Physics
Scientific paper
Oct 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974jgr....79.4179s&link_type=abstract
Journal of Geophysical Research, vol. 79, Oct. 1, 1974, p. 4179-4185.
Physics
1
Pioneer 9 Space Probe, Plasma Waves, Solar Storms, Solar Wind, Collisionless Plasmas, Interplanetary Medium, Ion Acoustic Waves, Magnetohydrodynamic Stability, Satellite-Borne Instruments, Solar Protons
Scientific paper
The solar disturbances of August 1972 produced large-scale solar wind perturbations that were detected by the Pioneer 9 plasma probe, electric field detector, and magnetometer for an extended time period commencing early on August 3. During this ten-day interval the interplanetary plasma parameters at r approximately equal 0.8 AU varied over unusually wide ranges, so that the conditions for generation of high and low VLF wave levels could be identified fairly readily. It is demonstrated that no measurable signals were detected in the broadband electric field channel (sensitive to waves with f greater than or equal to 100 Hz in the spacecraft frame of reference) unless the proton density was high enough to yield a proton plasma frequency with f greater than or about equal to 100 Hz. The analysis suggests that waves related to ion acoustic oscillations were detected throughout the extended storm period.
Scarf Frederick L.
Wolfe John H.
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