Artificial electron and ion beam effects: Active Plasma Experiment

Details Artificial electron and ion beam effects: Active Plasma Experiment Artificial electron and ion beam effects: Active Plasma Experiment

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...102.2201n&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue A2, p. 2201-2212

Physics

Plasma Physics

13

Ionosphere: Active Experiments, Space Plasma Physics: Active Perturbation Experiments, Space Plasma Physics: Charged Particle Motion And Acceleration, Space Plasma Physics: Kinetic And Mhd Theory

Scientific paper

The Active Plasma Experiment uses intensive electron beam emission for the study of dynamic processes in the magnetosphere and upper ionosphere. The beam energy and current are as high as 8 keV and 100 mA and the pitch angle of the emission varies in the range from 50° to 80°. The basic cycle of electron injection is formed by current pulses of different duration, intensity, and frequency. The spacecraft potential is balanced by a low-energy xenon plasma generator during the electron beam injection. The spacecraft potential is measured by the floating probe, and the response of the environment is studied by the charged particle spectrometer working in the energy range from 0.05 to 25 keV. During the neutral or ionized Xe release without the electron gun operation the spacecraft potential remains nearly unchanged and the observed energy spectra of charged particles do not exhibit the presence of any acceleration process. The spacecraft potential during electron beam emission does not exceed 50 V if the Xe plasma or the neutral gas was released together with the electrons. The electron gun firing creates a disturbance which produces a broad spectrum of energetic electrons extending up to 1.5 keV. The acceleration process can be explained by the introduction of the electric field with intensity of about 100 V/m. This intensity is in agreement with the observed E×B drift velocity. The spatial extent of the disturbance is established to be tens of meters.

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