Continuum radiation and electron plasma oscillations in the distant geomagnetic tail

Details Continuum radiation and electron plasma oscillations in the distant geomagnetic tail Continuum radiation and electron plasma oscillations in the distant geomagnetic tail

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..661c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 11, July 1984, p. 661-664.

Physics

16

Continuous Radiation, Electron Plasma, Geomagnetic Tail, Plasma Oscillations, Space Plasmas, Angular Distribution, Electric Fields, International Sun Earth Explorer 3, Kilometric Waves, Magnetosheath, Power Spectra

Scientific paper

ISEE-3 electric field measurements are used to examine the properties of electromagnetic continuum radiation in the distant geomagnetic tail. Continuum is observed in all the tail's plasma regions and in the magnetosheath. The power spectrum at 210 R sub E is nearly identical to that at 40 R sub E, indicating that the tail cavity forms a reasonably loss-free waveguide. The angular distribution exhibits both anisotropy, which is similar to that observed nearer the earth, and isotropy for high frequencies (greater than 31.6 kHz) in the magnetosheath and for low frequencies (equal to or less than 17.8 kHz) in the tail lobes and boundary layer. Isotropic radiation suggests that, in addition to the near earth source, continuum is also generated over a large spatial region in the tail. Electrostatic electron plasma oscillations are also detected in the distant tail, and these could represent the local source of the continuum.

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