coherent phased array radar at Ledong, has been in full operational since December 2021. Thi...
Article
Full-text available
Plain Language Summary The Arctic stratospheric polar vortex is extremely strong in the winter of 2020. Four polar warming events successively occur from November 2019 to March 2020. As a common feature, the enhancement of quasi‐10‐day waves (Q10DWs) are captured in the mesosphere and lower thermosphere (MLT) region over Mohe (53.5°N, 122.3°E) duri...
Article
Full-text available
Plain Language Summary Under geomagnetic storms, the daytime ionosphere may undergo significant plasma density depletion over wide longitude and latitude regions. Possible driving mechanisms of large‐scale plasma density depletion include the suppression of the fountain effect by westward equatorial electrojets, the upward plasma diffusion caused b...
Chapter
Data assimilation schemes blend observational data, with limited coverage, with a short term forecast to produce an analysis, which is meant to be the best estimate of the current state of the atmosphere. Appropriately specifying observation error statistics is necessary to obtain an optimal analysis. Observation error can originate from instrument...
Article
Full-text available
Zonal winds in the stratosphere and mesosphere play important roles in atmospheric dynamics and aeronomy. However, the direct measurement of winds in this height range is difficult. We present a dataset of the monthly mean zonal wind in the height range of 18-100 km and at latitudes of 50 • S-50 • N from 2002 to 2019, derived by the gradient balanc...
Article
Full-text available
A special F2 layer stratification structure named F3 layer occurs frequently in equatorial and low latitude ionosphere during summer daytime. In this study, a new phenomenon of decreasing occurrence of the F3 layer, and narrowing differences of virtual heights between the F3 and F2 layers in the recovery phase of geomagnetic storms is reported. We...
Article
Full-text available
Ionospheric scintillations caused by equatorial plasma bubbles (EPBs) can seriously affect various high technology systems based on Global Navigation Satellite System (GNSS) signals at equatorial and low latitudes. A reliable prediction of ionospheric scintillation occurrence is critical to relieve the effect. Using the long‐term ground‐based GNSS...
Article
Full-text available
Plain Language Summary The ionospheric sporadic E (Es) layer and associated irregularities were traditionally investigated and characterized based on observations from ground‐based radars, for example, ionosondes and very high frequency radars, which usually suffer from a small spatial distribution. Ever since strong Es were revealed to be detectab...
Article
Full-text available
We present an analysis of a quarterdiurnal tide (QDT) during the 2019 Arctic sudden stratospheric warming (SSW) event. The analysis is based on data obtained from a meteor radar located at Mohe (MH, 53.5°N, 122.3°E), China. The enhancement of the QDT amplitude is observed during the SSW and the maximum QDT amplitude is about 10 m/s in both neutral...
Article
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We investigated the variations of equatorial plasma bubbles (EPBs) in the East-Asian sector during a strong geomagnetic storm in October 2016, based on observations from the Beidou geostationary (GEO) satellites, Swarm satellite and ground-based ionosonde. Significant nighttime depletions of F region in situ electron density from Swarm and obvious...
Article
Full-text available
Large Scale Wave Structures (LSWS) in the equatorial ionospheric F-region were observed by measuring spatial and temporal variations within detrended total electron content (dTEC) data obtained by ground-based GNSS receivers over the South American continent. By using dTEC-maps, we have been able to produce, for the first-time, two-dimensional repr...
Article
The 2nd Equatorial Plasma Bubble (EPB) workshop, funded by the Institute of Geology and Geophysics, Chinese Academy of Sciences, and the National Natural Science Foundation of China, took place in Beijing, China during September 13–15, 2019. The EPB workshop belongs to a conference series that began in 2016 in Nagoya, Japan at the Institute for Spa...
Article
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Horizontal winds from four low‐latitude (±15°) specular meteor radars (SMRs) and the Michelson Interferometer for Global High‐resolution Thermospheric Imaging (MIGHTI) instrument on the ICON satellite, are combined to investigate quasi‐2‐day waves (Q2DWs) in early 2020. SMRs cover 80–100 km altitude whereas MIGHTI covers 95–300 km. Q2DWs are the la...
Article
Full-text available
Benefiting from the special design of BeiDou Navigation Satellite System (BDS) constellation, its Geostationary Earth Orbit (GEO) satellites observations can provide favorable conditions to investigate the ionospheric plasma bubble at low latitudes. This study proposes using BDS GEO Rate of Total Electron Content Index observations to analyze the e...
Article
Full-text available
The occurrence of midnight Equatorial Plasma Bubbles (EPBs) during the June solstice period of the ascending phase of solar cycle 24, from 2010 to 2014, was studied using data from the 47 MHz Equatorial Atmosphere Radar (EAR) at Kototabang, Indonesia. The analysis shows that the occurrence of midnight hour EPBs was at its maximum during the low sol...
Preprint
Full-text available
Zonal winds in the stratosphere and mesosphere play important roles in the atmospheric dynamics and aeronomy. However, the direct measurement of winds in this height range is difficult. We present a dataset of the monthly mean zonal wind in the height range of 18–100 km and at latitudes of 50° S–50° N from 2002 to 2019, which is derived by the grad...
Article
Full-text available
Mesospheric winds from two longitudinal sectors at 53°N latitude are combined to investigate quasi‐two‐day waves (Q2DWs) and their nonlinear interactions with tides. In a summer 2019 case study, we diagnose the zonal wavenumber m of spectral peaks at expected frequencies through two dual‐station approaches, a phase differencing technique (PDT) on i...
