Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...196..879i&link_type=abstract
Astrophysical Journal, vol. 196, Mar. 15, 1975, pt. 1, p. 879-882. Research supported by the University of Southern California;
Astronomy and Astrophysics
Astrophysics
3
Interplanetary Medium, Plasma Density, Plasma Diagnostics, Solar Wind Velocity, Extrapolation, Interplanetary Magnetic Fields, Pioneer 6 Space Probe, Proton Energy, Scintillation
Scientific paper
Direct observations from the plasma spectrometers on Pioneer 6 at 1 AU in December, 1965, have been used to obtain the power associated with fluctuations in the number density of solar-wind protons in the frequency range from .001 to .01 Hz. A power-law spectrum is obtained in this frequency range. The extension of the power-law density spectrum based on direct observations to these higher frequencies is consistent with previous extrapolations of both spacecraft and interplanetary scintillation observations and with the dominance of large-scale turbulence in the solar wind. This result is also consistent with direct observations of the solar-wind proton speed and the interplanetary magnetic field.
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