GPS scintillation and TEC depletion near the northern crest of equatorial anomaly over South China

Deng, Baichang; Huang, Jian; Liu, Weifeng; Xu, Jisheng; Huang, Lingfeng

doi:10.1016/j.asr.2012.09.008

Cited by 29 publications

(23 citation statements)

References 37 publications

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“…The results are similar to those observed around the equatorial ionization anomaly. By analyzing the GPS L-band scintillation data obtained at Guangzhou and Shenzhen from July 2008 to March 2012, Deng et al (2013) found that scintillation occurred only in the pre-midnight period at equinox during low solar activity years. In the case of the QF index, Fig.…”

Section: Resultsmentioning

confidence: 99%

A comparative study of GPS ionospheric scintillations and ionogram spread F over Sanya

Zhang

Wan

et al. 2015

Ann. Geophys.

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Abstract. We analyze the data recorded during December 2011-November 2012 by a digital ionosonde and a GPS (Global Positioning System) scintillation and (total electron content) TEC receiver collocated at Sanya (109.6 • E, 18.3 • N; dip lat. 12.8 • N), a low-latitude station in the Chinese longitude sector, to carry out a comparative study of ionospheric scintillations and spread F. A good consistency between the temporal variations of GPS scintillation (represented by the S4 index) and of ionogram spread F (represented by the QF index) is found in the pre-midnight period during equinox. However in the post-midnight period during equinox and in the period from post-sunset to presunrise during June solstice, moderate spread F is seen without concurrent GPS scintillation. The possible cause responsible for the difference between post-midnight GPS scintillation and spread F during equinox could be due to the decaying of 400 m scale irregularities associated with equatorial spread F. Regarding the irregularities producing moderate QF and low S4 indices during June solstice, we suggest that the frequently observed sporadic E (Es) layer and the medium-scale traveling ionospheric disturbances (MSTIDs) over Sanya could play important roles in triggering the June solstitial spread-F events.

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Section: Resultsmentioning

confidence: 99%

A comparative study of GPS ionospheric scintillations and ionogram spread F over Sanya

Zhang

Wan

et al. 2015

Ann. Geophys.

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“…Most low-latitude ionospheric scintillations and irregularities are observed in the pre-midnight period and have been statistically studied using ground-based and in situ satellite measurements (Singh et al, 2006;Su et al, 2006;Basu et al, 2009). The formation and evolution of ionospheric irregularities are believed to be the primary sources for the scintillations (Basu et al, 1978;Su et al, 2006;Deng et al, 2013;etc.). After sunset, a rapid increase in the zonal (eastward) electric field in the equatorial ionosphere, which causes an uplift of the ionospheric plasma (i.e., PRE), and the presence of a steep density gradient on the bottom side of the equatorial F region are prerequisites for creating conditions favourable to the formation of plasma instability mechanisms that trigger the generation of irregularities (Muella et al, 2014).…”

Section: Diurnal and Seasonal Variations Of Scintillationsmentioning

confidence: 98%

“…However, the ionospheric observation network is unevenly distributed across Sanya, Hainan, Guilin, Guangzhou, Shenzhen, Wuhan, etc. Previous researchers Xu et al, 2007;Li et al, 2008;Shang et al, 2008;Zou and Wang, 2009;Zou, 2011;Deng et al, 2013;etc. ) have studied the morphology of GPS ionospheric scintillations in the low latitude regions of China.…”

Section: Introductionmentioning

confidence: 97%

“…Li et al (2007) used the scintillation data recorded at Sanya (18.33°N, 109.52°E) from July 2004-July 2005 to obtain the spectral characteristics of irregularities producing ionospheric scintillations and to estimate the correlation between amplitude scintillation and power spectral density. Deng et al (2013) statistically analysed the variations of the scintillation with the local time, season, solar activity and duration of scintillation patches using the observation data collected at Guangzhou (23. 16°N,113.34°E) and Shenzhen (22.59°N,113.97°E) from July 2008 to March 2012.…”

Section: Introductionmentioning

confidence: 99%

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A study of GPS ionospheric scintillations observed at Shenzhen

Linfeng

Wang

Jiang

et al. 2014

Advances in Space Research

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“…Many ground-based instruments (optical, ionosondes, and radar) and space-borne platforms (rockets and satellites) have been employed to explore the spread-F phenomenon over the past seven decades. These efforts have deepened our knowledge on spread-Fs showing that they vary with respect to latitude, local time, season, and solar and magnetic activity (Alfonsi et al 2013;Banola et al 2005;Chou and Kuo 1996;Deng et al 2013;Huang et al 1993;Scherliess and Fejer 1999). Different mechanisms have been proposed to explain spread-F occurrences and their development (Bowman 1990;Fejer et al 1999;Fukao et al 2004); among these, the primary mechanism in equatorial regions is the generalized Rayleigh-Taylor (R-T) instability mechanism.…”

Section: Introductionmentioning

confidence: 99%

Spread-F occurrences and relationships with foF2 and h′F at low- and mid-latitudes in China

Wang

Guo

Zhao

et al. 2018

Earth Planets Space

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Ionospheric irregularities are an important phenomenon in scientific studies and applications of radio-wave propagation. Spread-F echoes in ionograms are a type of high-frequency band irregularities that include frequency spread-F (FSF), range spread-F (RSF), and mixed spread-F (MSF) events. In this study, we obtained spread-F data from four ionosondes at low-and mid-latitudes near the 120°E chain in China during the 23rd solar cycle. We used these data to investigate spread-F occurrence percentages and variations with local time, season, latitude, and solar activity. The four ionosondes were located at Haikou (HK) (20°N, 110.34°E), Guangzhou (GZ) (23.14°N, 113.36°E), Beijing (BJ) (40.11°N, 116.28°E), and Changchun (CC) (43.84°N, 125.28°E). We also present possible correlations between spread-Fs and other ionospheric parameters, such as the critical frequency of the F2-layer (foF2) and the virtual height of the bottom-side F-layer (h′F). In particular, we investigated the possible threshold of the foF2 affecting the FSF and the relationship between the h′F and the RSF. The main conclusions are as follows: (a) the FSF occurrence percentages were anti-correlated with solar activity at all four sites; meanwhile, RSF occurrence rates increased with the increase in solar activity at HK, but not at the other three sites; (b) FSF occurrence rates were larger at the mid-latitudes than expected, while FSFs occurred more often after midnight; (c) the highest FSF occurrence rates mostly appeared during the summer months, while RSFs occurred mostly in the equinoctial months of 2000-2002 at HK and GZ; (d) a lower foF2 was suitable for FSF events; nevertheless, h′F and RSF occurrences satisfied the parabolic relationship; (e) the foF2 thresholds for FSFs were 15, 14, 7.6, and 7.8 MHz at HK, GZ, BJ, and CC, respectively. The h′Fs occurring between 240 and 290 km were more favorable for RSF occurrences. These results are important for understanding ionospheric irregularity variations in eastern Asia and for improving space weather modeling and forecasting capabilities .

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GPS scintillation and TEC depletion near the northern crest of equatorial anomaly over South China

Cited by 29 publications

References 37 publications

A comparative study of GPS ionospheric scintillations and ionogram spread F over Sanya

A comparative study of GPS ionospheric scintillations and ionogram spread F over Sanya

A study of GPS ionospheric scintillations observed at Shenzhen

Spread-F occurrences and relationships with foF2 and h′F at low- and mid-latitudes in China

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