Temporal and spatial variations of GPS TEC and phase during auroral substorms and breakups

Prikryl, P.; Weygand, J. M.; Ghoddousi‐Fard, Reza; Jayachandran, P. T.; Themens, David R.; McCaffrey, Anthony M.; Kunduri, B.; Nikitina, Lidia

doi:10.1016/j.polar.2020.100602

Cited by 6 publications

(4 citation statements)

References 73 publications

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“…The CHAIN GPS phase variation has been linked to polar cap patches, cusp, and auroral precipitation/currents (Prikryl et al, 2011(Prikryl et al, , 2016(Prikryl et al, , 2021a. While this is not the focus of the present paper, it is of interest to compare the above events in terms of the temporal and spatial occurrence of the GPS TEC and phase variation.…”

Section: Gps Phase Variation In the Cusp Polar Cap And Auroral Ovalmentioning

confidence: 97%

“…The GPS ionospheric pierce points (IPPs) at 110 km are shown as circles scaled by the CHAIN GPS phasevariation values, σ . It has been shown (Prikryl et al, 2016(Prikryl et al, , 2021a that, in the auroral zone, IPPs of strong GPS phase scintillation are largely collocated with the electrojet currents. During the period between 15:40 and 17:40 UT of antisunward flows driven by the southward B z before it reversed to northward (Fig.…”

Section: Event Of 6 March 2016mentioning

confidence: 99%

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Multi-instrument observations of polar cap patches and traveling ionospheric disturbances generated by solar wind Alfvén waves coupling to the dayside magnetosphere

Prikryl

Gillies²,

Themens³

et al. 2022

Ann. Geophys.

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Abstract. During minor to moderate geomagnetic storms, caused by corotating interaction regions (CIRs) at the leading edge of high-speed streams (HSSs), solar wind Alfvén waves modulated the magnetic reconnection at the dayside magnetopause. The Resolute Bay Incoherent Scatter Radars (RISR-C and RISR-N), measuring plasma parameters in the cusp and polar cap, observed ionospheric signatures of flux transfer events (FTEs) that resulted in the formation of polar cap patches. The patches were observed as they moved over the RISR, and the Canadian High-Arctic Ionospheric Network (CHAIN) ionosondes and GPS receivers. The coupling process modulated the ionospheric convection and the intensity of ionospheric currents, including the auroral electrojets. The horizontal equivalent ionospheric currents (EICs) are estimated from ground-based magnetometer data using an inversion technique. Pulses of ionospheric currents that are a source of Joule heating in the lower thermosphere launched atmospheric gravity waves, causing traveling ionospheric disturbances (TIDs) that propagated equatorward. The TIDs were observed in the SuperDual Auroral Radar Network (SuperDARN) high-frequency (HF) radar ground scatter and the detrended total electron content (TEC) measured by globally distributed Global Navigation Satellite System (GNSS) receivers.

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Section: Gps Phase Variation In the Cusp Polar Cap And Auroral Ovalmentioning

confidence: 97%

Section: Event Of 6 March 2016mentioning

confidence: 99%

Multi-instrument observations of polar cap patches and traveling ionospheric disturbances generated by solar wind Alfvén waves coupling to the dayside magnetosphere

Prikryl

Gillies²,

Themens³

et al. 2022

Ann. Geophys.

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“…The nightside auroral oval is one of the important regions for scintillation of the global navigation satellite system (GNSS) radio signal (De Franceschi et al., 2019; Prikryl et al., 2015; Spogli et al., 2009). The nightside auroral oval is filled with localized and transient auroral structures during storms and substorms (Akasofu, 1964; Nishimura et al., 2021), and scintillation is often associated with active auroral forms (Hosokawa et al., 2014; Prikryl et al., 2013, 2021). In addition to substorm aurora, scintillation is enhanced near the poleward boundary of the auroral oval, particularly when polar cap patches interact with the nightside auroral oval (Jin et al., 2016; van der Meeren et al., 2015).…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the traditional scintillation indices, alternative indices have been used as a measure of scintillation. 1‐Hz sampling receiver data have been used to create proxy scintillation indices (Ahmed et al., 2015; Mrak et al., 2020; Prikryl et al., 2021). The rate of TEC index has been attempted for inferring ionospheric irregularities (Cherniak et al., 2018).…”

Section: Introductionmentioning

confidence: 99%

Nightside High‐Latitude Phase and Amplitude Scintillation During a Substorm Using 1‐Second Scintillation Indices

et al. 2023

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We examined evolution of Global Positioning System (GPS) scintillation during a substorm in the nightside high latitude ionosphere, using 1‐second phase and amplitude scintillation indices from the Canadian High Arctic Ionospheric Network (CHAIN) network. The traditional 1‐minute scintillation indices showed that the phase scintillation was dominant, while the amplitude scintillation was weak. However, the 1‐second amplitude scintillation occurred more often in association with major auroral structures (polar cap arc, growth phase arc, onset arc, poleward expanding arc, poleward boundary intensification, and diffuse aurora) that were detected by the THEMIS all‐sky imagers (ASIs). The 1‐minute index missed much of the amplitude fluctuations because they only lasted ∼10 seconds near a local peak or at the gradients of the auroral structures. The 1‐second phase scintillation was concurrent with the amplitude scintillation but was much weaker than the 1‐minute phase scintillation. The frequency spectral analysis showed that the spectral power above ∼1 Hz was diffractive and below ∼1 Hz was refractive. We suggest that the amplitude scintillation in the high‐latitude ionosphere is much more common than previously considered, and that a short time window of the order of 1 second should be used to detect the scintillation. The 1‐minute phase scintillation index is largely influenced by refractive effects due to total electron content (TEC) variations, and the spectral power below ∼1 Hz should be removed to identify diffractive scintillation.

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On estimating the phase scintillation index using TEC provided by ISM and IGS professional GNSS receivers and machine learning

Imam

Alfonsi

Spogli

et al. 2024

Advances in Space Research

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Temporal and spatial variations of GPS TEC and phase during auroral substorms and breakups

Cited by 6 publications

References 73 publications

Multi-instrument observations of polar cap patches and traveling ionospheric disturbances generated by solar wind Alfvén waves coupling to the dayside magnetosphere

Multi-instrument observations of polar cap patches and traveling ionospheric disturbances generated by solar wind Alfvén waves coupling to the dayside magnetosphere

Nightside High‐Latitude Phase and Amplitude Scintillation During a Substorm Using 1‐Second Scintillation Indices

On estimating the phase scintillation index using TEC provided by ISM and IGS professional GNSS receivers and machine learning

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