Global Positioning System measurements of the ionospheric zonal apparent velocity at Cachoeira Paulista in Brazil

Kil, H.; Kintner, P. M.; Paula, E. R. de; Kantor, I. J.

doi:10.1029/1999ja000244

Cited by 78 publications

(134 citation statements)

References 38 publications

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“…5a). We have selected the period of 22:00-24:00 LT because throughout this time the scintillation-producing irregularities can be considered for practical purposes to drift at comparable velocities with the background plasma (Kil et al, 2000(Kil et al, , 2002Engavale et al, 2005). Before 22:00 LT, due to the presence of perturbation electric fields associated with the Rayleigh-Taylor instability, the irregularities are still growing and the values of V zonal may present great variability Engavale et al, 2005), whereas after 24:00 LT the scintillation-producing irregularities start to decay faster by cross-field diffusion (Basu et al, 1978).…”

Section: Ionospheric Irregularity Zonal Drift Velocitiesmentioning

confidence: 99%

“…In the South American sector, the zonal drift of scintillationproducing irregularities has been studied in the last few decades through the detection of VHF geostationary satellite signals (Abdu et al, 1985;Basu et al, 1996;de Paula et al, 2010), from UHF geosynchronous satellite measurements Sheehan and Valladares, 2004), and through an L-band GPS-spaced antenna system (Kil et al, 2000(Kil et al, , 2002Ledvina et al, 2004;Kintner et al, 2004;Muella et al, 2013Muella et al, , 2014. Basu et al (1996) estimated the zonal drift of the kilometer-scale irregularities causing VHF scintillations above the equatorial site of Ancón (MLAT 1.46 • N) in Peru and at the low-latitude station of Agua Verde (MLAT 11.3 • S) in Chile.…”

Section: Introductionmentioning

confidence: 99%

“…This threshold of the S 4 index may be considered to be above the level of noise and multipath effects. The crosscorrelation function C(τ ) between the time sequences S 1 and S 2 of two signal intensities is given as (Kil et al, 2000) 1204 M. T. A. H. Muella et al: Climatology and modeling of ionospheric scintillations…”

Section: Introductionmentioning

confidence: 99%

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Climatology and modeling of ionospheric scintillations and irregularity zonal drifts at the equatorial anomaly crest region

et al. 2017

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Abstract. In this study the climatology of ionospheric scintillations and the zonal drift velocities of scintillationproducing irregularities are depicted for a station located under the southern crest of the equatorial ionization anomaly. Then, the α−µ ionospheric fading model is used for the firstand second-order statistical characterization of amplitude scintillations. In the statistical analyzes, data are used from single-frequency GPS receivers acquired during ∼ 17 years (September 1997-November 2014 at Cachoeira Paulista (22.4 • S; 45.0 • W), Brazil. The results reveal that the nocturnal occurrence of scintillations follows the seasonal distribution of plasma bubble irregularities observed in the longitudinal sector of eastern South America. In addition to the solar cycle dependence, the results suggest that the occurrence climatology of scintillations is also modulated by the secular variation in the dip latitude of Cachoeira Paulista, since the maximum occurrence of scintillations during the peak of solar cycle 24 was ∼ 20 % lower than that observed during the maximum of solar cycle 23. The dynamics of the irregularities throughout a solar cycle, as investigated from the estimates of the mean zonal drift velocities, presented a good correlation with the EUV and F10.7 cm solar fluxes. Meanwhile, the seasonal behavior showed that the magnitude of the zonal drift velocities is larger during the December solstice months than during the equinoxes. In terms of modeling, the results for the α − µ distribution fit quite well with the experimental data and with the temporal characteristics of fading events independently of the solar activity level.

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Section: Ionospheric Irregularity Zonal Drift Velocitiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Climatology and modeling of ionospheric scintillations and irregularity zonal drifts at the equatorial anomaly crest region

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“…20,2011 corresponds to a decrease in the carrier to noise ratio of GPS signal down to 16.5 dB, which can be caused by ionospheric scintillation. The signal can be degraded by more than 20 dB for strong scintillation (Kil et al 2000).…”

Section: Effects Of Non-uniform Pseudorange Error For One Satellitementioning

confidence: 99%

Characteristics of GPS positioning error with non-uniform pseudorange error

Fan

2014

GPS Solut

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We study the characteristics of the random GPS positioning errors when the pseudorange errors differ for each satellite. A concise, explicit, analytical formula is derived for the covariance of the positioning error by using singular value decomposition. It is composed of a uniform error covariance together with additional contributions from those satellites with larger pseudorange errors. The eigenvectors of the uniform error covariance define the principal directions of the 4-dimensional error ellipsoid, and the eigenvalues are the squares of the semi-axes. The additional part from individual satellites has only one eigenvector and one eigenvalue. This makes the error ellipsoid enlarge mainly along a direction related to both the overall satellite geometry and the position of the specific satellites. The theory is validated by simulating the GPS constellation and pseudorange measurements. The random positioning error is examined while any one or more pseudorange errors are increased. Horizontal positioning error distributions are presented to demonstrate the variations of the orientation and size of the error ellipses with the pseudorange error of a specific satellite. The results show that the analytical formula describes the positioning error accurately.

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“…[25] Works about GPS scintillations in Sã o Luís and Cachoeira Paulista make only brief comments about storm effects [e.g, Kil et al, 2000;Rodrigues et al, 2004]. BONELLI: GPS SCINTILLATION 6 of 9 S09D05 W W W. ag u .…”

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confidence: 99%

Space Weather Quarterly Volume 5, Issue 4, 2008

2008

Space Weather Quarterly

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Global Positioning System measurements of the ionospheric zonal apparent velocity at Cachoeira Paulista in Brazil

Cited by 78 publications

References 38 publications

Climatology and modeling of ionospheric scintillations and irregularity zonal drifts at the equatorial anomaly crest region

Climatology and modeling of ionospheric scintillations and irregularity zonal drifts at the equatorial anomaly crest region

Characteristics of GPS positioning error with non-uniform pseudorange error

Space Weather Quarterly Volume 5, Issue 4, 2008

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