A preliminary experimental test of ionospheric tomography

Pryse, S. E.; Kersley, L.

doi:10.1016/0021-9169(92)90067-u

Cited by 99 publications

(61 citation statements)

References 4 publications

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“…EISCAT has played a vital role in the development of ionospheric tomography by providing independent observations of electron density in a region at auroral latitudes where the horizontal structuring of the ionosphere on a scale of tens to hundreds of kilometres is well suited to imaging by the tomographic method. Pryse and Kersley (1992) reported the first independent verification of a tomographic image using electron-density measurements provided by the EISCAT radar. Whilst this represented a rudimentary initial test of the potential application of tomographic techniques to…”

Section: Introductionmentioning

confidence: 99%

EISCAT verification in the development of ionospheric tomography

et al. 1996

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Abstract. This paper highlights the important role played by the EISCAT radar for verification in the development of tomographic techniques to produce images of ionospheric electron density. A brief review is given of some of the stages in the application of tomographic reconstruction techniques to the ionosphere. Results are presented to illustrate the effectiveness of the method in imaging ionospheric structures at high latitudes. In addition, the results include the first tomographic image of the ionosphere for a region extending from mid-latitudes over mainland Scandinavia to high latitudes above Svalbard.

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Section: Introductionmentioning

confidence: 99%

EISCAT verification in the development of ionospheric tomography

et al. 1996

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“…Reconstruction of the ionosphere by computerized tomography is first studied by Austen et al (1988) using the Algebraic Reconstruction Technique (ART) which provides a 2-D reconstruction of the ionosphere. One of the first application of ART is performed by Pryse and Kersley (1992). A major group of studies use Abel Inversion Technique in the reconstruction (Hajj and Romans, 1998;Tsai et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Tomographic reconstruction of the ionospheric electron density as a function of space and time

Erturk

Arıkan

2009

Advances in Space Research

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Electron density distribution is the major determining parameter of the ionosphere. Computerized Ionospheric Tomography (CIT) is a method to reconstruct ionospheric electron density image by computing Total Electron Content (TEC) values from the recorded Global Positioning Satellite System (GPS) signals. Due to the multi-scale variability of the ionosphere and inherent biases and errors in the computation of TEC, CIT constitutes an underdetermined ill-posed inverse problem. In this study, a novel Singular Value Decomposition (SVD) based CIT reconstruction technique is proposed for the imaging of electron density in both space (latitude, longitude, altitude) and time. The underlying model is obtained from International Reference Ionosphere (IRI) and the necessary measurements are obtained from earth based and satellite based GPS recordings. Based on the IRI-2007 model, a basis is formed by SVD for the required location and the time of interest. Selecting the first few basis vectors corresponding to the most significant singular values, the 3-D CIT is formulated as a weighted least squares estimation problem of the basis coefficients. By providing significant regularization to the tomographic inversion problem with limited projections, the proposed technique provides robust and reliable 3-D reconstructions of ionospheric electron density.

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“…Satellite radio tomography for measuring the ionospheric electron density was suggested by Austen et al, (1986), and it has later been developed in a great number of papers (e.g. Austen et al, 1988;Raymund et al, 1990;Andreeva et al, 1992;Fremouw et al, 1992;Kunitsyn and Tereshchenko, 1992;Pryse and Kersley, 1992;Pryse et al, 1993;Markkanen et al, 1995;NygreÂ n et al, 1996b). The method has now reached a level which allows its use in ionospheric research (Mitchell et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Application of tomographic inversion in studying airglow in the mesopause region

Nygrén

Taylor

Lehtinen³

et al. 1998

Ann. Geophys.

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Abstract. It is pointed out that observations of periodic nightglow structures give excellent information on atmospheric gravity waves in the mesosphere and lower thermosphere. The periods, the horizontal wavelengths and the phase speeds of the waves can be determined from airglow images and, using several cameras, the approximate altitude of the luminous layer can also be determined by triangulation. In this paper the possibility of applying tomographic methods for reconstructing the airglow structures is investigated using numerical simulations. A ground-based chain of cameras is assumed, two-dimensional airglow models in the vertical plane above the chain are constructed, and simulated data are calculated by integrating the models along a great number of rays with di erent elevation angles for each camera. After addition of random noise, these data are then inverted to obtain reconstructions of the models. A tomographic analysis package originally designed for satellite radiotomography is used in the inversion. The package is based on a formulation of stochastic inversion which allows the input of a priori information to the solver in terms of regularization variances. The reconstruction is carried out in two stages. In the ®rst inversion, constant regularization variances are used within a wide altitude range. The results are used in determining the approximate altitude range of the airglow structures. Then, in the second inversion, constant non-zero regularization variances are used inside this region and zero variances outside it. With this method reliable reconstructions of the models are obtained. The number of cameras as well as their separations are varied in order to ®nd out the limitations of the method.

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A preliminary experimental test of ionospheric tomography

Cited by 99 publications

References 4 publications

EISCAT verification in the development of ionospheric tomography

EISCAT verification in the development of ionospheric tomography

Tomographic reconstruction of the ionospheric electron density as a function of space and time

Application of tomographic inversion in studying airglow in the mesopause region

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