The solar wind density spectrum near the sun - Results from Voyager radio measurements

Details The solar wind density spectrum near the sun - Results from Voyager radio measurements The solar wind density spectrum near the sun - Results from Voyager radio measurements

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1745c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1745-1755. Research supported by the University of C

Astronomy and Astrophysics

Astronomy

54

Radio Wave Refraction, Solar Flux Density, Solar Spectra, Solar Wind, Power Spectra, Radio Jets (Astronomy), Voyager 1 Spacecraft, Voyager 2 Spacecraft

Scientific paper

Spacecraft radio propagation data are analyzed to estimate the solar wind density fluctuation power spectrum across five decades of spatial wave number. The data were from radio science observations made during superior conjunctions of the Voyager 1 and Voyager 2 spacecrafts in 1979 and 1980. These data were analyzed to yield the wave structure function, a statistic which is related to, but obtained more readily than, the spectrum itself. Structure functions were obtained from a total of 28 observations spanning the heliocentric distance range 7-22 solar radii. The composite structure functions tend to be steep (approximately Kolmogorov) at large scales and nearly always show some flattening at smaller scales (10-100 km). The inflection between the steep and flatter regions is abrupt and occurs at scales of 100-300 km. These results are in excellent agreement with the spectral shape model proposed by Coles and Harmon (1989).

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