Determination of the vertical electron-density profile in ionospheric tomography: experimental results

Mitchell, C. N.; Kersley, L.; Heaton, J. A. T.; Pryse, S. E.

doi:10.1007/s005850050491

Cited by 22 publications

(24 citation statements)

References 7 publications

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“…Comparisons of tomographic reconstructions of ionospheric plasma distribution and EISCAT observations have been used to investigate several aspects of the technique. For example, they have con®rmed the ability of tomography to image latitudinally narrow features, such as a deep trough and associated boundary blob (Mitchell et al, 1995); have enabled the investigation of the ability of the reconstruction process to locate correctly the ionisation layer peak (Mitchell et al, 1997a); have allowed the assessment of the eect of number of ground receivers on an image (Mitchell et al, 1997b); and have enabled initial developments towards three-dimensional imaging of the ionosphere (Mitchell et al, 1997c).…”

Section: Introductionmentioning

confidence: 99%

The spatial structure of the dayside ionospheric trough

Pryse¹,

Kersley²,

Williams³

et al. 1998

Ann Geophysicae

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Abstract. Tomographic imaging provides a powerful technique for obtaining images of the spatial distribution of ionospheric electron density at polar latitudes. The method, which involves monitoring radio transmissions from the Navy Navigation Satellite System at a meridional chain of ground receivers, has particular potential for complementing temporal measurements by other observing techniques such as the EISCAT incoherent-scatter radar facility. Tomographic reconstructions are presented here from a two-week campaign in November 1995 that show large-scale structuring of the polar ionosphere. Measurements by the EISCAT radar con®rm the authenticity of the technique and provide additional information of the plasma electron and ion temperatures. The dayside trough, persistently observed at high latitudes during a geomagnetically quiet period but migrating to lower latitudes with increasing activity, is discussed in relationship to the pattern of the polarcap convection.

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Section: Introductionmentioning

confidence: 99%

The spatial structure of the dayside ionospheric trough

Pryse¹,

Kersley²,

Williams³

et al. 1998

Ann Geophysicae

Self Cite

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“…Second, all the equipment for a single receiving site is readily transportable, allowing the investigation of ionospheric regions to be readily extended to regions not currently covered by other methods. A third advantage of radio tomography is its wide area of coverage at a given time interval as long as there are enough receivers across the region of interest, whereas other methods (mentioned above) have a limited area of coverage as it is quite expensive to build networks to extend coverage (Mitchell et al, 1997). Furthermore, ground-based radar measurements are restricted to either the bottomside ionosphere (ionosondes) or the lower part of the topside ionosphere (usually below about 800 km), so only the tomographic technique using satellites in high altitude orbits (e.g.…”

Section: Tomographymentioning

confidence: 99%

Ionosphere dynamics over the Southern Hemisphere during the 31 March 2001 severe magnetic storm using multi-instrument measurement data

et al. 2005

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Abstract. The effects of the 31 March 2001 severe magnetic storm on the Southern Hemisphere ionosphere have been studied using ground-based and satellite measurements. The prime goal of this comprehensive study is to track the ionospheric response from high-to-low latitude to obtain a clear understanding of storm-time ionospheric change. The study uses a combination of ionospheric Total Electron Content (TEC) obtained from GPS signal group delay and phase advance measurements, ionosonde data, and data from satellite in-situ measurements, such as the Defense Metrological Satellite Program (DMSP), TOPographic EXplorer (TOPEX), and solar wind data from the Advanced Composition Explorer (ACE). A chain of Global Positioning System (GPS) stations near the 150 • E meridian has been used to give comprehensive latitude coverage extending from the cusp to the equatorial region. A tomographic inversion algorithm has been applied to the GPS TEC measurements to obtain maps of the latitudinal structure of the ionospheric during this severe magnetic storm period, enabling both the spatial and temporal response of the ionosphere to be studied. Analysis of data from several of the instruments indicates that a strong density enhancement occurred at mid-latitudes at 11:00 UT on 31 March 2001 and was followed by equatorward propagating large-scale Travelling Ionospheric Disturbances (TIDs). The tomographic reconstruction revealed important features in ionospheric structure, such as quasiwave formations extending finger-like to higher altitudes. The most pronounced ionospheric effects of the storm occurred at high-and mid-latitudes, where strong positive disturbances occurred during the storm main phase, followed by a long lasting negative storm effect during the recovery phase. Relatively minor storm effects occurred in the equatorial region.

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“…These results encouraged the further analysis and development of this method (Raymund et al 1993;Foster et al 1994;Mitchell et al 1997;Yin et al 2004;Yizengaw et al 2007;Strangeways et al 2009;Amerian et al 2010). Generally, the tomographic models can be categorized as function based models and voxel based models.…”

Section: Introductionmentioning

confidence: 94%

Development and analysis of 3D ionosphere modeling using base functions and GPS data over Iran

Razin

2015

Acta Geod Geophys

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In this study, a 3D-model of the electron density has been performed using the global positing system (GPS) measurements over Iran. 2D spherical harmonic functions and empirical orthogonal functions are used as base functions to model the horizontal and the vertical content of the electron density, respectively. The ionosonde data in Tehran (u = 35.7382°, k = 51.3851°) has been used for choosing an optimum value for the regularization parameter. To apply the method for constructing a 3D-image of the electron density, GPS measurements of the Iranian permanent GPS network (at 3-day in 2007) have been used. The instability of solution has been numerically analyzed and the Tikhonov method has been used for regularizing the solution. To come up with an optimum regularization parameter, the relative error in electron density profile computed from ionosonde measurements and their 3D model are minimized. The modeling region is between 24°to 40°N and 44°to 64°W. The result of 3D-Model has been compared to that of the international reference ionosphere model 2012 (IRI-2012). The data analysis shows that the latitudinal section of ionosphere electron density from 3D technique supports the expected time and height variations in ionosphere electron density. Moreover, these findings show that the height of maximum electron density is changed during the day and night and confirms the efficiency of multi-layer models in comparison to single-layer models. This method could recover 64-99 % of the ionosphere electron density.

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Determination of the vertical electron-density profile in ionospheric tomography: experimental results

Cited by 22 publications

References 7 publications

The spatial structure of the dayside ionospheric trough

The spatial structure of the dayside ionospheric trough

Ionosphere dynamics over the Southern Hemisphere during the 31 March 2001 severe magnetic storm using multi-instrument measurement data

Development and analysis of 3D ionosphere modeling using base functions and GPS data over Iran

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