Physics
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.3413k&link_type=abstract
Journal of Geophysical Research, vol. 84, July 1, 1979, p. 3413-3419. Navy-supported research;
Physics
12
High Resolution, Ion Acoustic Waves, Satellite-Borne Instruments, Solar Wind, Spectrograms, Electron Plasma, Electrostatic Waves, Interplanetary Gas, Plasma Frequencies, Voyager Project
Scientific paper
High-resolution, frequency-time spectrograms of ion acoustic waves in the solar wind obtained by the Voyager spacecraft at distances of up to 1.7 AU are examined. The plasma wave instrument on board the Voyager spacecraft used to acquire the spectra employs an electric dipole antenna with a 16-channel step frequency receiver and a high-bit-rate waveform receiver to detect and measure the electric field of plasma waves. Voyager spectrograms show that the ion acoustic waves consist of narrowband, rapidly varying bursts, lasting a few seconds or less, usually in the range between the plasma ion and electron frequencies. Spectrograms taken at 1.7 AU are shown to be essentially identical to similar measurements taken upstream of the earth's magnetosphere, which are produced by suprathermal protons streaming into the solar wind from the bow shock, and to those taken upstream of interplanetary shocks.
Gurnett Donald A.
Kurth Willaim S.
Scarf Frederick L.
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