Particle acceleration parallel and perpendicular to the magnetic field observed by DE-2

Details Particle acceleration parallel and perpendicular to the magnetic field observed by DE-2 Particle acceleration parallel and perpendicular to the magnetic field observed by DE-2

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.3893h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, June 1, 1984, p. 3893-3902, 3983, 3984.

Computer Science

Sound

64

Geomagnetism, Ionospheric Sounding, Particle Acceleration, Satellite Observation, Space Plasmas, Electric Fields, Energy Spectra, Field Aligned Currents, High Energy Electrons, Ion Motion, Temporal Distribution

Scientific paper

Observations by the instrument payload on DE-2 have been used to study the plasma and electrodynamic properties of the ionosphere when field-aligned currents approaching 100 microA/sq m flow at about 900-km altitude. In such a situation, it is found that the thermal ions may account for a substantial fraction of the current carriers and that the bulk of the energetic electron population has undergone a net acceleration of a few hundred electron volts. Large amplitude electrostatic waves that have a maximum near 100 Hz and an energetic ion population that shows evidence for both parallel and perpendicular acceleration to about 30 eV also accompany such events. The horizontal thermal ion drift (electric field) that accompanies these plasma phenomena has extremely large gradients over small spatial scales. Such a signature is consistent with a requirement for a large field-aligned current, and a limit to the available field-aligned potential difference that may be applied to the plasma.

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