Earth Planets Space, Vol. 50 (Nos. 6, 7), pp. 501-505, 1998
S. M. Kwon1 and S. S. Hong2
1Department of Science Education, Kangwon National University, Chunchon, Korea
2Department of Astronomy, Seoul National University, Seoul, Korea
(Received December 8, 1997; Revised April 9, 1998; Accepted April 13, 1998)
Abstract: We have calculated the brightness of zodiacal emission by using the three dimensional optical models of zodiacal cloud. By comparing the calculated brightness distribution with the IRASobservations, we found that the cosine model is the best out of the three for describing the helioecliptic latitude dependence of dust distribution. We also found best parameters for the heliocentric variations of the dust temperature and volumetric absorption cross-section. Inclination and ascending node of the symmetry plane were deduced from annual variations of i) the peak offset latitude and ii) the pole brightness difference. Longitudes of the ascending node derived from i) and ii) are shown to be significantly different from each other.