GPS phase scintillation at high latitudes during the geomagnetic storm of 17–18 March 2015

Prikryl, P.; Ghoddousi‐Fard, Reza; Weygand, J. M.; Viljanen, A.; Connors, Martin; Danskin, D. W.; Jayachandran, P. T.; Jacobsen, Knut Stanley; Andalsvik, Yngvild Linnea; Thomas, E. G.; Ruohoniemi, J. M.; Durgonics, Tibor; Oksavik, K.; Zhang, Yongliang; Spanswick, E.; Aquino, Márcio; Sreeja, V.

doi:10.1002/2016ja023171

Cited by 58 publications

(53 citation statements)

References 55 publications

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“…We will therefore focus on this time period in the following and elaborate on the intense scintillation scenario of significant and coexisting amplitude and phase scintillations. The scintillation scenarios at other times during this storm are described by Jacobsen and Andalsvik () and Prikryl et al ().…”

Section: Observationmentioning

confidence: 92%

GPS Scintillations and Losses of Signal Lock at High Latitudes During the 2015 St. Patrick's Day Storm

Jin

Oksavik

2018

JGR Space Physics

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We investigate the Global Positioning System (GPS) amplitude and phase scintillations during a severe geomagnetic storm on 17 March 2015. The auroral oval expanded significantly due to a strongly southward interplanetary magnetic field (Bz was −25 nT). When the auroral oval was over Skibotn in northern Norway, significant enhancements in total electron content (TEC) fluctuations, amplitude, and phase scintillation were observed. The strongest amplitude and phase scintillations were observed when a TEC blob propagated across the field of view. Strong amplitude and phase scintillations were observed near the edges of the TEC blob. The European Incoherent SCATter ultrahigh frequency radar observed significant enhancement of electron density (from 0.8 × 1011 to 1.6 × 1011 m−3) near the edge of the TEC blob in the F2 region, while the E region was only slightly enhanced. This indicates that the plasma processes and instability modes, which accounted for the strong GPS scintillations, should involve the F2 region ionosphere. We also analyzed the tracking performance of the GPS receiver during strong ionospheric scintillation condition. While the receiver maintained tracking of the GPS L1 signal, the strong amplitude scintillation resulted in a power fade up to 12 dB‐Hz. Losses of lock occurred in the GPS L2 band. Both the power fade and rapid phase fluctuation should contribute to losses of lock.

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Section: Observationmentioning

confidence: 92%

GPS Scintillations and Losses of Signal Lock at High Latitudes During the 2015 St. Patrick's Day Storm

Jin

Oksavik

2018

JGR Space Physics

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“…The study of these irregularities is vital in understanding the signal observed at the ground; alternatively, the study of the signal as observed from the ground also plays an important role in understanding the formation and morphology of these irregularities. Attempting to relate the signal's features on the ground to the ionospheric phenomena which cause them has proven very useful in understanding the morphology and climatology of the ionosphere, with early works by Gruber () and Jespersen and Kamas (), and more recent works including Cervera and Thomas (), Beniguel et al (), Akala et al (), Paznukhov et al (), Mezaoui et al (), Prikryl et al (), and Prikryl et al () as examples. Several irregularity characteristics can be deduced by studying the rapid variations caused by the irregularities.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Refractive Contribution to GPS Phase “Scintillation”

McCaffrey

Jayachandran

2019

JGR Space Physics

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As L‐band radio waves travel through the ionosphere, such as those transmitted by the Global Positioning System (GPS) satellites, changes in the electron density along the ray path may induce refractive and/or diffractive variations in the signal's phase; where refractive variations are deterministic and diffractive variations are stochastic. Typically, the refractive component of these variations is thought to be slow varying, associated with frequencies less than 0.1 Hz. Therefore, if the refractive contribution is assumed to be associated with frequencies less than 0.1 Hz, the frequencies greater than 0.1 Hz are then assumed and treated as diffractive. These variations are usually referred to as scintillation. In scintillation studies the deterministic refractive variations are very often ignored. We propose that rapid changes in the electron density, and therefore changes in the refractive index along the ray path of the GPS signal, can induce dominantly refractive variations at frequencies greater than 0.1 Hz. The increased drift speeds observed in the high‐latitude region create conditions suitable for these high‐frequency refractive variations; the GPS ray path will sweep through large‐scale irregularities at higher speeds, resulting in high‐frequency refractive variations. Using recent advances in GPS, most importantly an improved signal tracking technique, we present examples of rapid refractive variations in the GPS signal's phase. These high‐frequency variations are shown to be refractive using a combination of techniques, one adapted from a previous technique used for the low‐frequency refractive contributions and a new technique only possible with advances in GPS tracking.

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“…There are a lot of works devoted to this problem (Aarons, 1997;Spogli et al, 2009;Shagimuratov et al, 2015a;Prikryl et al, 2015a;Cherniak and Zakherenkova, 2015;Prikryl et al, 2016). The occurrence of the scintillation at high latitudes is related to the patches in the auroral oval, cusp, and polar-cap.…”

Section: Introductionmentioning

confidence: 99%

Occurrence of TEC fluctuations and GPS positioning errors at different longitudes during auroral disturbances

Шагимуратов¹,

Chernouss²,

Despirak³

et al. 2018

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In this work we analyzed the occurrence of the GPS TEC fluctuations associated with auroral disturbances during the storm on January 7, 2015. The impact of the disturbance on GPS precise positioning were considered. For this purpose, we used the observations of GPS stations located at the European, American and Asian sectors. The auroral activity was determined by data of the IMAGE magnetometers network. The rate of TEC (ROT) used as measure of the TEC fluctuation activity. The intensity fluctuations evaluated by index ROTI. The behavior of fluctuations on different longitudes is very similar. The comparison of substorm activity and the time evolution of the TEC fluctuations showed good consistency. The maximum intensity of TEC fluctuations was observed simultaneously (at the same UT time) over GPS stations which were located at different longitudes. In our work an impact of the geomagnetic disturbances on the Precise Point Positioning (PPP) errors was analyzed. The positioning errors were determined using the GIPSY-OASIS software (APS-NASA). The 3D position errors (P3D) reached the large values (more than 10 m) during storm, while they did not exceed 30 cm during quiet geomagnetic conditions. Our analysis showed the close relation between ROTI and the positioning errors. The positioning errors increased rapidly with increasing of ROTI.

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GPS phase scintillation at high latitudes during the geomagnetic storm of 17–18 March 2015

Cited by 58 publications

References 55 publications

GPS Scintillations and Losses of Signal Lock at High Latitudes During the 2015 St. Patrick's Day Storm

GPS Scintillations and Losses of Signal Lock at High Latitudes During the 2015 St. Patrick's Day Storm

Determination of the Refractive Contribution to GPS Phase “Scintillation”

Occurrence of TEC fluctuations and GPS positioning errors at different longitudes during auroral disturbances

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