Detection of Daytime Ionospheric Irregularities at Low Latitudes With a Multistatic HF Radar

Wu, Jinnan; Yang, Guobin; Zhang, Yuannong; Zhou, Chen; Zhao, Zhengyu

doi:10.1109/lgrs.2018.2889298

Cited by 6 publications

(4 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Modulation of the Es layers by gravity waves (Woodman et al., 1991), strong neutral wind shear instability (Bernhardt, 2002; Larsen, 2000), and Es‐layer instability (Cosgrove and Tsunoda., 2003) are all associated with the generation of polarization electric fields (Yamamoto et al., 2005), and are proposed as the source for the generation of QP echoes. One of the unresolved issues associated with the E‐region radar backscatter observations at middle and low latitude stations such as Wuhan (13.5 N, 79.2 E, 6.4°N magnetic latitude), Qujing (13.5 N, 79.2 E, 6.4°N magnetic latitude), Sanya (13.5 N, 79.2 E, 6.4°N magnetic latitude) or Gadanki (13.5 N, 79.2 E, 6.4°N magnetic latitude) is the occasionally observed daytime quasi‐periodic echoes (Patra et al., 2009; Wu et al., 2019; Zhou, Liu, et al., 2018; Zhou, Tang, et al., 2018). A polarization electric field, which is required for GDI or Es layering instability excitation, can be produced by this proposed nonlinear KHI process.…”

Section: Discussionmentioning

confidence: 99%

Simulation of Es Layer Modulated by Nonlinear Kelvin–Helmholtz Instability

Zhou

Wang

et al. 2022

JGR Space Physics

Self Cite

View full text Add to dashboard Cite

In this study, a two‐dimensional numerical model of the nonlinear Kelvin–Helmholtz (KH) instability is used to investigate the nonlinear evolution processes of the ion layer, which is associated with the middle and low latitude E region irregularities. Based on simulation results, the two‐stage process in the evolution of the nonlinear KH instability is found in KH vortex morphology. The simulated nonlinear KH instability process presents multiple striation structures, including horizontal structures of the primary ion layer vortex with a size of a few kilometers and the secondary KH vortex with a size of 2 km. The polarization electric field is induced in the horizontal structure of the sporadic E (Es) layer associated with the vortex structure of neutral wind. The polarization electric field presents a similar tendency to the quasi‐periodic vortex structure. The horizontal distorted Es layer structure and anomalously large polarization electric field can provide the initial condition and lead to plasma instability, which can further develop to meter‐scale irregularities of QP echoes.

show abstract

Section: Discussionmentioning

confidence: 99%

Simulation of Es Layer Modulated by Nonlinear Kelvin–Helmholtz Instability

Zhou

Wang

et al. 2022

JGR Space Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…The occurrence of ionospheric scintillation depends on various spatial and temporal factors, including time of day, season, and geographical location [2]. Ionospheric irregularities may be detected by continuously monitoring GNSS signals using ground-based receivers, or by radars, such as the ionosonde or multi-static high-frequency radars [3]- [5].…”

Section: Introductionmentioning

confidence: 99%

“…They generated maps that detected ionospheric irregularities originating from the equator at low and mid-latitude stations. In [5], the authors detected daytime ionospheric irregularities in the E and lower F regions around midday using a multi-static high-frequency radar. This is significant as ionospheric irregularities primarily occur during the post-sunset to midnight period.…”

Section: Introductionmentioning

confidence: 99%

Mapping of S4 Over the Arabian Peninsula During Solar Minimum

Darya

Shaikh

Fernini

et al. 2022

IEEE Geosci. Remote Sensing Lett.

View full text Add to dashboard Cite

In this letter, we study the temporal and spatial variability of ionospheric irregularities by generating high-resolution maps of the observed amplitude scintillation index (S4) using data from a multi-constellation and multi-frequency GNSS receiver. The study region is the Arabian Peninsula, which falls under the northern crest of the equatorial ionization anomaly (EIA). Even though the study was conducted during a solar minimum period, considerable occurrences of pre-sunset scintillation have been observed between 15-17 local time, particularly during the winter solstices. While most scintillation occurrences have been observed at low elevation (15 to 30 degrees), a considerable number of scintillation patches have been observed towards the north, east, and southeast of the receiver location, for elevation angles ranging from 40 to 60 degrees. Our analysis shows that BeiDou geostationary orbit (GEO) and inclined GEO (IGSO) satellites may have been the main contributor to the increased number of scintillation occurrences observed around the eastern side of the receiver as compared to the western side. Out of all the GNSS constellations with MEO satellites, GPS was the most impacted by amplitude scintillation, while BeiDou and Galileo satellites were the least affected. It is anticipated that the patches of ionospheric irregularities reported in this work would be further enhanced as the solar activity increases in the coming years. Therefore, this work can serve as a reference for future studies during periods of increased geomagnetic activity.

show abstract

“…The occurrence of ionospheric scintillation depends on various spatial and temporal factors, including time of day, season, and geographical location [2]. Ionospheric irregularities may be detected either by continuously monitoring GNSS signals using ground-based receivers or by radars, such as the ionosonde or multi-static highfrequency radars [3]- [5].…”

Section: Introductionmentioning

confidence: 99%

Mapping of S4 Over the Arabian Peninsula During Solar Minimum

Darya¹,

Shaikh²,

Fernini³

et al. 2022

Preprint

View full text Add to dashboard Cite

<p>In this letter, we study the temporal and spatial variability of ionospheric irregularities by generating high-resolution maps of the observed amplitude scintillation index (S4) using data from a multi-constellation and multi-frequency GNSS receiver. The study is located in the Arabian Peninsula region, which falls under the northern crest of the equatorial ionization anomaly (EIA). Even though the study was conducted during a solar minimum period, considerable pre-sunset scintillation occurrences have been observed between 15-17 local time, particularly during the winter solstices. While most scintillation occurrences have been observed at low elevation (20 to 25 degrees), a considerable number of scintillation causing ionospheric irregularities have been observed towards the north, east, and southeast of the receiver location, for elevation ranging from 40 to 60 degrees. Out of all the GNSS constellations with medium-earth-orbit (MEO) satellites, GPS was the most impacted by amplitude scintillation, while BeiDou and Galileo satellites were the least affected. It is anticipated that the patches of ionospheric irregularities reported in this work will be further enhanced as solar activity increases in the coming years. Therefore, this work can serve as a reference for future studies during periods of increased geomagnetic activity.</p>

show abstract

Detection of Daytime Ionospheric Irregularities at Low Latitudes With a Multistatic HF Radar

Cited by 6 publications

References 26 publications

Simulation of Es Layer Modulated by Nonlinear Kelvin–Helmholtz Instability

Simulation of Es Layer Modulated by Nonlinear Kelvin–Helmholtz Instability

Mapping of S4 Over the Arabian Peninsula During Solar Minimum

Mapping of S4 Over the Arabian Peninsula During Solar Minimum

Contact Info

Product

Resources

About