Observations and analysis of ionospheric drift

Yerg, Donald G.

doi:10.1016/0021-9169(56)90130-1

Cited by 27 publications

(2 citation statements)

References 3 publications

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“…A fading record can be considered to be the sum total of a number of sinusoidal waves of different frequencies with some phase difference relative to each other. All the conventional methods of analyzing the spaced receiver drift records are based on one tacit assumption that all the Fourier components in the ground diffraction pattern move with the same velocity [Mitra, 1949;Briggs et al, 1950;Phillips and Spencer, 1955;Piitter, 1955;Yerg, 1956;Banerji, '1956;and Fooks, 1965]. Jones and Maude [1965] •determined the apparent velocities for the individual Fourier components using the basic method of Mitra [1949] and showed that on certain occasions this assumption was definitely invalid.…”

Section: Introductionmentioning

confidence: 99%

Dispersive motions in the equatorial ionosphere

Misra¹

1974

Radio Science

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The results of the dispersion analysis of the spaced receiver records of fading for an equatorial station in the Indian zone are discussed. It is shown that the apparent drift speed increases almost linearly with the frequency of fading in all the cases studied for both the E and F regions. The dispersion of drift speed is larger for the F region than for the E region in general. Furthermore, the F region shows a larger dispersion during the daytime whereas it is of the same order in the day and nighttimes for the E region. The drift speed corresponding to the highest Fourier frequency present in a particular record is found to be close to the apparent drift speed V• as determined from the shift of the peak of cross correllograms while the total frequency spread of the speed is linearly related to the random drift speed Vc derived by the full correlation armlysis.Several possible causes of dispersion in the ionosphere such as gravity waves, independently moving reflecting screens, height gradient of the horizontal drift and size of irregularities, the dispersive nature of the vertical drift velocity, and the variability of the drift during the course of record are discussed. Interference of the signals reflected from two or more highly aspects•nsitive areas in the ionosphere is suggested as a possible mechanism resulting in the positive and linear dispersion observed on the ground at an equatorial station.

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Section: Introductionmentioning

confidence: 99%

Dispersive motions in the equatorial ionosphere

Misra¹

1974

Radio Science

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“…Fooks [1965] proposed a few modifications of this merhod wherein an independent determination of the axes of the ellipse was made possible. Yerg [1956] proposed a simplified version of the correlation technique of analysis such that only six values of the correlation coefficients are required for the determination of all the drift parameters of the ground diffraction pattern.…”

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On the validity and comparison of various methods of analysis of ionospheric drift records for an equatorial station

Misra¹

1974

J. Geophys. Res.

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A few closely spaced receiver ionospheric drift records for an equatorial station in the Indian zone (Thumba, 0.6øS dip) are subjected to various methods of analysis proposed by different workers from time to time. It is shown that the modified time delay method of Bamgboye et al. offers a good substitute for the full correlation analysis for an equatorial station like Thumba when a complete knowledge of the ground diffraction pattern is to be derived from the time shifts alone. The methods proposed by POtter and Banerji are not applicable to an equatorial station owing to the extreme elongation of the irregularities in the magnetic north-south direction. The variant 2 method results for both V and V•. show a close correspondence with those of the full correlation analysis even for regions of extreme anisotropy like Thumba. The ionospheric drift records obtained by the closely spaced receiver technique are most commonly analyzed by the similar fades method [Mitra, 1949]. Pt•tter [1955] pointed out that in the absence of random velocities, the time shifts tx and tv are related by a straight line called Piitter's line. This, line enables the determination of the drift velocities from a smaller number of maximums and can be used even for an anisotropic pattern, which does not change its shape as it moves. Banertl [1960] modified this technique so that it could be used for a turbulent anisotropic pattern by using the results of Briggs and Spencer [1955] and making a suitable transformation of the coordinate system. This method requires a large number of time lags in order to get a good fit of the observed distribu-150 IOO SPEED IN M/S ß ß ß // ß ß e ß r;•.' //ß ß /e ß

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Measurement of ionospheric drift at Ahmedabad from fading patterns of reflections on 2·6 and 4·0 Mc./s. (23° 02′ N; 72° 38′ E)

Sethuraman

1958

Proc. Indian Acad. Sci.

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Observations and analysis of ionospheric drift

Cited by 27 publications

References 3 publications

Dispersive motions in the equatorial ionosphere

Dispersive motions in the equatorial ionosphere

On the validity and comparison of various methods of analysis of ionospheric drift records for an equatorial station

Measurement of ionospheric drift at Ahmedabad from fading patterns of reflections on 2·6 and 4·0 Mc./s. (23° 02′ N; 72° 38′ E)

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