Effects observed in the ionospheric F-region in the South American sector during the intense geomagnetic storm of 14 December 2006

Jesús, R. de; Sahai, Y.; Guarnieri, F. L.; Fagundes, P. R.; Abreu, A. J. de; Becker‐Guedes, F.; Brunini, C.; Gende, Mauricio; Cintra, T. M. F.; Souza, Vanessa A. de; Pillat, V. G.; Lima, W. L. C.

doi:10.1016/j.asr.2010.04.031

Cited by 32 publications

(26 citation statements)

References 41 publications

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“…LSTIDs were frequently observed in the Southern Hemisphere through ionosondes and GPS. However, few of them were observed to propagate across the equator and reach Northern Hemisphere de Jesus et al, 2010). In our study, the geomagnetic storm was in its recovery phase on 30 May and 1 June 2011, and there is no notable increase in the AE index.…”

Section: Discussionmentioning

confidence: 72%

“…They are frequently observed through GPS measurements or by ionosondes in middle-and high-latitude regions such as North America (Nicolls et al, 2004;Ding et al, 2007Ding et al, , 2008 and Europe (Borries et al, 2009). They are also commonly observed in middle-and low-latitude regions such as Japan , Brazil (Klausner et al, 2009;de Abreu et al, 2010), and China . Most observations reveal equatorward-propagating LSTIDs.…”

Section: Discussionmentioning

confidence: 99%

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Observations of poleward-propagating large-scale traveling ionospheric disturbances in southern China

et al. 2013

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Abstract. We report here on two cases of poleward-propagating large-scale traveling ionospheric disturbances (LSTIDs) in China during a medium-scale storm between 27 May and 1 June 2011. The observations were conducted by making use of the Global Positioning System network and ionosondes in China and Southeast Asia. One northeastward-propagating LSTID occurred on the morning of 30 May, while the other was observed during the nighttime of 1 June. Both poleward-traveling LSTIDs occurred during the storm's recovery phase in southern China's low-latitude region (geomagnetic latitude ~ 7.3–24° N) and experienced severe dissipation during their propagation from south to north. Although the initial relative amplitude of the nighttime LSTID was ~ 60% larger than that of the morning event, the nighttime event dissipated more quickly than the morning event because of a strong nighttime enhancement in background total electronic content (TEC) during storm time, which led to strong ion-drag dissipation during the evening. The poleward-propagating LSTIDs exhibit a narrower latitudinal range, a smaller amplitude, and a slightly higher elevation compared with the equatorward-moving LSTIDs observed in the same region. Given these features, the poleward-propagating LSTIDs were likely excited by some local source near southern China. Excitation of secondary LSTIDs during the dissipation of some primary medium-scale disturbances from the lower atmosphere is a possible mechanism.

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Section: Discussionmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Observations of poleward-propagating large-scale traveling ionospheric disturbances in southern China

et al. 2013

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“…Extreme solar and space weather events of 13-16 December 2006 have comprehensively studied earlier (Dmitriev et al, , 2010Lei et al, 2008aLei et al, , 2008bEbihara et al, 2009;Myagkova et al, 2009;Pedatella et al, 2009;de Jesus et al, 2010;Kikuchi et al, 2010;Wang et al, 2010;Wei et al, 2011;Dahlgren et al, 2012;Klimenko and Klimenko, 2012) and still attract much attention, particularly in studies of the upper atmosphere and ionosphere (Koshiishi, 2014;Zigman et al, 2014;Kumar et al, 2015). Also, the positive ionospheric storm and FEE enhancement during the main phase and maximum of the 15 December geomagnetic storm were analyzed in our previous works (Suvorova et al, 2012(Suvorova et al, , 2013.…”

Section: Introductionmentioning

confidence: 98%

Long-duration positive ionospheric storm during the December 2006 geomagnetic storm: Ionizing effect of forbidden electrons

Suvorova

Huang

Tsai

et al. 2015

Advances in Space Research

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“…Also, the FSF occurrences observed at different sites exhibited distinct local time distribution patterns. Previous studies have also observed this trend (Zhang et al 2015;de Jesus et al 2010de Jesus et al , 2016 Figure 6 shows variations in the average RSF occurrence rates at the four sites. The RSF occurrence rate was much larger than the FSF occurrence rate at GZ; however, the rates were smaller than the FSF occurrence rates at BJ and CC.…”

Section: Nocturnal Seasonal and Solar Activity Variations On Spreadmentioning

confidence: 55%

“…The disturbed electric fields and the disturbance winds are also the probable factors that promote the spread-F along with the gravity-driven R-T instability. In addition, the electric field disturbances can also generate spread-Fs through R-T instability only (de Jesus et al 2010;Wang et al 2014;Wan and Xu 2014;Mo et al 2017). The disturbance of the dynamo driven by enhanced global thermospheric circulation resulting from energy input at high latitudes is another factor for promoting spreadFs (de Jesus et al 2010;Liu and Shen 2017).…”

Section: Nocturnal Seasonal and Solar Activity Variations On Spreadmentioning

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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Effects observed in the ionospheric F-region in the South American sector during the intense geomagnetic storm of 14 December 2006

Cited by 32 publications

References 41 publications

Observations of poleward-propagating large-scale traveling ionospheric disturbances in southern China

Observations of poleward-propagating large-scale traveling ionospheric disturbances in southern China

Long-duration positive ionospheric storm during the December 2006 geomagnetic storm: Ionizing effect of forbidden electrons

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

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