THE FOUNDMENTAL STUDY ON THE TROPICAL NIGHTβ

Abstract

 In this paper, the authors focused on the tropical night for 24 years in 12 spots of Japan. We defined the tropical night as 13 hours from 6pm to the next 6am. And we compared the daily minimum temperature(instantaneous) with the minimum temperature(hourly mean value) in the tropical night. And we research on the time of the minimum temperature in the tropical night.
 As a result, we found that the most interrelated the minimum temperature in the tropical night is the almost equal to the next daily mean temperature, and time of the minimum temperature is from 4am to 6am in a day.