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Cover caption: From Figure 1 of Zakharenkova and Cherniak [DOI: 10.1002/2015SW001162 ]: Instruments involved in unique determination of topside ionosphere electron density profiles. (a) Schematic view of the instrument configuration; samples of the ionospheric electron density profiles derived from NeQuick model for conditions of 15 June 2010 at 06 LT (blue line) and 18 LT (red line) for (b) midlatitude and (c) equatorial points with coordinates (40°S, 15°E) and (0°E, 15°E) correspondingly; (d) altitudinal ranges contributed to Vertical Total Electron Content determination for each instrument. The dashed line show altitude of the Gravity field and steady‐state Ocean Circulation Explorer and TerraSAR‐X orbit. See pp. 271–285.