Ionospheric F-region observations over American sector during an intense space weather event using multi-instruments

Abreu, A. J. de; Martin, I. M.; Fagundes, P. R.; Venkatesh, K.; Batista, I. S.; Jesús, R. de; Rockenback, M.; Coster, A. J.; Gende, Mauricio; Alves, Mara Lisa; Wild, M.

doi:10.1016/j.jastp.2017.02.009

Cited by 22 publications

(14 citation statements)

References 70 publications

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“…Figures 6, 10, and 13 indicate that the higher occurrence rates of RSFs are well correlated with higher post-sunset h′F peaks (Rungraengwajiake et al 2013). Previous studies observed spread-Fs in the equatorial region on nights when the h′F was below 300 km (Abadi et al 2015;Manju and Madhav Haridas 2015;Liu and Shen, 2017;de Abreu et al 2017). Our results also support this conclusion.…”

Section: The Possible Fof2 Threshold For Fsfs and The Relationship Besupporting

confidence: 86%

“…De Abreu et al (2017) found that the spread-F was often observed during storms using measurements from multiple instruments over the American sector when the foF2 was below 8 MHz. De Abreu et al (2017) showed that the post-sunset EIA is produced by the plasma fountain arising from the pre-reversal vertical drift enhancement in the F-region (as indicated by large sunset increases of h′F and decreases of foF2).…”

Section: The Possible Fof2 Threshold For Fsfs and The Relationship Bementioning

confidence: 99%

“…De Abreu et al (2017) showed that the post-sunset EIA is produced by the plasma fountain arising from the pre-reversal vertical drift enhancement in the F-region (as indicated by large sunset increases of h′F and decreases of foF2). Therefore, it can be seen that the rapidly changing Dst index will also affect spread-Fs; however, our research is not currently focused on ionospheric storms.…”

Section: The Possible Fof2 Threshold For Fsfs and The Relationship Bementioning

confidence: 99%

“…During periods of low solar activity (LSA), the 250 km h′F altitude acted as the h′Fc for the generation of spread-Fs, while the 300 km h′Fc was during periods of high solar activity (HSA). An investigation using measurements from multiple instruments over the American sector showed that spread-Fs were often observed the nights before and during storms near the equator, in which the foF2 was less than 8 MHz and the h′F was lower than 300 km (de Abreu et al 2017). Abadi et al (2015) studied the influences of the h′F on the latitudinal extension of ionospheric irregularities in Southeast Asia.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: The Possible Fof2 Threshold For Fsfs and The Relationship Besupporting

confidence: 86%

Section: The Possible Fof2 Threshold For Fsfs and The Relationship Bementioning

confidence: 99%

Section: The Possible Fof2 Threshold For Fsfs and The Relationship Bementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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show abstract

“…In association with geomagnetic storms, the large-scale irregularities (few km) have shown a seasonal variability [93]. On the other hand, an investigation of the F-region under the impact of the geomagnetic storm occurred on June 2013, from equatorial to middle latitudes in both hemispheres over American sector, showed that the ionospheric irregularities were observed confined in the equatorial region before and during the storm, which shows this storm did not affect the generation or suppression of irregularities [94].…”

Section: Disturbed Geomagnetic Conditionsmentioning

confidence: 99%

GPS Scintillations and Total Electron Content Climatology in the Southern American Sector

Correia¹,

Muella²,

LucillaAlfonsi³

et al. 2019

Accuracy of GNSS Methods

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The radio communication and navigation systems can be strongly affected by the ionospheric conditions, which are controlled by solar phenomena associated with radiation variations and solar wind disturbances. These phenomena can generate ionospheric large-scale plasma redistribution and irregularities with scale sizes varying from centimeters to hundred kilometers. These ionospheric irregularities can produce rapid fluctuations in the amplitude and phase of global navigation satellite system (GNSS) signals, degrading the accuracy of GNSS measurements. Here we give a short review of the ionospheric variations associated with solar phenomena, and the actual state of art in the investigations of long-term (seasonal and solar cycle scales) TEC variations and climatology of scintillations, with focus on the southern American sector. It also presented a new TEC calibration procedure when applied to single-frequency PPP.

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Investigation of global ionospheric response of the severe geomagnetic storm on June 22-23, 2015 by GNSS-based TEC observations

Şentürk

2020

Astrophys Space Sci

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Ionospheric F-region observations over American sector during an intense space weather event using multi-instruments

Cited by 22 publications

References 70 publications

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

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

GPS Scintillations and Total Electron Content Climatology in the Southern American Sector

Investigation of global ionospheric response of the severe geomagnetic storm on June 22-23, 2015 by GNSS-based TEC observations

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