Physics
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983m%26p....28..125v&link_type=abstract
Moon and the Planets (ISSN 0165-0807), vol. 28, April 1983, p. 125-136.
Physics
7
Annual Variations, Insolation, Mars (Planet), Orbital Elements, Solar Orbits, Solar Planetary Interactions, Celestial Mechanics, Diurnal Variations, Eccentricity, Mars Atmosphere, Obliqueness, Orbit Perturbation, Perihelions
Scientific paper
Attention is given to changes in the mean seasonal insolations on the planet Mars caused by significant large-scale variations in the eccentricity, the obliquity, and the longitude of perihelion. Three orbital configurations are investigated. In the first, the eccentricity is successively 0, 0.075, and 0.15; the present values are used for the obliquity and the longitude of perihelion, respectively 25 deg and 250 deg. In the second configuration, the obliquity is 15, 25, and 35 deg for a circular orbit, with the longitude of perihelion being 250 deg. In the third configuration, the eccentricity is 0.075; the obliquity is 25 deg; and the longitude of perihelion is -90, 0, and 90 deg. Although long-term periodic oscillations of the eccentricity (first case) and the longitude of perihelion (third case) produce, respectively, very small variations or no variation at all in the average yearly insolation, fluctuations of the above planetary data are found to strongly affect the mean summer and winter daily insolations. Indeed, the calculations reveal that between the two extreme values of the orbital elements used, the seasonal insolations show a change in amplitude of about 15 to 20 percent difference over the entire altitude interval.
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