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

Němeček, Zdenek; Šafránková, Jana; Přech, Lubomír

doi:10.1016/0273-1177(93)90058-j

Cited by 10 publications

(3 citation statements)

References 6 publications

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“…for veriÐcation of realization of di †erent mechanisms of ion acceleration. These ions have been observed in [8] and their energy was of order or smaller than the beam energy (O8 keV). In experiment ""APEXÏÏ set of beam and background plasma parameters provides realization above stated mechanisms.…”

Section: Physica Scripta 57mentioning

confidence: 99%

Ion Acceleration in Collective Fields at Electron Beam Injection from Spacecraft

1998

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The phenomenon of plasma ion acceleration in the collective fields surrounding the spacecraft during electron beam injection into ionospheric plasmas at heights of about 200km is discussed. The ion acceleration results in the bombardment of a spacecraft surface with ions and high-energy atoms. At different conditions one of the following mechanisms of ion acceleration predominates: (1) in the field of vortex or nonmonotonous self-consistent potential jump, and (2) in the virtual cathode. High-energy atoms are produced due to the charge exchange of the accelerated ions or due to atom–ion collisions.

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Section: Physica Scripta 57mentioning

confidence: 99%

Ion Acceleration in Collective Fields at Electron Beam Injection from Spacecraft

1998

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“…The PEAS spectrometer consists of two identical sensor units, AP-I and AP-2, which cover two perpendicular planes in the velocity space. Each plane was divided into 12 sectors (with angular resolution of 22 x 5 degrees, more in Nemecek et al, 1993). The schematic drawing of the detector orientation is given in Fig.…”

Section: Active Experiments Facilitiesmentioning

confidence: 99%

“…We have studied only the events which took place at low and middle latitudes, as the electron and ion distributions disturbed by the electron beam emission are very similar to those observed in the particle precipitation regions (Nemecek et al, 1993) and one can hardly distinguish between these two populations. Based on the study of the energy and the angular distribution we have attempted to distinguish the different populations of the registered electron flow and to estimate the probable source of these particles.…”

Section: Introductionmentioning

confidence: 99%

Charged Particle Behaviour during the Active Phase of the APEX Experiment.

Němeček

Šafránková

Přech

1996

J. geomagn. geoelec

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The Active Plasma Experiment (APEX) uses intensive electron beam emission for the study of dynamic processes in the magnetosphere and upper ionosphere. The beam energy and current is 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 response of the environment is studied by the PEAS charged particle spectrometer working in the energy range 0.1-25 keV. The common response to the beam emission is the increase of the intensity of the registered electrons with energy less than 2 keV. Under some circumstances (the satellite position, the injector regime, the beam direction with respect to the magnetic field etc.), strong electron fluxes of the order of 107 cm 2sec IkeV-1 have been observed. The energy of these fluxes is in general a rising function of the mean current ofthe emitted beam but never exceeds the beam energy. The energy-angular distribution exhibits a complicated structure with the maximum energy located at the pitch angle which corresponds to that of the emitted electron beam.

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Response of the electron energy distribution to an artificially emitted electron beam: Apex experiment

Přech¹,

Němeček²,

Šafránková³

et al. 1995

Advances in Space Research

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

Cited by 10 publications

References 6 publications

Ion Acceleration in Collective Fields at Electron Beam Injection from Spacecraft

Ion Acceleration in Collective Fields at Electron Beam Injection from Spacecraft

Charged Particle Behaviour during the Active Phase of the APEX Experiment.

Response of the electron energy distribution to an artificially emitted electron beam: Apex experiment

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