Characterization of the low latitude plasma density irregularities observed using C/NOFS and SCINDA data

Andima, Geoffrey; Amabayo, Emirant B.; Jurua, Edward; Cilliers, Pierre J.

doi:10.1016/j.asr.2017.08.003

Cited by 4 publications

(5 citation statements)

References 32 publications

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“…The distributions of ionospheric irregularities and scintillations over both LT and seasons show similar patterns. This is in agreement with the results obtained in earlier studies (Burke et al 2003;Andima et al 2018). Therefore, the similar LT and seasonal trend obtained provide statistical evidence for the association of amplitude scintillation events recorded by the GPS-SCINDA in our study area to ionospheric irregularities recorded in situ by Swarm faceplate.…”

Section: Discussionsupporting

confidence: 93%

“…Previous studies have shown that scintillations recorded on the ground are associated with ionospheric irregularities encountered in situ (Roddy et al 2010;Nishioka et al 2011;Akala et al 2017;Andima et al 2018). Roddy et al (2010) and Nishioka et al (2011) compared ionospheric irregularity observations made by Communication Navigation Outage Forecasting System (C/NOFS) and 250-MHz scintillations over Christmas Island ( 3 • N, 157 • W ).…”

Section: Introductionmentioning

confidence: 99%

“…lat 0.18 • N ) with C/NOFS data. Andima et al (2018) characterized the low latitude ion density irregularities measured by C/NOFS from 2011 to 2013. This was supported by ground-based data from the SCINDA receivers at Makerere (Lon 32.6 • E , Lat 0.3 • N , and Dip.…”

Section: Introductionmentioning

confidence: 99%

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Ionospheric irregularities and scintillations: a direct comparison of in situ density observations with ground-based L-band receivers

Aol

Buchert

Jurua

2020

Earth Planets Space

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Ionospheric irregularities can affect satellite communication and navigation by causing scintillations of radio signals. The scintillations are routinely measured using ground-based networks of receivers. This study presents observations of ionospheric irregularities by Langmuir probes on the Swarm satellites. They are compared with amplitude scintillation events recorded by the Global Positioning System-Scintillation Network and Decision Aid (GPS-SCINDA) receiver installed in Mbarara (Lat: $$0.6^{\circ }\hbox {S}$$ 0 . 6 ∘ S , Lon: $$30.8^{\circ }\hbox {E}$$ 30 . 8 ∘ E , Mag. lat: $$10.2^{\circ }\hbox {S}$$ 10 . 2 ∘ S ). The study covers the years from 2014 to 2018 when both data sets were available. It was found that the ground-based amplitude scintillations were enhanced when Swarm registered ionospheric irregularities for a large number of passes. The number of matching observations was greater for Swarm A and C which orbited at lower altitudes compared to Swarm B. However, some counterexamples, i.e., cases when in situ electron density fluctuations were not associated with any observed L-band amplitude scintillation and vice versa, were also found. Therefore, mismatches between observed irregularity structures and scintillations can occur just over a few minutes and within distances of a few tens of kilometers. The amplitude scintillation strength, characterized by the S4 index was estimated from the electron density data using the well-known phase screen model for weak scattering. The derived amplitude scintillation was on average lower for Swarm B than for A and C and less in accordance with the observed range. Irregularities at an altitude of about 450 km contribute strongly to scintillations in the L-band, while irregularities at about 510-km altitude contribute significantly less. We infer that in situ density fluctuations observed on passes over or near Mbarara may be used to indicate the risk that ionospheric radio wave scintillations occur at that site.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Ionospheric irregularities and scintillations: a direct comparison of in situ density observations with ground-based L-band receivers

Aol

Buchert

Jurua

2020

Earth Planets Space

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“…simultaneous observations of amplitude scintillations at spaced locations by receiving VHF beacon and/or L-band signals from geostationary and GPS satellites have been employed to investigate zonal drift in the equatorial ionosphere (Andima et al, 2018;Basu et al, 1996;Ji et al, 2011;Otsuka et al, 2006;Valladares et al, 2002;Wiens et al, 2006). Based on prominent scintillations, they found that horizontal plasma flows are about 50-150 m/s eastward during 2000-0400 LT.…”

Section: < Accepted Manuscript >mentioning

confidence: 99%

“…The network comprises sites distributed globally with local cooperators helping maintenance of the sites. The purpose of SCINDA is not only to focus on the specification and prediction of satellite communication degradation due to ionospheric scintillation, but also to facilitate scientific studies on the geomagnetic equatorial region (Ackah et al, 2011;Andima et al, 2018;McNamara et al, 2013).…”

Section: < Accepted Manuscript >mentioning

confidence: 99%

VHF scintillations and plasma drifts observed in southern Taiwan during the declining phase of solar cycle 24

Mao¹,

Lin²

2021

Terr. Atmos. Ocean. Sci.

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Automated power spectrum analysis of low-latitude ionospheric scintillations recorded using software GNSS receiver

Sethi

Dashora

2020

GPS Solut

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Characterization of the low latitude plasma density irregularities observed using C/NOFS and SCINDA data

Cited by 4 publications

References 32 publications

Ionospheric irregularities and scintillations: a direct comparison of in situ density observations with ground-based L-band receivers

Ionospheric irregularities and scintillations: a direct comparison of in situ density observations with ground-based L-band receivers

VHF scintillations and plasma drifts observed in southern Taiwan during the declining phase of solar cycle 24

Automated power spectrum analysis of low-latitude ionospheric scintillations recorded using software GNSS receiver

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