Polarization of low-frequency electromagnetic radiation in the lobes of Jupiter's magnetotail

Details Polarization of low-frequency electromagnetic radiation in the lobes of Jupiter's magnetotail Polarization of low-frequency electromagnetic radiation in the lobes of Jupiter's magnetotail

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.4701m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, May 1, 1987, p. 4701-4705.

Physics

12

Geomagnetic Tail, Jupiter Atmosphere, Low Frequencies, Plasma Waves, Polarized Electromagnetic Radiation, Narrowband, Plasma Density, Plasma Frequencies, Satellite-Borne Instruments, Voyager 1 Spacecraft, Jupiter, Magnetotail, Polarization, Electromagnetic Waves, Density, Pws, Radiation, Modulation, Amplitude, Plasma Waves, Frequencies, Whistlers, Spacecraft Observations, Resonance, Energy, Plasma Wave Subsystem, Voyager Missions, Analysis, Calculations

Scientific paper

The plasma wave instruments on the Voyager spacecraft have detected intense electromagnetic radiation within the lobes of Jupiter's magnetic tail down to the lowest frequency of the detector (10 Hz). During a yaw maneuver performed by Voyager 1 in the lobe of the Jovian magnetotail, a modulation appeared in the amplitudes of waves detected in the 10-, 17.8- and 31.1-Hz channels of the plasma wave analyzer, well below the local electron cyclotron frequency of 260 Hz. The lowest amplitudes occurred when the antenna axis was most nearly parallel to the magnetic field. Wave amplitudes in the 56.2-Hz and higher frequency channels remained nearly constant during the maneuver. From the cold-plasma theory of electromagnetic waves, it is concluded that the plasma frequency was between the 56.2- and 31.1-Hz channels where the parallel-polarized component of the spectrum cuts off. This implies a tail-lobe density between 0.000032 and 0.000015/cu cm. The left-hand cutoff frequency would then be below 10 Hz, consistent with either the Z-mode (L, X) or whistlers (R-mode) in the modulated channels.

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