Abstract
IP WE have observed a significant anti-correlation between solar activity and the brightnesses of two Solar System objects. Both the planet Neptune and Saturn's satellite Titan increased in brightness by several per cent between 1972 and 19761 and subsequently became fainter by comparable amounts2. This period corresponds to the decline of solar activity at the end of solar cycle 20 (1972–76), followed by the rapid increase of activity at the beginning of cycle 21. Solar minimum and the maximum observed brightness of Titan and Neptune both occurred in 1976. (The maximum of cycle 21 is forecast for late 1979 or early 1980, with a sunspot number ∼1503.) We hypothesise that what we have observed are changes in planetary albedos induced by solar activity. Such changes may have an important bearing on the energy balances of the outer planets and their satellites.
Similar content being viewed by others
References
Lockwood, G. W. Science 190, 560–562 (1975); Icarus 32, 413–430 (1977).
Lockwood, G. W. & Thompson, D. T. Bull. Am. Astr. Soc. 10, 578 (1978).
Solar Geophysical Data, No. 409, Part I (Sept, 1978).
Andersson, L. E. in Planetary Satellites (ed. Burns, J. A.), 451 (University of Arizona Press, Tucson, 1977).
Lockwood, G. W. Astrophys. J. 195, L137–L139 (1975).
White, O. R. (ed.) The Solar Output and Its Variations Chs 1, 4 (Colorado Associated University Press, Boulder, 1977).
Hickey, J. R., Griffen, F. J. & Howell, H. B. Proc. International Solar Energy Society Solar World Conf. preprint (1977).
Chang, S., Scattergood, T., Aronowitz, S., & Flores, J. in The Saturn System (eds Hunten, D. M. & Morrison, D.) (NASA Conference Publication 2068, 1978).
Strobel, D. F. Rev. Geophys. Space Phys. 13, 372–382 (1975).
Intriligator, D. S. in Study of Travelling Interplanetary Phenomena 1977 (eds Shea, M. A., Smart, D. F. & Wu, S. T.) 195 ff (Reidel, Dordecht, 1977).
Smith, E. J. & Wolfe, J. H. in Study of Travelling Interplanetary Phenomena 1977 (eds Shea, M. A., Smart, D. F. & Wu, S. T.) 227–ff (Reidel, Dordrecht, 1977).
Lockwood, G. W. Icarus 35, 79–92 (1978).
Jerzykiewicz, M. & Serkowski, K. Lowell Obs. Bull. 6, 295–323 (1966).
Serkowski, K. Lowell Obs. Bull. 5, 157–226 (1961).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
LOCKWOOD, G., THOMPSON, D. A relationship between solar activity and planetary albedos. Nature 280, 43–45 (1979). https://doi.org/10.1038/280043a0
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1038/280043a0
- Springer Nature Limited