A statistical analysis of sporadic <i>E</i> layer occurrence in the midlatitude China region

Zhou, Chen; Tang, Qiong; Song, Xiaoxiao; Qing, Haiyin; Liu, Yi; Wang, Xiang; Gu, Xudong; Ni, Binbin; Zhao, Zhengyu

doi:10.1002/2016ja023135

Cited by 44 publications

(50 citation statements)

References 72 publications

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“…The formation of midlatitude E s is generally attributed to the wind shear modulation on the meteor‐originated metallic ions through collisional and electromagnetic processes (Haldoupis, , ; Haldoupis et al, ). Several studies revealed that the occurrence of E s at midlatitude region manifests a pronounced local time (LT) and seasonal dependence and is statistical considerable during summer daytime and postsunset period (Earle et al, ; Xue et al, ; Zhou et al, ).…”

Section: Introductionmentioning

confidence: 99%

The Simultaneous Observations of Nighttime Ionospheric E Region Irregularities and F Region Medium‐Scale Traveling Ionospheric Disturbances in Midlatitude China

et al. 2018

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Coupling of ionospheric E and F regions in the midlatitude region has been studied for a couple of years. In this study, we investigate the nighttime disturbances in E and F regions in midlatitude China region by using Wuhan ionosonde, Wuhan very high frequency coherent scatter radar, and Mengcheng airglow imager. We present two case studies of simultaneous observations of diffuse sporadic E (Es) layers, quasiperiodic echoes of E region irregularities, spread F, and medium-scale traveling ionospheric disturbances. Results of case studies indicate that diffuse Es layers and E region irregularities can be associated with the F region medium-scale traveling ionospheric disturbances or spread F through polarization electric field mapping along the field lines. We then analyze the data set of Wuhan ionosonde and Wuhan very high frequency radar during 2015-2016 and find that the coincidence of diffuse Es layers, quasiperiodic echoes of E region irregularities, and spread F is high at local nighttime. Our results provide the first observational evidence in midlatitude China region to support the concept that polarization electric field generated in the E region irregularities could map along the magnetic field lines and excite electrodynamic disturbances in F region, such as Perkins instability.

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Section: Introductionmentioning

confidence: 99%

The Simultaneous Observations of Nighttime Ionospheric E Region Irregularities and F Region Medium‐Scale Traveling Ionospheric Disturbances in Midlatitude China

et al. 2018

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“…As per the analysis, during the magnetic storms, the presence of Es layer at low-latitude station at Hyderabad could be influencing (diminishing) the spread-F occurrence at the equatorial station at Tirunelveli due to changes in E-region integrated Pederson conductivity. Recently, Zhou et al (2017) suggested that occurrence of midlatitude Es layers is also influenced by geomagnetic storms. Stephan et al (2002) modeled that the growth rate of R-T instability decreases in the presence of Es layers.…”

Section: Discussionmentioning

confidence: 99%

“…So the results presented in 10.1029/2019JA027212 Journal of Geophysical Research: Space Physics our paper also suggest that PRE could have been affected by E-region processes. Recently, Zhou et al (2017) suggested that occurrence of midlatitude Es layers is also influenced by geomagnetic storms. They surmised that storm-induced equatorward winds could modify the local winds and wind shears that can affect the Es layers.…”

Section: Discussionmentioning

confidence: 99%

A Statistical Study on The Local Time Dependence of Equatorial Spread F (ESF) Irregularities and Their Relation to Low‐Latitude Es Layers Under Geomagnetic Storms

Singh

Sripathi

2020

JGR Space Physics

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In this paper, we present a study on the local time dependence of equatorial spread F (ESF) irregularities and their relation to low-latitude Es layers in response to geomagnetic storms using simultaneous observations of two ionosondes one located at Tirunelveli (8.73°N, 77.70°E), an equatorial station and other located at Hyderabad (17.36°N, 78.47°E), an off-equatorial station during the years 2007-2015 that covers solar cycles 23 and 24. The Aarons criteria for the ESF irregularities for different seasons under geomagnetic storms are evaluated. In the category I, we noticed partial enhancement in prereversal enhancement (PRE) during postsunset resulting in~30% occurrence of spread F instead of total inhibition during equinox and winter seasons. Also, occurrence of ESF in summer is suppressed by onlỹ 75% due to partial increase in PRE. In category II, we observed presunrise height enhancement mostly during winter, which caused ESF to occur at~50% followed by equinox and summer. The results presented here suggest that many are actually not following the Aarons criteria possibly due to not considering other background conditions. Accordingly, we examined the plausible role of low-latitude Es layers on the generation of ESF irregularities under these categories during geomagnetic storms. We noticed the absence/presence of Es layers in both categories during postsunset and postmidnight hours resulting in increase/decrease of PRE due to modifications in the field-line-integrated Pederson conductivity. Accordingly, the results suggest that one of the plausible reasons for ESF irregularities not following Aarons criteria is linked to the variability of the low-latitude Es layers. Plain Language SummaryThe electric fields and winds in the equatorial and low-latitude ionosphere are modified during geomagnetic storms due to coupling of solar wind-magnetosphereionosphere in the high latitudes. Accordingly, the occurrence of equatorial spread F (ESF) irregularities are significantly affected by the geomagnetic storms depending upon the time of the onset of the geomagnetic storm. We classified our observations into three categories based on Aarons criteria under different seasons to examine the role of geomagnetic storms on the generation/suppression of ESF irregularities based on the onset conditions of magnetic storms over India. The observations suggest that many ESF events could not follow this criterion due to not having included other background conditions. Accordingly, we examined the role of low-latitude Es layers, which may affect the field-integrated conductivities of the E and F regions during the onset times of ESF irregularities using larger data. The results suggest that whenever Es layers are present (absent) at low latitude, suppression (generation) of premidnight or postmidnight ESF irregularities at Tirunelveli is on rise. So these results suggest that if the low-latitude Es layers are taken into account, occurrence of ESF irregularities may be explained better by the above criteria.

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“…A statistical analysis of sporadic E layer occurrences was conducted by Zhou C et al (2017b). They collected 5‐year ionosonde data from four stations in the midlatitude China region.…”

Section: Ionospheric Irregularity and Scintillationmentioning

confidence: 99%

Chinese ionospheric investigations in 2016–2017

Liu

Wan

2018

Earth and Planetary Physics

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After the release of the previous report to the Committee on Space Research (COSPAR) on progress achieved by Chinese scientists in ionospheric researches (Liu LB and Wan WX, 2016), in the recent two years (2016–2017) many interesting new investigations into various ionospheric related issues have been completed. In this report, about 100 publications are summarized. The topics highlighted are as follows: Ionospheric space weather, ionospheric dynamics, ionospheric climatology and modelling, ionospheric irregularity and scintillation, Global Navigation Satellite System (GNSS) related ionospheric issues and other techniques, and radio wave propagation in the ionosphere. An outstanding feature is that more and more observations from the Meridional Project supported the ionospheric investigations.

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A statistical analysis of sporadic E layer occurrence in the midlatitude China region

Cited by 44 publications

References 72 publications

The Simultaneous Observations of Nighttime Ionospheric E Region Irregularities and F Region Medium‐Scale Traveling Ionospheric Disturbances in Midlatitude China

The Simultaneous Observations of Nighttime Ionospheric E Region Irregularities and F Region Medium‐Scale Traveling Ionospheric Disturbances in Midlatitude China

A Statistical Study on The Local Time Dependence of Equatorial Spread F (ESF) Irregularities and Their Relation to Low‐Latitude Es Layers Under Geomagnetic Storms

Chinese ionospheric investigations in 2016–2017

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