Evolution of Near-Sun Solar Wind Turbulence

Details Evolution of Near-Sun Solar Wind Turbulence Evolution of Near-Sun Solar Wind Turbulence

2009-04-19

arxiv.org/abs/0904.2900v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

8 pages, 5 figures, To appear in "Magnetic Coupling between the Interior and the Atmosphere of the Sun", eds. S.S. Hasan and R

Scientific paper

This paper presents a preliminary analysis of the turbulence spectrum of the solar wind in the near-Sun region R < 50 Rs, obtained from interplanetary scintillation measurements with the Ooty Radio Telescope at 327 MHz. The results clearly show that the scintillation is dominated by density irregularities of size about 100 - 500 km. The scintillation at the small-scale side of the spectrum, although significantly less in magnitude, has a flatter spectrum than the larger-scale dominant part. Furthermore, the spectral power contained in the flatter portion rapidly increases closer to the Sun. These results on the turbulence spectrum for R < 50 Rs quantify the evidence for radial evolution of the small-scale fluctuations (

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