Statistics of ionospheric disturbances and their correlation with GNSS positioning errors at high latitudes

Jacobsen, Knut Stanley; Dähnn, Michael

doi:10.1051/swsc/2014024

Cited by 77 publications

(62 citation statements)

References 17 publications

(16 reference statements)

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“…The scintillations over Europe in period 2012 were presented in the work of Jacobsen and Dähnn (2014) and the same for the storm of 17 March 2015 was presented by Jacobsen and Andalsvik (2016).…”

Section: Introductionmentioning

confidence: 83%

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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Section: Introductionmentioning

confidence: 83%

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

Шагимуратов¹,

Chernouss²,

Despirak³

et al. 2018

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“…For typical scintillation strength in various regions of the high-latitude ionosphere including cusp, auroral oval and polar cap, we refer the reader to case studies (e.g., Jin et al, 2014;Prikryl et al, 2015a, b, c). It should be noted that proxy scintillation indices such as the rate of TEC index (ROTI) (Jacobsen and Dähnn, 2014) and disturbance ionosphere index (DIX) (Jakowski et al, 2012) could be used instead of σ to map scintillation with comparable results. Also, GPS climatology of scintillation and TEC in the Southern Hemisphere and interhemispheric comparison is of interest for future studies.…”

Section: Phase Scintillation Climatologymentioning

confidence: 99%

Climatology of GPS phase scintillation at northern high latitudes for the period from 2008 to 2013

et al. 2015

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Abstract. Global positioning system scintillation and total electron content (TEC) data have been collected by ten specialized GPS Ionospheric Scintillation and TEC Monitors (GISTMs) of the Canadian High Arctic Ionospheric Network (CHAIN). The phase scintillation index σ is obtained from the phase of the L1 signal sampled at 50 Hz. Maps of phase scintillation occurrence as a function of the altitude-adjusted corrected geomagnetic (AACGM) latitude and magnetic local time (MLT) are computed for the period from 2008 to 2013. Enhanced phase scintillation is collocated with regions that are known as ionospheric signatures of the coupling between the solar wind and magnetosphere. The phase scintillation mainly occurs on the dayside in the cusp where ionospheric irregularities convect at high speed, in the nightside auroral oval where energetic particle precipitation causes field-aligned irregularities with steep electron density gradients and in the polar cap where electron density patches that are formed from a tongue of ionization. Dependences of scintillation occurrence on season, solar and geomagnetic activity, and the interplanetary magnetic field (IMF) orientation are investigated. The auroral phase scintillation shows semiannual variation with equinoctial maxima known to be associated with auroras, while in the cusp and polar cap the scintillation occurrence is highest in the autumn and winter months and lowest in summer. With rising solar and geomagnetic activity from the solar minimum to solar maximum, yearly maps of mean phase scintillation occurrence show gradual increase and expansion of enhanced scintillation regions both poleward and equatorward from the statistical auroral oval. The dependence of scintillation occurrence on the IMF orientation is dominated by increased scintillation in the cusp, expanded auroral oval and at subauroral latitudes for strongly southward IMF. In the polar cap, the IMF B Y polarity controls dawn-dusk asymmetries in scintillation occurrence collocated with a tongue of ionization for southward IMF and with sun-aligned arcs for northward IMF. In investigating the shape of scintillation-causing irregularities, the distributions of scintillation occurrence as a function of "off-meridian" and "off-shell" angles that are computed for the receiver-satellite ray at the ionospheric pierce point are found to suggest predominantly field-aligned irregularities in the auroral oval and L-shell-aligned irregularities in the cusp.

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“…Comprehensive information on the topic of patches may be found in Carlson (2012). Several studies have shown that the distribution of scintillations at high latitudes is similar to the region of patch formation on the dayside and the region where patches enter the auroral oval on the nightside (Spogli et al 2009;Prikryl et al 2010;Jacobsen & Dähnn 2014;Jin et al 2015). Patches have also been connected to the occurrence of substorms (Nishimura et al 2013;Zou et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Overview of the 2015 St. Patrick’s day storm and its consequences for RTK and PPP positioning in Norway

Jacobsen

Andalsvik

2016

J. Space Weather Space Clim.

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122

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The 2015 St. Patrick's day storm was the first storm of solar cycle 24 to reach a level of ''Severe'' on the NOAA geomagnetic storm scale. The Norwegian Mapping Authority is operating a national real-time kinematic (RTK) positioning network and has in recent years developed software and services and deployed instrumentation to monitor space weather disturbances. Here, we report on our observations during this event. Strong GNSS (Global Navigation Satellite System) disturbances, measured by the rateof-TEC index (ROTI), were observed at all latitudes in Norway on March 17th and early on March 18th. Late on the 18th, strong disturbances were only observed in northern parts of Norway. We study the ionospheric disturbances in relation to the auroral electrojet currents, showing that the most intense disturbances of GNSS signals occur on the poleward side of poleward-moving current regions. This indicates a possible connection to ionospheric polar cap plasma patches and/or particle precipitation caused by magnetic reconnection in the magnetosphere tail. We also study the impact of the disturbances on the network RTK and Precise Point Positioning (PPP) techniques. The vertical position errors increase rapidly with increasing ROTI for both techniques, but PPP is more precise than RTK at all disturbance levels.

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Statistics of ionospheric disturbances and their correlation with GNSS positioning errors at high latitudes

Cited by 77 publications

References 17 publications

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

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

Climatology of GPS phase scintillation at northern high latitudes for the period from 2008 to 2013

Overview of the 2015 St. Patrick’s day storm and its consequences for RTK and PPP positioning in Norway

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