A Forecasting Ionospheric Real-time Scintillation Tool (FIRST)

Redmon, R. J.; Anderson, D. N.; Caton, R. G.; Bullett, T. W.

doi:10.1029/2010sw000582

Cited by 34 publications

(40 citation statements)

References 25 publications

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“…Figure 6 illustrates scintillation hourly occurrence probabilities at the two sites with respect to Coordinated Universal Time (UTC) (upper) and hours post sunset (lower). Also consistent with numerous previous research findings [2][12] [13] [14], scintillation at high latitudes (a) was more frequent during night time than at other times. Scintillation observed at Jicamarca occurred more frequently at night as well but was greatly concentrated between 1-2 hours post sunset and midnight.…”

Section: Scintillation Occurrence Frequency and Relating Factorssupporting

confidence: 93%

Comparative studies of high-latitude and equatorial ionospheric scintillation characteristics of GPS signals

Jiao

Morton

Taylor

2014

2014 IEEE/ION Position, Location and Navigation Symposium - PLANS 2014

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The ionospheric scintillation phenomenon that affect the accuracy and integrity of Global Navigation Satellite System (GNSS) is mostly observed in high-latitude and equatorial regions. Scintillation events in these two regions, however, are usually influenced by different factors and thus have different characteristics. This paper makes use of real scintillation data collected at Gakona, Alaska, and Jicamarca, Peru during the current solar maximum to investigate and compare scintillation features observed at the two locations. Based on scintillation events extracted from the raw data, several statistical distributions have been established to characterize the intensity, duration and occurrence frequency of amplitude and phase scintillation. Results confirm that scintillation at low latitudes is generally more intense and longer lasting, while high-latitude scintillation is usually dominated by phase fluctuations and shorter events. The occurrence frequency of scintillation, on the other hand, are influenced by a variety of factors.

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Section: Scintillation Occurrence Frequency and Relating Factorssupporting

confidence: 93%

Comparative studies of high-latitude and equatorial ionospheric scintillation characteristics of GPS signals

Jiao

Morton

Taylor

2014

2014 IEEE/ION Position, Location and Navigation Symposium - PLANS 2014

View full text Add to dashboard Cite

show abstract

“…Recently, some efforts have been made in the attempt to predict EPB structures and/or scintillation (e.g., Retterer et al, 2005;Retterer, 2005;Kelley and Retterer, 2008;Rezende et al, 2010;Redmon et al, 2010;Carter et al, 2014a, b;Sousasantos et al, 2017). These works essentially deal only with the existence (or nonexistence) of EPB structures and/or scintillation; however, according to the results presented in Fig.…”

Section: Resultsmentioning

confidence: 98%

Climatology of the scintillation onset over southern Brazil

et al. 2018

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Abstract. This work presents an analysis of the climatology of the onset time of ionospheric scintillations at low latitude over the southern Brazilian territory near the peak of the equatorial ionization anomaly (EIA). Data from L1 frequency GPS receiver located in Cachoeira Paulista (22.4 • S, 45.0 • W; dip latitude 16.9 • S), from September 1998 to November 2014, covering a period between solar cycles 23 and 24, were used in the present analysis of the scintillation onset time. The results show that the start time of the ionospheric scintillation follows a pattern, starting about 40 min earlier, in the months of November and December, when compared to January and February. The analyses presented here show that such temporal behavior seems to be associated with the ionospheric prereversal vertical drift (PRVD) magnitude and time. The influence of solar activity in the percentage of GPS links affected is also addressed together with the respective ionospheric prereversal vertical drift behavior. Based on this climatological study a set of empirical equations is proposed to be used for a GNSS alert about the scintillation prediction. The identification of this kind of pattern may support GNSS applications for aviation and oil extraction maritime stations positioning.

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“…In their development of a Forecasting Ionospheric Real‐time Scintillation Tool, Redmon et al . [] have found a threshold for the virtual height h ′ F , derived from ground‐based ionosonde observations near the geomagnetic equator, for the onset of equatorial VHF/UHF scintillation activity in the Peruvian longitude sector. Carter et al .…”

Section: Introductionmentioning

confidence: 99%

Development of intermediate‐scale structure at different altitudes within an equatorial plasma bubble: Implications for L‐band scintillations

et al. 2017

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An important aspect of the development of intermediate‐scale length (approximately hundred meters to few kilometers) irregularities in an equatorial plasma bubble (EPB) that has not been considered in the schemes to predict the occurrence pattern of L‐band scintillations in low‐latitude regions is how these structures develop at different heights within an EPB as it rises in the postsunset equatorial ionosphere due to the growth of the Rayleigh‐Taylor instability. Irregularities at different heights over the dip equator map to different latitudes, and their spectrum as well as the background electron density determine the strength of L‐band scintillations at different latitudes. In this paper, VHF and L‐band scintillations recorded at different latitudes together with theoretical modeling of the scintillations are used to study the implications of this structuring of EPBs on the occurrence and strength of L‐band scintillations at different latitudes. Theoretical modeling shows that while S4 index for scintillations on a VHF signal recorded at an equatorial station may be >1, S4 index for scintillations on a VHF signal recorded near the crest of the equatorial ionization anomaly (EIA) generally does not exceed the value of 1 because the intermediate‐scale irregularity spectrum at F layer peak near the EIA crest is shallower than that found in the equatorial F layer peak. This also explains the latitudinal distribution of L‐band scintillations. Thus, it is concluded that there is greater structuring of an EPB on the topside of the equatorial F region than near the equatorial F layer peak.

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A Forecasting Ionospheric Real-time Scintillation Tool (FIRST)

Cited by 34 publications

References 25 publications

Comparative studies of high-latitude and equatorial ionospheric scintillation characteristics of GPS signals

Comparative studies of high-latitude and equatorial ionospheric scintillation characteristics of GPS signals

Climatology of the scintillation onset over southern Brazil

Development of intermediate‐scale structure at different altitudes within an equatorial plasma bubble: Implications for L‐band scintillations

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