The spectrum of electron density fluctuations in the solar wind and its variations with solar wind speed

Details The spectrum of electron density fluctuations in the solar wind and its variations with solar wind speed The spectrum of electron density fluctuations in the solar wind and its variations with solar wind speed

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9923411m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A12, p. 23,411-23,420

Other

22

Electron Density Profiles, Interplanetary Magnetic Fields, Power Spectra, Scintillation, Solar Cycles, Solar Wind, Solar Wind Velocity, Radio Telescopes, Solar Corpuscular Radiation

Scientific paper

We describe simultaneous interplanetary scintillation (IPS) measurements for the solar distance range 70-185 solar radii made using the Ooty Radio Telescope and the Solar Terrestrial Environment Laboratory three-antenna system during the first half of the current solar cycle 22. These measurements have been used to establish the spectral characteristics of the electron density fluctuations in the solar wind, and we study the relation of these to the plasma flow speed. At times of low activity, for high-speed streams (VSW approximately 60 km/sec) the spectra (sensitive to the IPS temporal frequency range 1-10 Hz) are steep, with a power law exponent alpha approximately 3.8. During high levels of activity for high-speed streams, the spectra are less steep with alpha approximately 3.4. In the low-speed wind (VSW approximately 400 km/sec) the spectra are clearly flatter, alpha approximately 2.9, and nearly invariant with solar activity. The average shape of the spectrum obtained from this study is consistent with results obtained via other techniques. By combining the present estimates with earlier spacecraft data, it is possible to consider the shape of the density fluctuation spectrum in the frequency range 10-5-101 Hz. It is shown that the spectrum has different slopes in different spectral domains and is well described by a three-component model as proposed by Coles and Harmon (1989). Moreover, the high-frequency components of the spectra in the low-and high-speed streams involve different spatial frequency ranges.

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