Investigation of ionospheric irregularities and scintillation using TEC at high latitude

Tiwari, Rajesh; Strangeways, H.J.; Tiwari, Saurabh; Ahmed, Arslan

doi:10.1016/j.asr.2013.06.010

Cited by 47 publications

(28 citation statements)

References 25 publications

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“…At high latitudes, these gradients are mostly caused by plasma processes associated with dynamic auroral processes, such as energetic particle precipitation and high-speed plasma convection (Keskinen and Ossakow 1983). Many researchers have used GPS signals to study ionospheric processes (e.g., Pi et al 1997;Aarons and Lin 1999;Valladares et al 2004;Jakowski et al 2008Jakowski et al , 2012Tiwari et al 2013;Prikryl et al 2014;Cherniak and Zakharenkova 2015;van der Meeren et al 2014;Jacobsen and Andalsvik 2016). Recently, Cherniak and Zakharenkova (2016a) applied data of the GPS receivers onboard five low earth orbit satellites to examine the occurrence of the topside ionospheric irregularities under the geomagnetic storm conditions and to compare them with effects registered concurrently in the ground-based GPS data.…”

Section: Introductionmentioning

confidence: 99%

New advantages of the combined GPS and GLONASS observations for high-latitude ionospheric irregularities monitoring: case study of June 2015 geomagnetic storm

Cherniak

Zakharenkova

2017

Earth Planets Space

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Monitoring, tracking and nowcasting of the ionospheric plasma density disturbances using dual-frequency measurements of the Global Positioning System (GPS) signals are effectively carried out during several decades. Recent rapid growth and modernization of the ground-based segment gives an opportunity to establish a great database consisting of more than 6000 stations worldwide which provide GPS signals measurements with an open access. Apart of the GPS signals, at least two-third of these stations receive simultaneously signals transmitted by another Global Navigation Satellite System (GNSS)-the Russian system GLONASS. Today, GLONASS signal measurements are mainly used in navigation and geodesy only and very rarely for ionosphere research. We present the first results demonstrating advantages of using several independent but compatible GNSS systems like GPS and GLONASS for improvement of the permanent monitoring of the high-latitude ionospheric irregularities. For the first time, the high-resolution twodimensional maps of ROTI perturbation were made using not only GPS but also GLONASS measurements. We extend the use of the ROTI maps for analyzing ionospheric irregularities distribution. We demonstrate that the meridional slices of the ROTI maps can be effectively used to study the occurrence and temporal evolution of the ionospheric irregularities. The meridional slices of the geographical sectors with a high density of the GPS and GLONASS measurements can represent spatio-temporal dynamics of the intense ionospheric plasma density irregularities with very high resolution, and they can be effectively used for detailed study of the space weather drivers on the processes of the ionospheric irregularities generation, development and their lifetimes. Using a representative database of ~5800 ground-based GNSS stations located worldwide, we have investigated the occurrence of the high-latitude ionospheric plasma density irregularities during the geomagnetic storm of June 22-23, 2015.

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Section: Introductionmentioning

confidence: 99%

New advantages of the combined GPS and GLONASS observations for high-latitude ionospheric irregularities monitoring: case study of June 2015 geomagnetic storm

Cherniak

Zakharenkova

2017

Earth Planets Space

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“…To get the Fp index, the 30-s vertical TEC (VTEC) was first calculated from these data (see Hofmann-Wellenhof et al 1997 andTiwari et al 2013 for the details). To reduce the horizontal gradient of ionospheric electron density and the multipath effect, the VTEC with the elevation angles of satellites less than 15° were ignored.…”

Section: Databasementioning

confidence: 99%

GPS TEC fluctuations over Tromsø, Norway, in the solar minimum

Chen¹,

Lee²,

Chu³

et al. 2017

Terr. Atmos. Ocean. Sci.

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This study investigated GPS TEC fluctuations over the high-latitude site, Tromsø, Norway (69.66°N, 18.94°E) The high electron density structure that resulted from the auroral activity caused Fp ≥ 50 when it located in the E region or extended from the E region to the F region. The findings are that Fp ≥ 50 at auroral region mainly relates to the auroral activity. The Fp seasonal variation can be explained by the effect of sunlight and the geometry of the magnetotail. Occurrence of irregularities and their maximal intensity are increased with Kp and AE. Strong irregularities almost only occur in the magnetic disturbance period. Irregularities in the E region or in the E and F regions both can cause Fp ≥ 50.

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“…The steep ionospheric density gradients and irregularities associated with auroral and cusp precipitation in the high latitude cause phase and amplitude fluctuations of GPS signals and have extensively been studied using ground-based GPS data (Skone and Cannon 1995;Mitchell et al 2004;Alfonsi et al 2011;Watson et al 2011;Jiao et al 2013;Prikryl et al 2013Prikryl et al , 2014Tiwari et al 2013;Cherniak et al 2014;Jacobsen and Andalsvik 2016). However, there are still several unresolved limitations associated with ground-based GPS monitoring of ionospheric irregularities.…”

Section: Introductionmentioning

confidence: 99%

High-latitude ionospheric irregularities: differences between ground- and space-based GPS measurements during the 2015 St. Patrick’s Day storm

Cherniak

Zakharenkova

2016

Earth Planet Sp

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We present an analysis of ionospheric irregularities at high latitudes during the 2015 St. Patrick's Day storm. Our study used measurements from ~2700 ground-based GPS stations and GPS receivers onboard five low earth orbit (LEO) satellites-Swarm A, B and C, GRACE and TerraSAR-X-that had close orbit altitudes of ~500 km, and the Swarm in situ plasma densities. An analysis of the rate of TEC index (ROTI) derived from LEO-GPS data, together with Swarm in situ plasma probe data, allowed us to examine the topside ionospheric irregularities and to compare them to the main ionospheric storm effects observed in ground-based GPS data. We observed strong ionospheric irregularities in the topside ionosphere during the storm's main phase that were associated with storm-enhanced density (SED) formation at mid-latitudes and further evolution of the SED plume to the polar tongue of ionization (TOI). Daily ROTI maps derived from ground-based and LEO-GPS measurements show the pattern of irregularities oriented in the local noon-midnight direction, which is a signature of SED/TOI development across the polar cap region. Analysis of the Swarm in situ plasma measurements revealed that, during the storm's main phase, all events with extremely enhanced plasma densities (>10 6 el/cm 3 ) in the polar cap were observed in the Southern Hemisphere. When Swarm satellites crossed these enhancements, degradation of GPS performance was observed, with a sudden decrease in the number of GPS satellites tracked. Our findings indicate that polar patches and TOI structures in the topside ionosphere were predominantly observed in the Southern Hemisphere, which had much higher plasma densities than the Northern Hemisphere, where SED/TOI structures have already been reported earlier. LEO-GPS data (ROTI and topside TEC) were consistent with these results.

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Investigation of ionospheric irregularities and scintillation using TEC at high latitude

Cited by 47 publications

References 25 publications

New advantages of the combined GPS and GLONASS observations for high-latitude ionospheric irregularities monitoring: case study of June 2015 geomagnetic storm

New advantages of the combined GPS and GLONASS observations for high-latitude ionospheric irregularities monitoring: case study of June 2015 geomagnetic storm

GPS TEC fluctuations over Tromsø, Norway, in the solar minimum

High-latitude ionospheric irregularities: differences between ground- and space-based GPS measurements during the 2015 St. Patrick’s Day storm

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