Ion acoustic waves in the solar wind

Details Ion acoustic waves in the solar wind Ion acoustic waves in the solar wind

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83...58g&link_type=abstract

Journal of Geophysical Research, vol. 83, Jan. 1, 1978, p. 58-74. Navy-supported research;

Physics

44

Electric Field Strength, Ion Acoustic Waves, Plasma Waves, Solar Wind, Bow Waves, Explorer 43 Satellite, Helios 1, Helios 2, Plasma Oscillations, Shock Waves, Very Low Frequencies

Scientific paper

Plasma wave measurements on the Helios 1 and 2 spacecraft have revealed the occurrence of electric field turbulence in the solar wind at frequencies between the electron and ion plasma frequencies. Wavelength measurements with the Imp 6 spacecraft now provide strong evidence that these waves are shortwavelength ion acoustic waves which are Doppler-shifted upward in frequency by the motion of the solar wind. Comparison of the Helios results with measurements from the earth-orbiting Imp 6 and 8 spacecraft shows that the ion acoustic wave turbulence detected in interplanetary space has characteristics essentially identical to those of bursts of electrostatic turbulence generated by protons streaming into the solar wind from the earth's bow shock. In a few cases, enhanced ion acoustic wave intensities have been observed in direct association with abrupt increases in the anisotropy of the solar wind electron distribution. This relationship strongly suggests that the ion acoustic waves detected by Helios far from the earth are produced by an electron heat flux instability, as was suggested by Forslund. Possible related mechanisms which could explain the generation of ion acoustic waves by protons streaming into the solar wind from the earth's bow shock are also considered.

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