Coronal occultation of Voyager 2, 1979 August

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Abstract
Simultaneous observations of the angular and spectral broadening of Voyager 2 radio signals at λ.13.1 cm have been performed during superior conjunction, when the line of sight to the spacecraft passed within 2.1R⊙ of the Sun's north pole, and have been used to derive solar wind speeds. The measured angular broadening ϕ follows the trend established by other workers from observations of natural radio sources at solar maximum and at larger separations from the photosphere, as well as from observations of a single spacecraft at smaller separation. Representatively, ϕ was 0.26 arcmin at a separation of 2.9R⊙. It is suggested that the scattering observed is sufficient at solar maximum to account for the fact that solar ‘plasma-frequency’ radio bursts in ground-based observations appear to occur well above the plasma-frequency level.

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