Journal
ASTRONOMY & ASTROPHYSICS
Volume 439, Issue 3, Pages 1165-1169Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20042614
Keywords
sun : corona; sun : solar wind; turbulence
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Radio occultation observations of the solar corona at solar offset distances of 12.8-36.9 R-S were performed from December of 2000 to January of 2001, using the Nozomi spacecraft (Planet-B) of Japan. Phase scintillation spectra up to the frequency of similar to 10 Hz were obtained in two-way mode with S-band uplink and X-band downlink. The spectra cannot be represented by a single power law especially for small offset distances. That is, at low frequencies (large scales) the spectra show slopes indicative of Kolmogorov, a local flattening occurs from similar to 0.5 Hz (scale similar to 600 km) to similar to 3 Hz (similar to 100 km), and a steepening occurs again at higher frequencies. This three-component nature of the spectrum was observed with a single method for the first time, although the spectral shape is variable and the three-component feature is not always evident.
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