著者

関根 征士

出版者

一般社団法人 照明学会

雑誌

照明学会誌 (ISSN:00192341)

巻号頁・発行日

vol.71, no.6, pp.333-338, 1987-06-01 (Released:2011-07-19)

参考文献数

11

被引用文献数

3 8

---

The clear sky light is generated through the process that the direct sunlight is successively scattered by the air and aerosol in the turbid atmosphere and repeatedly reflected by the earth's surface.The scattering-transmitting functions of the direct sunlight and the reflected light from the earth's surface were set up theoretically and the spectral power distributions of the clear sky light were estimeted.It became clear how following factors effect the change of the clear sky light respectively.(1) The scattering light by the air and that by the aerosol.(2) The first scattering light and the higher order scattering light than the first.(3) The reflected light from the earth's surface.

著者

関根 征士

出版者

一般社団法人 照明学会

雑誌

照明学会誌 (ISSN:00192341)

巻号頁・発行日

vol.79, no.2, pp.57-65, 1995-02-01 (Released:2011-07-19)

参考文献数

20

---

Daylight is composed of direct sunlight and skylight. Skylight is direct sunlight and light reflected from the earth's surface that have been scattered by the atmosphere and clouds. The correlated color temperature (CCT) of daylight varies hourly, and the CCT of skylight varies extensively due to changes in the spectral alvedo of the earth's surface, the solar altitude and the angular distance from the sun to a sky component, the atmospheric transmittance of visible radiation and the amount of cloud. This paper discusses causes of variations and local differences of skylight CCT and proposes a formula for skylight CCT as a function of cloud amount.

著者

関根 征士

出版者

一般社団法人 照明学会

雑誌

照明学会雑誌 (ISSN:00192341)

巻号頁・発行日

vol.63, no.3, pp.132-139, 1979-03-25 (Released:2011-07-19)

参考文献数

11

被引用文献数

2 2

著者

関根 征士

出版者

一般社団法人 照明学会

雑誌

照明学会誌 (ISSN:00192341)

巻号頁・発行日

vol.80, no.5, pp.354-363, 1996-05-01 (Released:2011-07-19)

参考文献数

28

---

The correlated color temperature (CCT) of total skylight, which comes to a horizontal plane from all sky components, varies hourly with atmospheric transmittance pv and the amount of cloud m. The parameter pvcaused by visible solar radiation is calculated from the atmospheric transmittance based on direct solar radiation. A new practical formula for estimating the CCT of the total skylight is proposed. Using the formula, the CCTs of the total skylight at 14 areas in Japan are calculated from the parameter pv and the number of days that is calculated from the parameter m. Consequently, it is estimated that variation in the CCT of daylight is 5900K to 8000K. The mean CCT of total skylight is 6800K, where the mean CCT of global light is 5900K and that of the total skylight for the parameter m=0 is 8000K.