Yiding Chen

Yiding Chen
Chinese Academy of Sciences | CAS · Institute of Geology and Geophysics

PhD

About

108
Publications
17,571
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1,939
Citations
Citations since 2017
56 Research Items
1235 Citations
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250

Publications

Publications (108)
Article
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Plain Language Summary The stratosphere is a layer of the atmosphere from ∼10–50 km altitudes. Roughly every 2 years, the Northern Hemisphere winter polar stratosphere suddenly warms over a course of few days, and the winds decelerate dramatically, even reversal to easterly winds, which is known as sudden stratospheric warmings (SSW). SSW causes la...
Article
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Due to the limitations on observational data, most storm-enhanced density (SED) studies have focused on the North American sector. The complete picture of the longitudinal evolution of SEDs is still not clear. In this study, we investigated the dynamic evolution of SEDs from the European sector to the North American sector during a geomagnetic stor...
Article
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Ionospheric long‐term variation has attracted wide attention since the upper atmosphere cooling due to increasing greenhouse gas was suggested. Observations of the lower ionosphere have indicated that cooling effect, whereas the F2 layer long‐term variation still remains controversial as multiple driving sources may cause it. It is crucial for inve...
Article
The Martian ionospheric peak is dominated by photochemical processes at dayside. Its primary variations can be well described by the Chapman theory; nevertheless, deviation still exists between observation and the theory. Some factors may be responsible for that deviation, in which the variable upper atmosphere is an important one. Ionospheric radi...
Article
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A single satellite hardly measures the overall ion escape rate from a planet. Therefore, the question concerning the long-term atmospheric evolution of whether a planetary magnetic field protects its atmosphere or aggravates atmospheric loss remains unresolved. Here, combined data from multiple platforms including Cluster, DMSP, IMAGE, and Polar sa...
Article
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Plain Language Summary Previous studies have revealed that the sudden stratospheric warming causes large anomalies in the low‐latitude ionosphere via the vertical ExB plasma drift driven by the E region wind dynamo. However, ionospheric electron density distributions are not only influenced by the vertical ExB drifts, but also by the plasma drifts...
Article
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Based on Mars Atmospheric and Volatile EvolutioN's neutral composition and Langmuir probe electron density and temperature data, we statistically analyzed the climatic variations of the Martian thermosphere and ionosphere and found significant north–south asymmetry. In winter and summer, the asymmetry mainly originates from the north–south asymmetr...
Article
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Based on nearly 4.6 million radio occultation (RO) ionospheric profile data from Constellation Observing System for Meteorology, Ionosphere, and Climate satellites in 2006–2020, a global three‐dimensional ionospheric electron density model was constructed with a new concept. The global 3D ionosphere structure was divided into total 338,661 grids wi...
Article
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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
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The Martian ionosphere was actively detected by Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) aboard the Mars Express. The detected echo signal of the MARSIS at an epoch is presented as a function of frequency and time delay to form an ionogram. Some MARSIS ionograms have been processed to obtain the electron density profiles...
Article
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Geomagnetic activities occur frequently in varying degrees. Strong geomagnetic activities, which have been widely investigated, occur occasionally; they can cause distinguishable and significant disturbances in the ionosphere. Weaker geomagnetic activities appear frequently, whereas their effects are generally difficult to be distinguished from com...
Article
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We use the C/NOFS satellite observations to provide the direct evidence for ultra‐low‐frequency (ULF) fluctuations in the low‐latitude ionospheric electric field during the sudden commencement (SC) on 8 March 2012. The meridional plasma drift shows a sudden downward motion with a large amplitude after SC onset. This initial westward electric field...
Article
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We use the in‐situ observations of DMSP and SWARM satellites to report the changes of the topside ionospheric electron temperature during the October 2016 storm. Electron temperature in the afternoon sector dramatically increases in low latitudes in the recovery phase of the storm. Furthermore, the temperature enhancements have an obvious dependenc...
Article
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Plain Language Summary The phenomenon of mid‐latitude summer nighttime anomalous ionospheric electron density enhancement (MSNA) has often been observed by both ground‐based and space‐based measurements. Previous observation and simulation studies suggested that the combined effects of neutral winds and geomagnetic field configuration are the drive...
Article
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In this study, two ionospheric nighttime enhancement (INE) events at low latitudes are selected to investigate their spatial features through the observations from Global Navigation Satellite System (GNSS) receivers and ionosondes. For the first time, we present the detailed spatial pictures of premidnight and postmidnight INEs under geomagneticall...
Article
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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...
Article
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Martian topography modulated non-migrating tides play important roles in the upper atmosphere and thus in the ionosphere through their coupling, especially in their longitude variations. In this study, the neutral scale height ( H n ) and ionospheric peak electron density ( N m M 2 ) and height ( h m M 2 ) retrieved from the MGS radio occultation m...
