Abstract
The relaxation sounder uses the characteristics of the propagation of radiowaves to sound the plasma surrounding the spacecraft. It determines, in particular, the plasma frequency, which gives the electron density.
We have now measurements over the whole dayside of the magnetosphere, from the evening to the night sectors.
The behaviour of the plasma resonance depends on local time, the nightime echoes being generally weaker.
Density measurements thus obtained are shown and discussed in the context of what is presently known about the plasma distribution in the magnetosphere. In particular, the density around apogee is studied as a function of magnetic activity. On the dayside, it appears to vary between a few and a few tens of electrons per cubic centimeter. The evolution of the density profile for several consecutive days is studied and interpreted tracing back the drift of the particles.
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Etcheto, J., Bloch, J.J. (1978). Plasma Density Measurements from the GEOS-1 Relaxation Sounder. In: Knott, K., Durney, A., Ogilvie, K. (eds) Advances in Magnetosperic Physics with GEOS-1 and ISEE. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-9527-7_19
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DOI: https://doi.org/10.1007/978-94-009-9527-7_19
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