Abstract The APEX project (Active Plasma Experiment) involves two spacecrafts moving along the same polar orbit (perigeum 440 km, apogeum 3080 km). The distance between these spacecrafts can be controlled in a wide range - from 1 to 1000 km, enabling a variety of two-point measurements. The principal feature of the experiment is an electron and ion gun, with variable parameters of injected beams, mounted on board the main satellite. Both objects are provided with fast ionelectron energy spectrometers having energy range from 50 eV to 30 keV. The spectrometers cover a full 4p of angular directions. This paper explains experimental possibilities offered by the APEX set-up, especially for the study of artificial disturbances created by the electron gun, and presents first results on the ion and electron distribution function measurements. The most interesting observation is a similarity between the undisturbed energy distribution in the polar region and that resulting from the electron beam-plasma interaction in lower latitudes.


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    Title :

    A behaviour of electron and ion energy and angular distribution during the active APEX experiment


    Contributors:
    Nemecek, Z. (author) / Safrankova, J. (author) / Prech, L. (author)

    Published in:

    Advances in Space Research ; 13 , 10 ; 113-116


    Publication date :

    1993-01-01


    Size :

    4 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



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