Article
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Plain Language Summary The lunar wake, produced by the solar‐wind plasma absorption on the dayside lunar surface, has been expected to be symmetric about the plane of the solar‐wind velocity and the interplanetary magnetic field. The solar‐wind convection electric field, which is perpendicular to that plane, has been found to be able to make asymme...
Article
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Although it is accepted that the electron density double peaks of the Equatorial Ionization Anomaly (EIA) generally merge into a single‐peak with increasing altitude and thus the signature of EIA becomes inconspicuous in the higher topside ionosphere, it is still unclear that to what altitudes the double‐peak structure can extend. In this study, we...
Chapter
Solar radiation provides energy for the formation of the ionosphere from the upper atmosphere called the thermosphere. The basic theory of the ionosphere has been reasonably understood. However, the response of the ionosphere to solar activity, which provides essential information for understanding ionospheric variability and their driving processe...
Article
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Plain Language Summary The solar‐wind interaction of the large‐scale global magnetic fields of the planets in the solar system has been studied extensively, while that of a small‐scale magnetic field is not fully understood mainly because of lack of in situ observations inside the interaction region. Here, two key remotely sensed symptoms, the refl...
Article
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The topside ionosphere accounts for a dominant part of the ionospheric total electron content, whereas accurate global modeling of topside ionospheric electron density (Ne) profile has not been fully achieved. In this study, a high precision Ne profile model, named α‐Chapman Based Electron Density Profile Model (α‐Chapman‐Based‐EDP), was built by u...
Article
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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
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In this study, electron temperature (Te) observations from the Defense Meteorological Satellite Program F17 and F18 spacecraft during 2010–2017 are analyzed to explore the longitudinal differences of Te in the topside ionosphere on both sides of zero geomagnetic declination lines in the northern mid‐latitude under geomagnetically weak activities (K...
Article
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Daytime bite‐out in diurnal variations of the F2‐layer electron density often occurs in the equatorial ionosphere, while it was less reported at mid‐latitudes. In this paper, the climatology of daytime bite‐out was investigated using ionosonde measurements in the East Asia sector. The bite‐out can take place at both low‐ and mid‐latitudes and mainl...
Article
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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
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The daytime average zonal electric field is well known to be eastward in the equatorial ionosphere. Geomagnetic observations have revealed that the equatorial electrojet or zonal electric field occasionally becomes westward in the afternoon sector during quiet times. We present the first analysis of the dependence of the afternoon downward plasma d...
Article
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An annual solar eclipse occurred on 21 June 2020. The maximum eclipse path of this solar eclipse covers the geomagnetic latitude 10-20°N in East Asia. The geomagnetic conjugate region of the eclipse region covers most of the land in Australia. It provides a valuable opportunity to study the ionospheric responses not only in the solar eclipse region...
Article
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Noontime bite‐out (depletion) of NmF2 (peak electron density of the F2 layer) often occurs in the equatorial ionosphere; it is characterized by a noontime minimum sandwiched by a prenoon peak and a postnoon peak of NmF2. The fountain effect was suggested to be responsible for this abnormal diurnal variation pattern. Noontime bite‐out should occur n...
Article
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The ionospheric electron density generally decreases after sunset under the effect of recombination, but sometimes, it increases, which forms an ionospheric nighttime enhancement (INE). In this research, the observations from two ionosondes in Mohe and Beijing and NASA's Jet Propulsion Laboratory‐Global Ionosphere Maps during the 24th solar cycle w...
Article
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The day‐to‐day variability of the ionospheric electron density and its longitudinal gradient challenges our description and understanding of the ionosphere, which is also essential for reliable applications of the Global Navigation Satellite System (GNSS). In this paper we conduct a case study of the anomalous enhancements in ionospheric electron d...
Article
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The field‐aligned plasma drift in the equatorial ionosphere drives the interhemispheric transport of the ionospheric F region plasma between the Northern and Southern Hemispheres. We use the Communication/Navigation Outage Forecasting System satellite measurements, for the first time, to present the responses of the equatorial field‐aligned drift d...
Article
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Previous studies have shown that the ionospheric responses to a solar flare are significantly dependent on the solar zenith angle (SZA): the ionospheric responses are negatively related to the SZAs. The largest enhancement in electron density always occurs around the subsolar point. However, from 2001 to 2014, the global distribution of total elect...
Article
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The geomagnetic storm‐driven ionospheric changes and the involved processes are interesting and challenging topics in understanding and predicting the ionosphere. In this study we investigate the response of the ionosphere to geomagnetic disturbances during the 30‐day incoherent scatter radar measurements conducted at Millstone Hill (42.6°N, 71.5°W...
Article
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On 6 December 2015, the Magnetospheric Multiscale satellites traversed the southward outflow of a magnetic reconnection on the magnetopause from the outside in. The magnetic structures or the geometries of the field lines inside this outflow are distinguished in detail by using the plasma and magnetic field observations. A flux rope and the magneti...
