Middle‐ and low‐latitude ionosphere response to 2015 St. Patrick's Day geomagnetic storm

Nava, B.; Rodríguez‐Zuluaga, J.; Alazo-Cuartas, K.; Kashcheyev, A.; Migoya-Orué, Yenca; Radicella, S. M.; Amory‐Mazaudier, Christine; Fleury, Rolland

doi:10.1002/2015ja022299

Cited by 201 publications

(255 citation statements)

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“…The crest disappearance at earlier time in Swarm data is also in correspondence to the substorm signature at about 13 UT, related to 19/21 LT depending on the longitudinal sector. This is the result of the F layer shrinking, already reported by Figure 11 of Nava et al [2016]. This is the result of the F layer shrinking, already reported by Figure 11 of Nava et al [2016].…”

Section: Resultssupporting

confidence: 67%

“…The green vertical short lines at the bottom of each plot mean that the ionogram is recorded but the trace is too poor to validate a reliable value of h 0 F. The same gray curve in each of the plots represents the h 0 F values measured at Sanya on 15 March 2015 and here considered as the quiet reference day (analogously toNava et al [2016]). The green vertical short lines at the bottom of each plot mean that the ionogram is recorded but the trace is too poor to validate a reliable value of h 0 F. The same gray curve in each of the plots represents the h 0 F values measured at Sanya on 15 March 2015 and here considered as the quiet reference day (analogously toNava et al [2016]).…”

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confidence: 99%

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Formation of ionospheric irregularities over Southeast Asia during the 2015 St. Patrick's Day storm

et al. 2016

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We investigate the geospace response to the 2015 St. Patrick's Day storm leveraging on instruments spread over Southeast Asia (SEA), covering a wide longitudinal sector of the low‐latitude ionosphere. A regional characterization of the storm is provided, identifying the peculiarities of ionospheric irregularity formation. The novelties of this work are the characterization in a broad longitudinal range and the methodology relying on the integration of data acquired by Global Navigation Satellite System (GNSS) receivers, magnetometers, ionosondes, and Swarm satellites. This work is a legacy of the project EquatoRial Ionosphere Characterization in Asia (ERICA). ERICA aimed to capture the features of both crests of the equatorial ionospheric anomaly (EIA) and trough (EIT) by means of a dedicated measurement campaign. The campaign lasted from March to October 2015 and was able to observe the ionospheric variability causing effects on radio systems, GNSS in particular. The multiinstrumental and multiparametric observations of the region enabled an in‐depth investigation of the response to the largest geomagnetic storm of the current solar cycle in a region scarcely reported in literature. Our work discusses the comparison between northern and southern crests of the EIA in the SEA region. The observations recorded positive and negative ionospheric storms, spread F conditions, scintillation enhancement and inhibition, and total electron content variability. The ancillary information on the local magnetic field highlights the variety of ionospheric perturbations during the different storm phases. The combined use of ionospheric bottomside, topside, and integrated information points out how the storm affects the F layer altitude and the consequent enhancement/suppression of scintillations.

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Section: Resultssupporting

confidence: 67%

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confidence: 99%

Formation of ionospheric irregularities over Southeast Asia during the 2015 St. Patrick's Day storm

et al. 2016

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“…In order to look for such LTEs in a similar geomagnetic storm category, the author turn to the G4 geomagnetic storm that 25 happened during the St. Patrick's day of 2015, which has been thoroughly studied (Astafyeva et al, 2015;Cherniak et al, 2015;Nava et al, 2016;Yao et al, 2016;Jin et al, 2017;Zhang et al, 2018). This storm was also product of a CME an it was reported that the storm sudden commencement was at ∼04:45 UT on March 17, 2015 (Yao et al, 2016).…”

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confidence: 99%

Emergence of a localized total electron content enhancement during the G4 geomagnetic storm of September 8, 2017

