Radio Frequency Fluctuation Spectra During the Solar Conjunctions of the Ulysses and Galileo Spacecraft |
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Authors: | Wohlmuth R Plettemeier D Edenhofer P Bird MK Efimov AI Andreev VE Samoznaev LN Chashei IV |
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Institution: | (1) Institut für HF-Technik, Univ. Bochum, Bochum, Germany;(2) Radioastronomisches Institut, Univ. Bonn, Bonn, Germany;(3) Inst. Radio Engineering & Electronics, Russian Acad. Sciences, Moscow, Russia;(4) Lebedev Physical Institute, Russian Acad. Sciences, Moscow, Russia |
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Abstract: | Temporal power spectra have been computed from recordings of the downlink frequency fluctuations of the Galileo and Ulysses radio signals during their solar conjunctions. Both the equatorial streamer belt and the polar coronal holes were investigated
over a range of ray path solar offset distances from 4 to 80 R⊙. By combining gapless data from successive tracking passes, Doppler scintillation power spectra could be computed down to
extremely low frequencies. Some spectra feature a low-frequency turnover at frequencies around 0.1 mHz that could be interpreted
as an outer scale of density turbulence in the coronal plasma.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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