Coronal occultation of Voyager 2, 1979 August
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 2.1 R ⊙ of the Sun's north pole, and have been used to derive solar wind speeds. The m...
| Published in: | Monthly Notices of the Royal Astronomical Society |
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| Main Authors: | , |
| Format: | Text |
| Language: | English |
| Published: |
Oxford University Press
1980
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| Subjects: | |
| Online Access: | http://mnras.oxfordjournals.org/cgi/content/short/190/1/73P https://doi.org/10.1093/mnras/190.1.73P |
| Summary: | 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 2.1 R ⊙ 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 2.9 R ⊙ . 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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