Abstract
The well-defined zones of central meridian longitude within which the probability of jovian radio emission at frequencies near 22 MHz is relatively high are known as sources A, B and C. Each consists of a component for which the emission probability is strongly correlated with Io's orbital position, and another component that is Io-unrelated1. This emission anisotropy and other observed effects have long been interpreted in terms of quasi-continuous beams that co-rotate with the inner jovian magnetosphere. Observations made from the Soviet spacecraft Mars 7 and the Nancay Observatory2 provided more direct evidence for beaming; activity observed from one of the stations was not detectable from the other. We now present convincing evidence based on concurrent observations from the two Voyager spacecraft and a terrestrial observatory that the component of source A radiation that is not correlated with Io's position is generally emitted in co-rotating ‘searchlight beams’ of distinctive cross-sectional shape.
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References
Carr, T. D., Desch, M. D. & Alexander, J. K. in Physics of the Jovian Magnetosphere (ed. Dessler, A. J.) 226–284 (Cambridge University Press, 1983).
Poquerusse, M. & Lecacheux, A. Nature 275, 111–113 (1978).
Warwick, J. W. et al. Science 206, 991–995 (1979).
Leblanc, Y. J. geophys. Res. 86, 8564–8568 (1981).
Acuna, M. H. & Ness, N. F. J. geophys. Res. 81, 2917–2922 (1976).
Gulkis, S. & Carr, T. D. Science 154, 257–259 (1966).
Register, H. I. & Smith, A. G. Astrophys. Lett. 3, 209–213 (1969).
Carr, T. D., Smith, A. G., Donivan, F. F. & Register, H. I. Radio Source 5, 495–503 (1970).
Bozyan, F. A. & Douglas, J. N. J. geophys. Res. 81, 3387–3392 (1976).
Barrow, C. H. Astr. Astrophys. 101, 142–149 (1981).
Goldstein, M. L. & Thieman, J. R. J. geophys. Res. 86, 8569–8578 (1981).
Pearce, J. B. J. geophys. Res. 86, 8579–8580 (1981).
Staelin, D. H. J. geophys. Res. 86, 8581–8584 (1981).
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Maeda, K., Carr, T. Beam structure of Jupiter's decametric radiation. Nature 308, 166–169 (1984). https://doi.org/10.1038/308166a0
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DOI: https://doi.org/10.1038/308166a0
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