ИСТИНА

Nowadays there are a few thousand high-orbital satellite receivers of GNSS (Global Navigational Satellite System), so methods of high-orbital radio tomography (HORT) are being developed rapidly. They allow obtaining 4D (spatio-temporal) distribution of the electron density in the ionosphere. In this work the results of F2-layer critical frequency comparison of high-orbital radio tomographic reconstruction with ionosondes data (as a primary control device of other methods of investigation of the ionosphere) are presented. This comparison was carried out for the region of North America and the region of Europe, as in these regions sufficient number of GPS receivers, required for obtaining electron density distribution, are located. Two temporal periods were investigated: the period of weak ionospheric disturbances and the period of strong geomagnetic storm.