Letter | Published:

Change in Rotation Period of Jupiter's Decameter Radio Sources

Naturevolume 199pages10801081 (1963) | Download Citation



THE hypothesis that Jupiter's decameter radio sources may have a constant period has been widely accepted since its initial independent suggestion by Gallet1 and by Burke2. Estimates of this period have been made by many observers1–8, and no significant departures from the adopted mean period (System III (1957.0)—9h 55m 29.37s) have been established. Upper limits of ± 2s to yearly fluctuations and of ± 1s to slow secular changes over an eleven-year period, 1950–61, were set by Douglas7,8 and Douglas and Smith9. The apparent constancy of the rotation period, together with a constant difference in longitude between the three apparent activity regions, has supported the hypothesis that the radio sources are related to the non-gaseous body of the planet, perhaps through Jupiter's magnetic field.

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  1. 1

    Gallet, R., Trans. Inst. Rad. Eng., on Antennas and Propagation (Astrophys., 5, 327, 1957).

  2. 2

    Burke, B. F., Carnegie Inst. Wash. Yearbook, No. 56, 90 (1957).

  3. 3

    Shain, C. A., Austral. J. Phys., 9, 61 (1956).

  4. 4

    Carr, T. D., Smith, A. G., Pepple, R., and Barrow, C. H., Astrophys. J., 127, 274 (1958).

  5. 5

    Franklin, K. L., and Burke, B. F., J. Geophys. Res., 63, 807 (1958).

  6. 6

    Gardner, F. F., and Shain, C. A., Austral. J. Phys., 11, 55 (1958).

  7. 7

    Douglas, J. N., thesis, Yale University (1960).

  8. 8

    Douglas, J. N., Astron. J., 67, 574 (Abst.) (1962).

  9. 9

    Douglas, J. N., and Smith, H. J., La Physique des Planètes, Mem. Soc. Roy. Sci. Liège (1963).

  10. 10

    Hide, R., Nature, 190, 895 (1961); Physique des Planètes, Mem. Soc. Roy. Sci. Liège, 481 (1963).

  11. 11

    Gallet, R., Planets and Satellites, edit. by Kuiper, G., and Middlehurst, B., Univ. of Chicago Press, Chicago (1961).

  12. 12

    Field, G. B. (private communication).

  13. 13

    Carr, T. D., Smith, A. G., Bollhagen, H., Six, jun., N. F., and Chatterton, N. E., Astrophys. J., 134, 105 (1961).

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  1. Yale University Observatory, New Haven, Conn.

    •  & HARLAN J. SMITH


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