Article
Full-text available
A quasi‐27‐day wave (Q27DW) caused by the rotational period of solar radiation is commonly observed in the atmospheric dynamics. In the present study, we report an enhancement of a Q27DW during recurrent geomagnetic storms in the autumn of 2018 based on the zonal wind observations in the mesosphere and lower thermosphere (MLT) region over Beijing (...
Article
A Meteor and ionospheric Irregularity Observation System (MIOS) - optical subsystem, which currently consists of 26 video cameras (4 spectrographs) at two stations Sanya (18.3°N, 109.6°E) and Ledong (18.4°N, 109°E) separated by about 70 km was developed. One of the major goals of MIOS is to study how the entry of meteoroids into the Earth’s atmosph...
Article
Full-text available
Using total electron content (TEC) data from a chain of Beidou geostationary satellite TEC receivers along ∼110°E during 2016–2019, the local time, seasonal, and latitudinal occurrence characteristics of periodic TEC perturbation associated with medium scale traveling ionospheric disturbances (MSTIDs) are investigated. The results show that the day...
Article
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A rare minor sudden stratospheric warming is observed in the Antarctic polar region during September 2019, which results in the enhancement of a westward wavenumber 1 quasi‐6‐day wave (Q6DW) in the mesopause region. The impacts of this Q6DW event to the ionosphere are then comparatively investigated with multiple data sets, including the ground‐bas...
Article
Full-text available
We compare coincident thermospheric neutral wind observations made by the Michelson Interferometer for Global High-Resolution Thermospheric Imaging (MIGHTI) on the Ionospheric Connection Explorer (ICON) spacecraft, and four ground-based specular meteor radars (SMRs). Using the green-line MIGHTI channel, we analyze 1158 coincidences between Dec 2019...
Article
Full-text available
We present a study of the quasi 10‐day waves (Q10DWs) in the mesosphere and lower thermosphere (MLT) during a sudden stratospheric warming (SSW) event in February 2018 based on three meteor radars located at Mohe (MH, 53.5°N, 122.3°E), Beijing (BJ, 40.3°N, 116.2°E), and Wuhan (WH, 30.5°N, 116.6°E). The enhanced Q10DWs are observed in the meridional...
Article
Full-text available
We present the climatology of mesopause temperatures using high-and middle-latitude meteor radars. The daily mesopause temperatures are estimated using ambipolar diffusion coefficient data from the meteor radars at Davis Station (68.6°S, 77.9°E), in Antarctica, Svalbard (78.3°N, 16°E), Tromsø (69.6°N, 19.2°E) in the Arctic, and Mohe (53.5°N, 122.3°...
Article
Full-text available
A Fabry–Perot interferometer (FPI) system was deployed to observe the thermospheric winds at Mohe (53.5°N, 122.3°E), the northernmost observatory of space environment in the mainland of China, in July 2019. Thermospheric winds variations revealed from the 1 year FPI observations are as follows: (1) For the diurnal variation, southward meridional wi...
Article
Full-text available
Plain Language Summary The ionospheric sporadic E (Es) layer, which is of high occurrence over mid‐to‐low latitude regions of China, was observed simultaneously or sequentially at locations separated by thousands of kilometers at times. Based on the traditional observational techniques, e.g., ionosonde, it is hard to determine whether the Es layers...
Article
Full-text available
The occurrences of equatorial plasma bubble (EPB) irregularities over Asian and American sectors often show a different behavior due to significantly different geometries of the geomagnetic field. By using the GPS total electron content observations over equatorial and low latitudes sectors of Asian (about 120°E) and American (about 60°W) during 19...
Article
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Sudden stratospheric warming events occur typically over the winter Arctic and are well known for being accompanied by various tides and Rossby waves. A rare SSW occurred in the Southern Hemisphere in September 2019. Here, we combine mesospheric observations from the Northern Hemisphere to study the wave activities before and during the warming eve...
Article
Full-text available
We investigate the ionospheric response to the 21 June 2020 annular solar eclipse using the multiinstrument observations including ionosondes, Global Navigation Satellite System (GNNS) receivers, COSMIC2, and DMSP and SWARM satellites. During the course of the eclipse, total electron content (TEC) decreased slightly in the morning at 20-70°E and la...
Article
Full-text available
Understanding the day‐to‐day variability of equatorial plasma bubble (EPB) irregularities has been a major challenge for many decades that makes the deterministic prediction of EPBs remain elusive. In the present study, we report a case of intense and periodic EPBs observed during 8 and 9 April 2013 by the 47‐MHz Equatorial Atmosphere Radar at Koto...
Article
Full-text available
Plain Language Summary There are various types of ionospheric variations under different triggering conditions. To reveal possible sources responsible for short‐term variability of ionosphere, trace the occurrence and movements of ionospheric irregularities and associated scintillations along the same longitude/latitude, and capture ionospheric dis...
Article
Full-text available
Ionospheric F region bottom‐type irregularity layer has been frequently detected at equatorial latitude and regarded as a possible precursor of equatorial backscatter plumes producing scintillations. In this study, the VHF radar observations of ionospheric F region bottom‐type irregularity layers and plasma plumes over the low‐latitude station Sany...
Article
Full-text available
It is well known that the ionospheric electron densities in the F‐region usually undergo day‐to‐day variability with the magnitude of ~20–35%, associated with the solar as well as geomagnetic activities and the meteorological forcing from the lower atmosphere. In this study, we reported remarkable enhancements in the total electron content (TEC) fr...