Sotomayor-Beltran¹

2018

Preprint

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Abstract. In this work, the first results of the analysis on total electron content (TEC) data before, during and after the geomagnetic storm of September 8, 2017 are reported. A common response to geomagnetic storms due to the southern vertical interplanetary magnetic field (Bz) is the enhancement of the electron density in the ionosphere. Vertical TEC (VTEC) from the Center for Orbit determination in Europe (CODE) along with a statistical method were used to identify positive and/or negative ionospheric storms in response to the geomagnetic storm of September 8, 2017. When analysing the response to the G4 storm of September 8, 2017 it was indeed possible to observed an enhancement of the equatorial ionization anomaly (EIA); however what it is was unexpected, was the identification of a local TEC enhancement (LTE) to the south of the EIA (~ 40° S), right over New Zealand and extending towards the south-eastern coast of Australia and also eastward towards the Pacific). This was a very transitory LTE that lasted approximately 2 hours, starting at ~ 02:00 UT on September 8 where its maximum VTEC increase was of 241,2 %. Using the same statistical method we looked for LTEs in a similar category geomagnetic storm, the G4 storm of St. Patrick's day of 2015; however for this storm, no LTEs were identified. As also indicated in a past recent study for the August 15, 2015 geomagnetic storm, an association between the LTE and the excursion of Bz observed during the September 8, 2017 storm is observed. Nevertheless, it is more likely that a direct impact of the super-fountain effect along with another ionospheric physical mechanism may be playing an important role in the production of this LTE.

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“…Previous studies have reported the fact, validated by a number of observations, that a significant source of ionospheric disturbances and different storm-time phenomenon (e.g. TID propagation) is Joule heating at high latitudes (de Abreu et al, 2010;Nava et al, 2016;Yao et al, 2017). Due to the impact of magnetic storms of 17 March 2015, the ionosphere appeared characteristics of peaks and troughs.…”

Section: Resultsmentioning

confidence: 86%

“…They found storm-induced LSTIDs which were propagating towards the Equator and had large wave parameters. Nava et al (2016) Figure 1. Location of GPS receiver stations.…”

Section: Introductionmentioning

confidence: 99%

Study of ionospheric disturbances over the China mid- and low-latitude region with GPS observations

Ning

Tanida

2018

Ann. Geophys.

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Abstract. Ionospheric disturbances constitute the main restriction factor for precise positioning techniques based on global positioning system (GPS) measurements. Simultaneously, GPS observations are widely used to determine ionospheric disturbances with total electron content (TEC). In this paper, we present an analysis of ionospheric disturbances over China mid-and low-latitude area before and during the magnetic storm on 17 March 2015. The work analyses the variation of magnetic indices, the amplitude of ionospheric irregularities observed with four arrays of GPS stations and the influence of geomagnetic storm on GPS positioning. The results show that significant ionospheric TEC disturbances occurred between 10:30 and 12:00 UT during the main phase of the large storm, and the static position reliability for this period are little affected by these disturbances. It is observed that the positive and negative disturbances propagate southward along the meridian from mid-latitude to low-latitude regions. The propagation velocity is from about 200 to 700 m s −1 and the amplitude of ionospheric disturbances is from about 0.2 to 0.9 TECU min −1 . Moreover, the position dilution of precession (PDOP) with static precise point positioning (PPP) on storm and quiet days is 1.8 and 0.9 cm, respectively. This study is based on the analysis of ionospheric variability with differential rate of vertical TEC (DROVT) and impact of ionospheric storm on positioning with technique of GPS PPP.

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Middle‐ and low‐latitude ionosphere response to 2015 St. Patrick's Day geomagnetic storm

Cited by 201 publications

References 50 publications

Formation of ionospheric irregularities over Southeast Asia during the 2015 St. Patrick's Day storm

Formation of ionospheric irregularities over Southeast Asia during the 2015 St. Patrick's Day storm

Emergence of a localized total electron content enhancement during the G4 geomagnetic storm of September 8, 2017

Study of ionospheric disturbances over the China mid- and low-latitude region with GPS observations

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