Abstract
Disturbances due to a moving space vehicle in the ionospheric plasma have been investigated by means of accurate measurements of the electron density in rarefied wake regions, using a gyro-plasma probe. The vehicle wake structure of the K-9M-21 rocket in the ionosphere can be measured on its descent and has been investigated theoretically on the basis of the hydrodynamics of a quasi-neutral plasma. It is confirmed that the ionospheric plasma can be treated as a neutral gas for analysis of the vehicle wake by neglecting the effect of the local first-order electric field and the ambient geomagnetic field. The disturbance-free region which is important for the measurement of the undisturbed ambient plasma density is also discriminated clearly from the wake region surrounding the moving space vehicle.
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