Power spectra of ionospheric scintillations

Singleton, D. G.

doi:10.1016/0021-9169(74)90071-3

Cited by 60 publications

(31 citation statements)

References 13 publications

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“…Ever since, there have been a large number of power spectral studies of amplitude scintillations monitored in different parts of the globe [Singleton, 1974;Crane, 1976;Umeki et al, 1977;Fremouw et al, 1978;Franke and Liu, 1983;Bhattacharyya and Rastogi, 1985;Basu et al, 1988].…”

Section: Introductionmentioning

confidence: 99%

Investigating high‐latitude ionospheric turbulence using global positioning system data

Mezaoui

Hamza

Jayachandran

2014

Geophysical Research Letters

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Statistical properties of the amplitude and phase of GPS L1 signals sampled at 50 Hz are investigated to understand the turbulent behavior of the polar region ionosphere. Wavelet detrended amplitude and phase data are used to construct the probability distribution function (PDF) of the amplitude and phase fluctuations of the signal. Turbulent behavior of the ionosphere is quantified using the skewness and kurtosis of the PDF. It is found that these two independent moments are related through a parabolic relationship, which was also reported in the case of turbulent neutral fluids and turbulent laboratory plasmas.

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Section: Introductionmentioning

confidence: 99%

Investigating high‐latitude ionospheric turbulence using global positioning system data

Mezaoui

Hamza

Jayachandran

2014

Geophysical Research Letters

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“…The theoretical models generally depend upon an assumption about the shape of the power spectrum of electron density fluctuations along the path. Thus observations of power spectrum of electron density have been of interest to some scholars [3,[5][6][7][8][9], with many excellent reviews on this subject being published. Using VHF beaconing, Basu [10] found that the scintillation power spectra index is from 3 to 4.5 near the equatorial region, and the irregularity scale is less than 1 km.…”

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confidence: 99%

Spectra of L-band ionospheric scintillation over Nanjing

Fang

Yang

Sicheng³

2012

Chin. Sci. Bull.

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We report the spatiotemporal statistical characteristics of amplitude scintillation over Nanjing. A FFT method for computing scintillation intensity power spectra is briefly described. Using this method, the data with ISATM in Nanjing is analyzed. Spectra characteristic is presented and the irregularities property is discussed preliminarily. The results reveal that the power spectra obtained for Nanjing is consistent with theoretical modeling. At frequencies below the Fresnel frequency, the power density plotted on log-log scale is almost constant whereas above it asymptotes to a straight line. The spectral index ranges from 1.71 to 1.92, which has positive correlation with the S 4 index. Finally, the average drift velocity of irregularities is computed assumably and compared with that obtained for Xinxiang and Haikou. ionospheric scintillation, scintillation power spectra, electronic density irregularity, spectra index Citation:Fang H X, Yang S G, Wang S C. Spectra of L-band ionospheric scintillation over Nanjing. Chin Sci Bull, 2012, 57: 33753380, doi: 10.1007/s11434-012-5365-yThe ionosphere often features irregularities resulting from various unstable turbulence processes. When a radio wave from an extraterrestrial source, such as an artificial satellite, passes through the ionosphere, its wavefront will be distorted by the inhomogeneity present in the ionospheric plasma. As a result, the amplitude and phase of signals fluctuate, and the scintillation can be observed [1]. On propagating to the ground, these amplitude and phase variations cause interference to occur resulting in a diffraction pattern.Severe scintillations negatively affect trans-ionospheric radio communications and can interrupt or degrade GPS receiver operation by causing fading of the in-phase and quadrature signals, making the determination of phase by a tracking loop impossible. Degradation occurs when phase scintillations increase the frequency of cycle slips on the phase, and thus introduce ranging errors which in turn increase the dilution of precision and reduce the accuracy of GPS navigation. Since ionospheric scintillation originates from random electron density irregularities acting as wave scatterers, research on the formation and evolution of irregularities is closely related to scintillation studies [2]. A large number of theoretical investigations and statistical results have shown that the spectral analysis of scintillations from discrete radio sources and artificial satellites provides a new and valuable technique for investigating the continuous spectrum of small scale electron density irregularities in the ionosphere [3]. Information about irregularities in velocity, the equivalent thickness of the scattering layer, and irregularities in electron density can be deduced using conventional diffraction theory [4]. Also, knowledge of these irregularites is important in understanding the physical mechanisms underlying their formation and evolution; this is crucial in scintillation modeling [2]. During the past few decades, theor...

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“…Using VHF spaced-aerial measurements, the drift velocity of the irregularities were found to be westward and lying within a range of 28-45 m s −1 during the above time interval. The power spectrum of amplitude scintillations showed signatures of Fresnel oscillations, indicating that the irregularity layer was very thin (Singleton, 1974). The scintillation patches may probably be attributed to Sporadic E layer.…”

Section: Datamentioning

confidence: 95%

Response of the equatorial ionosphere to the total solar eclipse of 22 July 2009 and annular eclipse of 15 January 2010 as observed from a network of stations situated in the Indian longitude sector

et al. 2011

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Abstract. Dual-frequency GPS TEC monitors have been used to study the response of the ionosphere to the solar eclipses of 22 July 2009 and 15 January 2010. The receivers were located at three stations, Calcutta, Kharagpur and Baharampore which are situated outside the umbra zone in the Indian longitude sector with each baseline being ∼200 km. Effects of obscuration of the solar disc were noted in the ambient TEC recorded at the three stations. A series of depletions in TEC along the track of a GPS satellite and associated wave-like structures were identified on some GPS links during both the eclipses.

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Power spectra of ionospheric scintillations

Cited by 60 publications

References 13 publications

Investigating high‐latitude ionospheric turbulence using global positioning system data

Investigating high‐latitude ionospheric turbulence using global positioning system data

Spectra of L-band ionospheric scintillation over Nanjing

Response of the equatorial ionosphere to the total solar eclipse of 22 July 2009 and annular eclipse of 15 January 2010 as observed from a network of stations situated in the Indian longitude sector

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