Ionospheric Effects on GNSS Performance

Béniguel, Yannick; Angling, Matthew; Banfi, E.; Bourga, C.; Cueto, M.; Fleury, Rolland; García-Rigo, Alberto; Hamel, Pierrick; Hartmann, R.; Hernández‐Pajares, M.; Jakowski, N.; Kauristie, Kirsti; Orús, R.; Prieto-Cerdeira, R.; Valette, Jean-Jacques; Kamp, Max van de

doi:10.1109/navitec.2012.6423122

Cited by 5 publications

(3 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In general, 4 to 8 values of STEC can be computed from a single receiver, corresponding to different line‐of‐sight directions for several GPS satellites in view, covering in this way most of the values of solar zenith angle χ . Presently, it is running in real time, with a latency of 30 s and since 2012 has been used in the context of the European Space Agency (ESA) MONITOR and MONITOR‐2 projects [see Beniguel et al , and Hernández‐Pajares et al , respectively], supported also by the RTIGS project [see Caissy et al , ].…”

Section: Input Datamentioning

confidence: 99%

GPS as a solar observational instrument: Real‐time estimation of EUV photons flux rate during strong, medium, and weak solar flares

et al. 2015

View full text Add to dashboard Cite

In this manuscript, the authors show how the Global Navigation Satellite Systems, GNSS (exemplified in the Global Positioning System, GPS), can be efficiently used for a very different purpose from that for which it was designed as an accurate Solar observational tool, already operational from the open global GPS measurements available in real‐time, and with some advantages regarding dedicated instruments onboard spacecraft. The very high correlation of the solar extreme ultraviolet (EUV) photon flux rate in the 26–34 mm spectral band, obtained from the solar EUV monitor instrument onboard the SOHO spacecraft during Solar flares, is shown with the GNSS solar flare activity indicator (GSFLAI). The GSFLAI is defined as the gradient of the ionospheric vertical total electron content rate versus the cosine of the Solar zenith angle in the day hemisphere (which filters out nonsolar over ionization), and it is measured from data collected by a global network of dual frequency GPS receivers (giving in this way continuous coverage). GSFLAI for 60 X class flares, 320 M class flares, and 300 C class flares, occurred since 2001, were directly compared with the EUV solar flux rate data to show existing correlations. It was found that the GSFLAI and EUV flux rate present the same linear relationship for all classes of flares, not only the strong and medium intensity ones, X and M class, as in previous works, but also for the weakest C class solar flares, which is a remarkable result.

show abstract

Section: Input Datamentioning

confidence: 99%

GPS as a solar observational instrument: Real‐time estimation of EUV photons flux rate during strong, medium, and weak solar flares

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Infrastructure damages caused by an extreme geomagnetic storm are not only effects of the magnetosphere–ionosphere disruptions. Electromagnetic fields, (such as those that originated in the electrically charged ionosphere), may also seriously affect propagation of the radio waves [ 5 , 6 ]. As mentioned above, the upper, ionized part of the atmosphere—the ionosphere—is tightly connected with the geomagnetic field [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Sub-Auroral and Mid-Latitude GNSS ROTI Performance during Solar Cycle 24 Geomagnetic Disturbed Periods: Towards Storm’s Early Sensing

Kotulak

Krankowski

Froń

et al. 2021

Sensors

View full text Add to dashboard Cite

Geomagnetic storms—triggered by the interaction between Earth’s magnetosphere and interplanetary magnetic field, driven by solar activity—are important for many Earth-bound aspects of life. Serious events may impact the electroenergetic infrastructure, but even weaker storms generate noticeable irregularities in the density of ionospheric plasma. Ionosphere electron density gradients interact with electromagnetic radiation in the radiofrequency domain, affecting sub- and trans-ionospheric transmissions. The main objective of the manuscript is to find key features of the storm-induced plasma density behaviour irregularities in regard to the event’s magnitude and general geomagnetic conditions. We also aim to set the foundations for the mid-latitude ionospheric plasma density now-casting irregularities. In the manuscript, we calculate the GPS+GLONASS-derived rate of TEC (total electron content) index (ROTI) for the meridional sector of 10–20∘ E, covering the latitudes between 40 and 70∘ N. Such an approach reveals equatorward spread of the auroral TEC irregularities reaching down to mid-latitudes. We have assessed the ROTI performance for 57 moderate-to-severe storms that occurred during solar cycle 24 and analyzed their behaviors in regard to the geomagnetic conditions (described by Kp, Dst, AE, Sym-H and PC indices).

show abstract

“…Several ionospheric fluctuations models have already been developed [11,12]; however, most of them focus on weak scintillations in the radio signals. Strong ionospheric irregularities may cause serious signal degradation and harmfully impact precise positioning [13]. Satellite navigation is based on the observations from satellites located in various parts of the sky above the receiver-a proper geometry can provide a higher accuracy [14].…”

Section: Introductionmentioning

confidence: 99%

Climatology Characteristics of Ionospheric Irregularities Described with GNSS ROTI

et al. 2020

View full text Add to dashboard Cite

At equatorial and high latitudes, the intense ionospheric irregularities and plasma density gradients can seriously affect the performances of radio communication and satellite-based navigation systems; that represents a challenging topic for the scientific and engineering communities and operational use of communication and navigation services. The GNSS-based ROTI (rate of TEC index) is one of the most widely used indices to monitor the occurrence and intensity of ionospheric irregularities. In this paper, we examined the long-term performance of the ROTI in terms of finding the climatological characteristics of TEC fluctuations. We considered the different scale temporal signatures and checked the general sensitivity to the solar and geomagnetic activity. We retrieved and analyzed long-term time-series of ROTI values for two chains of GNSS stations located in European and North-American regions. This analysis covers three full years of the 24th solar cycle, which represent different levels of solar activity and include periods of intense geomagnetic storms. The ionospheric irregularities’ geographical distribution, as derived from ROTI, shows a reasonable consistency to be found within the poleward/equatorward boundaries of the auroral oval specified by empirical models. During magnetic midnight and quiet-time conditions, the equatorward boundary of the ROTI-derived ionospheric irregularity zone was observed at 65–70∘ of north magnetic latitude, while for local noon conditions this boundary was more poleward at 75–85 magnetic latitude. The ionospheric irregularities of low-to-moderate intensity were found to occur within the auroral oval at all levels of geomagnetic activity and seasons. At moderate and high levels of solar activity, the intensities of ionospheric irregularities are larger during local winter conditions than for the local summer and polar day conditions. We found that ROTI displays a selective latitudinal sensitivity to the auroral electrojet activity—the strongest dependence (correlation R > 0.6–0.8) was observed within a narrow latitudinal range of 55–70∘N magnetic latitude, which corresponded to a band of the largest ROTI values within the auroral oval zone expanded equatorward during geomagnetic disturbances.

show abstract

Ionospheric Effects on GNSS Performance

Cited by 5 publications

References 3 publications

GPS as a solar observational instrument: Real‐time estimation of EUV photons flux rate during strong, medium, and weak solar flares

GPS as a solar observational instrument: Real‐time estimation of EUV photons flux rate during strong, medium, and weak solar flares

Sub-Auroral and Mid-Latitude GNSS ROTI Performance during Solar Cycle 24 Geomagnetic Disturbed Periods: Towards Storm’s Early Sensing

Climatology Characteristics of Ionospheric Irregularities Described with GNSS ROTI

Contact Info

Product

Resources

About