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.
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.