Data
Code S1 is a compressed folder of MATLAB code implementing the empirical model (2PCAFourier-Hm) of Hm. This code can give global Hm (as form of mat or figure) covering the height within 200 km above peak height of F2 layer (hmF2) at any latitude (70°N-70°S), local time, longitude, day of year within F10.7 in the intervals of 75-120 sfu. Please note...
Data
Figure S1 shows the local time variation of the zonal difference of Hm during F10.7<90 and F10.7≥90 sfu. Figure S2 provides the local time versus longitude variation of Chapman-α scale height (Hm) at different seasons during F10.7≥90 sfu. The Hm shows a zonal wave-2 structrue during 8-24 LT in local winter at northern mid latitudes during F10.7≥90...
Article
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Scale height measures the altitude gradient of the electron density profile and relates with the ionospheric chemistry and dynamics, while its longitudinal variation has not been fully investigated in both statistical analyses and empirical modelings. In this study, eleven‐year electron density profiles from Constellation Observing System for Meteo...
Article
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We use the observations from the incoherent scatter radar and the magnetometers over Jicamarca (11.95° S, 76.87° W) sector to investigate the equatorial ionospheric electrodynamics on 6–11 September 2017. In this period, there are three X-class solar flares peaked at 12:02, 14:36, and 16:06 UT on 6, 7, and 10 September, respectively, in the local d...
Article
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Earlier incoherent scatter radar measurements revealed upward topside ion fluxes in the summer and downward fluxes in the winter at mid-latitudes at night; a summer to winter interhemispheric coupling was accordingly inferred. However, this interhemispheric coupling through the plasmasphere is difficult to confirm directly from observations. A poss...
Data
Supporting information of the paper (Longitudinal structure of the mid‐latitude ionosphere using COSMIC electron density profiles).
Data
A gif figure to show the longitudinal variation of mid-latitude ionosphere as the function of geographical longitude versus altitude at different local times
Article
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Longitudinal variations of electron density (Ne) near zero-magnetic declination lines at mid-latitude ionosphere have been disclosed earlier in some longitude regions. However, its global picture remains unclear. In this study, Ne at mid-latitudes (40°-50° mag. lat.) within 170-550 km altitudes obtained from Constellation Observing System for Meteo...
Article
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Using C/NOFS satellite observations, this paper studies the disturbance field-aligned plasma drifts in the equatorial topside ionosphere during eight geomagnetic storms in 2011-2015. During all six storms occurred in the solstices, the disturbance field-aligned plasma drift is from winter to summer hemisphere especially in the morning-midnight loca...
Article
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Solar rotation (SR) variation dominates solar extremely ultraviolet (EUV) changes on the timescale of days. The F10.7 index is usually used as an indicator for solar EUV. The SR variation of F10.7 significantly enhanced during the 2008th–2009th Carrington rotations (CRs) owing to an intense active region; F10.7 increased about 180 units during that...
Article
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In this paper, we use the C/NOFS and ROCSAT-1 satellites observations to analyze the storm time evolution of the disturbance plasma drifts in a 24 h local time scale during three magnetic storms driven by long-lasting southward IMF Bz. The disturbance plasma drifts during the three storms present some common features in the periods dominated by the...
Article
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Previous investigations on ionospheric responses to solar flares focused mainly on the photoionization caused by the increased X-rays and extreme ultra-violet irradiance. However, little attention was paid to the related electrodynamics. In this letter, we explored the equatorial electric field (EEF) and electrojet (EEJ) in the ionosphere at Jicama...
Article
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Interhemispheric asymmetry of the topside ionosphere around March equinox of a solar maximum year 2000 was investigated using ROCSAT-1 total ion density (Ni) measurements. The asymmetry during the local time sector of late afternoon to midnight was analyzed for two longitude sectors with larger geomagnetic declinations (positive at 120°W ~ 180°W an...
Article
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The July 2012 geomagnetic storm is an extreme space weather event in solar cycle 24, which is characterized by a southward interplanetary geomagnetic field lasting for about 30 h below -10 nT. In this work, multiple instrumental observations including electron density from ionosondes, total electron content (TEC) from Global Positioning System (GPS...
Article
In this work, we report the estimation of mesospheric temperatures at 90 km height from the observations of the VHF all-sky meteor radar operated at Mohe (53.5 °N, 122.3° E), China, since August 2011. The kinetic temperature profiles retrieved from the observations of Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) onboard th...
Article
Detecting the changing of the upper atmosphere is an important and challenging issue. The change in the meteor peak heights observed by a meteor radar should contain information of the neutral density in the meteoroid ablation region. In this work, observations from the VHF all-sky meteor radars operated at Beijing (40.3 °N, 116.2° E) and Mohe (53....
Article
We collected total electron content (TEC) data in the longitudinal sector of 60° W – 90° W during 1999-2015to investigate the latitudinal variation of nighttime middle and high latitude ionosphere. The mid-latitude trough is one of the important features of the nighttime ionosphere. The statistical analysis provides unprecedented detail of the loca...
Article
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Strongly conducting or magnetized obstacles in a flowing plasma generate structures called Alfvén wings, which mediate momentum transfer between the obstacle and the plasma. Nonconducting obstacles such as airless planetary bodies can generate such structures, which, however, have so far been seen only in sub-Alfvénic regime. A novel statistical an...