Determination of the vertical electron-density profile in ionospheric tomography: experimental results
The University of Wales, Aberystwyth, SY23 3BZ, UK Phone: +44 1970 62 28 21, Fax: +44 1970 62 28 26, e-mail: firstname.lastname@example.org
Abstract. The reconstruction of the vertical electron-density profile is a fundamental problem in ionospheric tomography. Lack of near-horizontal ray paths limits the information available on the vertical profile, so that the resultant image of electron density is biased in a horizontal sense. The vertical profile is of great importance as it affects the authenticity of the entire tomographic image. A new method is described whereby the vertical profile is selected using relative total-electron-content measurements. The new reconstruction process has been developed from modelling studies. A range of background ionospheres, representing many possible peak heights, scale heights and electron densities are formed from a Chapman profile on the bottomside with a range of topside profiles. The iterative reconstruction process is performed on all of these background ionospheres and a numerical selection criterion employed to select the final image. The resulting tomographic images show excellent agreement in electron density when compared with independent verification provided by the EISCAT radar.
Citation: Mitchell, C. N., Kersley, L., Heaton, J. A. T., and Pryse, S. E.: Determination of the vertical electron-density profile in ionospheric tomography: experimental results, Ann. Geophys., 15, 747-752, doi:10.1007/s00585-997-0747-1, 1997.