Some features of the small-scale solar wind fluctuations

Details Some features of the small-scale solar wind fluctuations Some features of the small-scale solar wind fluctuations

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.confq..82z&link_type=abstract

Institute of Space Research, International Solar Wind 8 Conference, p. 82

Other

Solar Wind, Spectrum Analysis, Interplanetary Medium, Power Spectra, Time Series Analysis, Wavelet Analysis, Space Plasmas, Solar Wind Velocity, Prognoz Satellites, Temporal Resolution, Frequency Ranges, Kolmogorov Theory, Bow Waves, Shock Waves, Ionic Mobility, Flux (Rate)

Scientific paper

We have investigated small-scale variations of the solar wind ion flux measured with Faraday cups onboard the Prognoz-8 satellite. These measurements have a high time resolution of 1.24 seconds for intervals with a duration of several hours and as high as 0.02 seconds for some periods of about 1 hour duration. The main goal of this work is the determination of the quantitative features of fast ion flux fluctuations using mainly spectral analysis but also other methods. We also identify their association with interplanetary plasma parameters. Particularly, it is shown that the slope of the power spectra in the frequency range from 1E-4 to 6E-2 Hz is close to the classical Kolmogorov (-5/3) law. We also discuss some intervals with a very high level of the relative amplitude of flux fluctuations (10-20 percent) which were observed near the Earth's bow shock in the foreshock region. The use of the wavelet method for the long time series allows us to study the temporal evolution of power spectra.

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