Abstract
Observed TEC values during the disturbances cannot be adequately reproduced by integrating available model electron density profile along the ionospheric heights. It is shown that TEC and NmF2 disturbances do not coincide for ∼ 50% of days (enhanced TEC with normal NmF2 or reduced NmF2 with normal TEC). In such cases presence of an additional layer between the bottomside and topside ionosphere is assumed; its thickness may range from zero to 300 km. Available ionospheric models should be revised inserting broad peak of ionization.
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Gulyaeva, T.L. TEC Residual Slab-Thickness between Bottomside and Topside Ionosphere. Acta Geod. Geoph. Hung 32, 355–363 (1997). https://doi.org/10.1007/BF03325506
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DOI: https://doi.org/10.1007/BF03325506