GPS phase scintillation observed over a high-latitude Antarctic station during solar minimum

Ngwira, Chigomezyo M.; McKinnell, Lee-Anne; Cilliers, Pierre J.

doi:10.1016/j.jastp.2010.03.014

Cited by 26 publications

(22 citation statements)

References 21 publications

(25 reference statements)

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“…CHAIN data are supplemented by scintillation data from the same type of receiver operated in Gakona, Alaska (Jiao et al, 2013). GISTMs have been operated in the European sector in Scandinavia and in southern high latitudes, primarily in Antarctica (De Franceschi et al, 2006;Li et al, 2010;Ngwira et al, 2010;Prikryl et al, 2011b, their Table 1). South Pole GPS receiver operations are a collaborative effort of University of Bath and Siena College.…”

Section: Instruments and Datamentioning

confidence: 99%

GPS phase scintillation at high latitudes during geomagnetic storms of 7–17 March 2012 – Part 2: Interhemispheric comparison

et al. 2015

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Abstract. During the ascending phase of solar cycle 24, a series of interplanetary coronal mass ejections (ICMEs) in the period 7-17 March 2012 caused geomagnetic storms that strongly affected high-latitude ionosphere in the Northern and Southern Hemisphere. GPS phase scintillation was observed at northern and southern high latitudes by arrays of GPS ionospheric scintillation and TEC monitors (GISTMs) and geodetic-quality GPS receivers sampling at 1 Hz. Mapped as a function of magnetic latitude and magnetic local time (MLT), the scintillation was observed in the ionospheric cusp, the tongue of ionization fragmented into patches, sun-aligned arcs in the polar cap, and nightside auroral oval and subauroral latitudes. Complementing a companion paper (Prikryl et al., 2015a) that focuses on the highlatitude ionospheric response to variable solar wind in the North American sector, interhemispheric comparison reveals commonalities as well as differences and asymmetries between the northern and southern high latitudes, as a consequence of the coupling between the solar wind and magnetosphere. The interhemispheric asymmetries are caused by the dawn-dusk component of the interplanetary magnetic field controlling the MLT of the cusp entry of the storm-enhanced density plasma into the polar cap and the orientation relative to the noon-midnight meridian of the tongue of ionization.

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Section: Instruments and Datamentioning

confidence: 99%

GPS phase scintillation at high latitudes during geomagnetic storms of 7–17 March 2012 – Part 2: Interhemispheric comparison

et al. 2015

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“…At high latitudes, irregularities causing scintillation are associated with large-scale plasma structures and scintillation occurrence is mainly enhanced during geomagnetic storms, even in the solar minimum years (Aarons et al 2000;Ngwira et al 2010 and the references therein). The plasma structuring is controlled by the magnetic coupling between the interplanetary magnetic field (IMF) and the magnetosphere (Hunsucker and Hargreaves 2003).…”

Section: Ionospheric Effects On Gnss Receiver Performancementioning

confidence: 99%

“…In this study, the 60-s SigmaPhi (Phi60) values were used. S 4 was not considered since it was generally very low, even during periods of enhanced Phi60, as is usually the case at high latitudes (Kintner et al 2007;Ngwira et al 2010). The percentage occurrence of Phi60 for 1 h MLT bin was calculated as:…”

Section: Ionospheric Effects On Gnss Receiver Performancementioning

confidence: 99%

Impact and mitigation of space weather effects on GNSS receiver performance

Sreeja

2016

Geosci. Lett.

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It is well known that Global Navigation Satellite System (GNSS) signals suffer from a number of vulnerabilities, out of which a potential severe vulnerability is the effect of space weather. Space weather effects on the signals transmitted by GNSS include the effect of ionospheric perturbations and solar radio bursts. Intense solar radio bursts occurring in the L-band can impact the tracking performance of GNSS receivers located in the sunlit hemisphere of the Earth and are therefore a potential threat to safety-critical systems based on GNSS. Consequently monitoring these events is important for suitable warnings to be issued in support to related services and applications. On the other hand, the space weather effects leading to ionospheric perturbations on the GNSS signals are either due to dispersion or scintillation caused by plasma density irregularities. Scintillation can cause cycle slips and degrade the positioning accuracy in GNSS receivers. The high-latitude scintillation occurrence is known to correlate with changes in the solar and interplanetary conditions along with a consequential impact on GNSS receiver tracking performance. An assessment of the GNSS receiver tracking performance under scintillation can be analysed through the construction of receiver phase-locked loop (PLL) tracking jitter maps. These maps can offer a potentially useful tool to provide users with the prevailing tracking conditions under scintillation over a certain area and also be used to help mitigate the effects of scintillation on GNSS positioning. This paper reviews some of recent research results related to the impact and mitigation of space weather effects on GNSS receiver performance.

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“…Energetic electron precipitation and current systems are the dominant factors in producing irregularities in the auroral and polar regions, where the scintillations are stronger in auroral zone [2]. High latitude scintillations have been widely studied using GPS receivers [3]. Phase scintillations in the polar cap are often associated with large-scale structures such as patches and arcs [4].…”

Section: Previous Workmentioning

confidence: 99%