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High-resolution spectrograms of ion acoustic waves in the solar windHigh-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.
Document ID
19790061935
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kurth, W. S.
(Iowa Univ. Iowa City, IA, United States)
Gurnett, D. A.
(Iowa, University Iowa City, Iowa, United States)
Scarf, F. L.
(Iowa, University Iowa City, Iowa; TRW Defense and Space Systems Group, Redondo Beach, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
July 1, 1979
Publication Information
Publication: Journal of Geophysical Research
Volume: 84
Subject Category
Solar Physics
Report/Patent Number
AD-A075845
Accession Number
79A45948
Funding Number(s)
CONTRACT_GRANT: NGL-16-001-043
CONTRACT_GRANT: NAS1-13129
CONTRACT_GRANT: JPL-954012
CONTRACT_GRANT: JPL-954013
Distribution Limits
Public
Copyright
Other

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