[O-07] Poster presentations by senior high school students

[O07-P67] Research the View of Mt.Fuji with a Self-Made Observation Device

*Ryoo Niigawa¹, *Rin Takezoe¹ (1.Tokyo Metropolitan Tachikawa High School)

Keywords:Mt.Fuji, Visibility, Cap clouds, Apron clouds

The astronomy meteorology club at our school has been making meteorological observations including visibility for more than 70 years. Visibility is the maximum distance at which objects can be clearly seen with the naked eye, and has been used as an indicator of air pollution. 4 years ago, a senior started a study to analyze visibility observation data for the past 50 years. Last year, a senior developed a new visibility observation device that uses a camera controlled by a small computer to take pictures regularly.
In this study, we made a similar device to photograph around Mt. Fuji, and investigated the relationship between the view of Mt. Fuji and surrounding clouds and meteorological phenomena.
Analysis of past visual visibility observation data showed that the ratio of the number of days Mt. Fuji was visible per month was more than 50% in winter and less than 10% in summer.
The cloud characteristic of Mt. Fuji was noticed and analyzed from the photographing data for 6 months. As a result, most apron clouds occurred in midwinter, and they were associated with low temperatures at the top of Mt. Fuji. Cap clouds occurred three or four times a month, and they were associated with high humidity at the top of Mt. Fuji.