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-20 -15 -10 -5 0 5 10 15 20 ecliptic latitude(degree)

Figure 2. The result of model fitting in case of i = 2°.2andfi = 53°. The six pairs from top to bottom are the profiles in the heliocentric longitude of A — Ae = 55°, 60°, 65°, 70°, 100° and 115°, respectively.

The resulting values of i and fi are not completely compatible with the invariable plane(i = 1°.6, fi = 107°) of the solar system and the orbital plane of Venus(i = 3°.4, fi = 76°.7). They agree in i with the previous results deduced from the Helios data [1] and Tenerife data [3], but significantly differ in fi. The previous results, e.g. [1] and [3], came from the data averaged over the observations in a different season, while we used a snapshot obtained in December. Therefore, this discrepancy in fi may suggest a complex structure of the zodiacal clouds. Further observations from the ground-based site in a different season will reveal the spatial distribution of zodiacal cloud more detail.

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