Reckoning ionospheric scintillation S4 from ROTI over Indian region

Kapil, Chandan; Seemala, G. K.; Shetti, Dadaso J.; Acharya, Rajat

doi:10.1016/j.asr.2021.10.026

Cited by 14 publications

(3 citation statements)

References 33 publications

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“…This is consistent with other researchers' works, such as Bai et al (2012), but a new finding in West Africa during the peak of SC 24. Kapil et al (2022) also confirmed the temporal variation of the S4 index throughout the year 2014 at the Mumbai station. The scintillation occurrence is highly dependent on season, solar activity, and geographical locations.…”

Section: Discussionsupporting

confidence: 74%

“…A special ionospheric scintillation monitoring-GPS receiver is required to record the S4 index, as it is derived from the high rate amplitude of the received signal. Thus, the regular dual GNSS frequency that most commonly records the pseudorange and phase observables at 30-s or 1-s sampling interval cannot be used to derive the S4 index (Kapil et al, 2022).…”

Section: S4 Indexmentioning

confidence: 99%

“…Very severe scintillation conditions can prevent a GPS receiver from locking on to the received signal and can severely reduce the accuracy of position estimates. Thus, scintillation conditions can reduce the accuracy of positioning results (Kapil et al, 2022).…”

Section: S4 Indexmentioning

confidence: 99%

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Relationship between geomagnetic storms and occurrence of ionospheric irregularities in the west sector of Africa during the peak of the 24th solar cycle

Ondede

Rabiu²,

Okoh³

et al. 2022

Front. Astron. Space Sci.

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The study of ionospheric irregularities is important since many technological systems might be influenced by the ionosphere. In this work, we use data from the Global Navigation Satellite Systems (GNSS) receiver installed in Abuja, Nigeria, GPS Scintillation Network Decision Aid (SCINDA) TEC data from the Air Force Research Laboratory (AFRL) data archive, and the geomagnetic data from the World Data Center (WDC) in Kyoto, Japan, to investigate the relationship between geomagnetic storm and ionospheric irregularity occurrences using the rate of change of total electron content (TEC) index (ROTI), with a validation using the S4 indices, during the peak of the 24th solar cycle. The occurrences of irregularities were investigated on day-to-day and seasonal bases. The nighttime ionospheric irregularities, which are attributed to ionospheric plasma irregularities in the equatorial ionospheric F-region, were found to be prevalent. To investigate the relationship between the strength of ionospheric irregularities (ROTI) and the geomagnetic storm (Dst), the periodogram power spectral density (PSD) and regression analysis were used. The results showed that there was no correlation, cc = 0.073, between the Dst and ROTI, implying that the strengths of ionospheric irregularities occurring during geomagnetic storms are not strictly decided by the magnitudes of the storms; this was also confirmed using the S4 index. The impact of geomagnetic storms caused enhanced development or inhibition of ionospheric irregularities. We observed that the bulk of the storms occurring during the period of this study is not associated with ionospheric irregularities. Finally, the investigation showed that the correlation between the ROTI and Dst observed during the coronal mass ejection (CME)-driven geomagnetic storms was higher than that during the corotating interaction region (CIR)-driven geomagnetic storms, during the peak of the 24th solar cycle. The results of this work confirm the findings by other researchers.

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Section: Discussionsupporting

confidence: 74%

Section: S4 Indexmentioning

confidence: 99%

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Relationship between geomagnetic storms and occurrence of ionospheric irregularities in the west sector of Africa during the peak of the 24th solar cycle

Ondede

Rabiu²,

Okoh³

et al. 2022

Front. Astron. Space Sci.

View full text Add to dashboard Cite

show abstract

Leveraging machine learning techniques and GPS measurements for precise TEC rate predictions

Tete,

Otsuka,

Zahra

et al. 2024

GPS Solut

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Ionospheric scintillation characteristics over Indian region from latitudinally-aligned geodetic GPS observations

et al. 2023

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Ionospheric scintillations pose one of the biggest threats to Satellite-Earth communication links in the communication and navigation systems services whose occurrence characteristics could be explained through the strength of fading (amplitude scintillation index; S4) and the rapidity of the fades (decorrelation time; 𝜏0). In the present work, we analyzed the S4 index from a latitudinal array of three geodetic global positioning system (GPS) stations along the Indian longitude sector during the descending phase of the 24th solar cycle. The results show predominant occurrences of scintillations during the post-sunset and nighttime periods indicating the level of scintillations close to equatorial, beyond anomaly crest, and near mid-latitude locations. The strong amplitude scintillations during 2014 and 2015 and their lowest magnitudes during 2016 and 2017 reflect the solar activity dependence of the scintillation occurrences. The directional distribution and 2-dimensional surface sky plots of the S4 index substantiate the occurrence of intense scintillation being more prevalent towards the equatorial location, whereas the weak and moderate scintillations are perceived towards the higher low latitude stations. The occurrences of intense scintillations are confirmed in high solar active years and equinox season at all stations, while the equatorial station presents relatively higher occurrences in winter followed by summer. The summer season witnessed intense occurrences even under moderate to low solar activity years (2016–2017), reflecting the post-midnight occurrences due to meridional thermospheric winds. Moreover, maximum percentage occurrences of weak scintillations in all seasons are evident towards the poleward side, far away from the anomaly crest. The amplitude scintillation frequency during the period is further compared with the solar and geomagnetic indices to substantiate the analysis drawn from the variations. The correlation coefficients between the scintillation index occurrence rate with the solar and geomagnetic in-dices at three GNSS stations provide valuable insights into the relationship between solar activity and scintillation. The results show that the strength and direction of the correlation can vary significantly depending on the specific solar index and location. Thus, emphasize further studies on scintillation occurrences for developing effective forecasting and mitigation models over the Indian low-latitude region.

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Reckoning ionospheric scintillation S4 from ROTI over Indian region

Cited by 14 publications

References 33 publications

Relationship between geomagnetic storms and occurrence of ionospheric irregularities in the west sector of Africa during the peak of the 24th solar cycle

Relationship between geomagnetic storms and occurrence of ionospheric irregularities in the west sector of Africa during the peak of the 24th solar cycle

Leveraging machine learning techniques and GPS measurements for precise TEC rate predictions

Ionospheric scintillation characteristics over Indian region from latitudinally-aligned geodetic GPS observations

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