Physics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..483g&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 12, Aug. 1985, p. 483-486.
Physics
39
Boundary Layer Plasmas, Broadband, Electrostatic Waves, Geomagnetic Tail, Plasma Sheaths, Electron Energy, Ion Beams, Magnetic Fields, Plasma Frequencies, Wave Propagation
Scientific paper
The theory of the generation of broadband electrostatic noise (BEN) in the magnetotail is extended through numerical solution of the dispersion relation under conditions that exist in the plasma sheet boundary layer. It is found that the low-frequency portion of the spectrum has a broad angular spectrum but a fairly sharp peak near 75 deg with respect to the magnetic field, while the high-frequency portion has a narrower angular spectrum that is strongly concentrated along the magnetic field line. These results are in excellent agreement with observations of the broadband wave spectrum and a recent measurement of the propagation direction. The effect of a second cold component of electrons is analyzed, and it is found that it can increase the upper cutoff frequency of BEN to the observed value at about the plasma frequency.
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