Spectral broadening of planetary radar signals by the solar wind

摘要: The microturbulence spectrum of the solar wind is estimated using spectral broadening planetary radar signals. Observations were made with two radars (12.6 cm and 70 cm) at Arecibo Observatory during 1979 1981 superior conjunctions Venus. These observations, which span distance range 5.4 to 25.5 R/sub sun/, are first their type be reported. data consistent earlier observations where comparisons can made. flattening high-frequency portion near Sun reported by Woo Armstrong confirmed. In one case clear evidence for an inner scale in vicinity 2 km found. Two transients, August 15 April 24-25, rather different characteristics observed.