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@@ -44,7 +44,7 @@ When processing the signal received from satellites, there are so-called "natura
 
 [Ionospheric and tropospheric error](Ionospheric%20and%20tropospheric%20error)
 
-The **ionosphere** is an envelope of charged particles (ions) that surrounds the Earth at an **altitude of about 20 km.** The carrier wave of the GNSS signal must penetrate this layer on its way. The fact that **this layer is not neutral in terms of its charge** causes a **disturbance in the speed** **of the propagating electromagnetic wave.** The time taken by the GNSS wave is modified by an unknown amount of time, called the ionospheric delay. The evaluation of the distance between the satellite and the station will be distorted. **Similarly,** the **propagation time of the GNSS wave is affected by the water vapour content** of the lower layer of the atmosphere (0 to 10 km altitude): **the troposphere.**
+The **ionosphere** extends from **60 km altitude to 1000 km altitude.** The carrier wave of the GNSS signal must penetrate this layer on its way. The fact that **this layer is not neutral in terms of its charge** causes a **disturbance in the speed** **of the propagating electromagnetic wave.** The time taken by the GNSS wave is modified by an unknown amount of time, called the ionospheric delay. The evaluation of the distance between the satellite and the station will be distorted. **Similarly,** the **propagation time of the GNSS wave is affected by the water vapour content** of the lower layer of the atmosphere (0 to 10 km altitude): **the troposphere.**
 
 [Orbital errors](Orbital%20errors)