believed to be published for the first time. Additional insolation data, such as daily insolation, can be further derived based on Table I and the above expressions. ACKNOWLEDGEMENTS We are very grateful to James B. Pollack from the Space Science Division, NASA Ames Research Center for supplying us with the f(z, t) table; to James E. Tillman from the Department of Atmospheric Sciences, University of Washington for supplying the ambient temperature distribution graphs; and for their informative discussions. This work was done while the author was a National Research Council—NASA Research Associate; on sabbatical leave from Tel Aviv University. REFERENCES [1] Pollack, J.B. et al. (1977) Properties of aerosols in the Martian atmosphere, as inferred from Viking Lander imaging data, Journal of Geographical Research, 82, pp. 4479-4496. [2] Pollack, J.B. et al. (1979) Properties and effects of dust particles suspended in the Martian atmosphere, Journal of Geographical Research, 84, No. B6, pp. 2929-2945. [3] Zurek, R.W. (1982) Martian great dust storms: an update, Icarus, 50, pp. 288-310. [4] Tillman, J.E., Director and N. C. Johnson Viking Computer Facility, Department of Atmospheric Sciences, University of Washington, Seattle, Washington [private communication]. [5] Pollack, J.B., Haberle, R.M., Schaeffer, J. & Lee, H. (1989) Simulation of the general circulation of the Martian atmosphere I: polar processes, J. Geophys. Res., in press. [6] Smith, E.v.P. & Jacobs, K.C. (1973) Introductory Astronomy and Astrophysics (San Francisco, W. B. Saunders).
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