The equivalent slab thickness is a measure of the width of the shape of the vertical electron density profile of the ionosphere. The equivalent slab thickness is defined by the ratio of the total electron content (TEC) and the peak electron density of the local ionosphere. To compute the peak electron density, vertical sounding data from different ionosonde stations are used. The corresponding TEC data are extracted from the SWACI TEC maps.

                                           Vertical Sounding Data supplied by University of Tromso

                                                  Vertical Sounding Data supplied by IAP Kühlungsborn

Vertical Sounding Data supplied by Ionospheric observatory Pruhonice of the Institute of Atmospheric Physics ASCR

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