ASHIKAGA, JAPAN

Contacts: Prof. Masato Oki Ashikaga Institute of Thechnology Ohmae Ashikaga, Tochigi 326, Japan Tel : (81) 28 462 0605 Fax : (81) 28 462 4235 E-mail : Server :	Station Location: Ashikaga, Japan. Latitude: 36°21' N Longitude: 139°24' E Height above sea level: 59 m. Local Time: GMT+9 Code: JPN9 Type: Research class. Operation: Started on January 1991.
Topographic map showing the land within a 5 km radius of the station location

ASHIKAGA, JAPAN

Site surroundings: Ashikaga is located 80 km north-west of Tokyo. Within a 5km radius of the station, about 60% is urban housing and shops with roads and about 40% is hillside. The Watarase river flows through Ashikaga west to east. The motorway route No 50 is 2 km from the measurement site.	Climate characteristics: Climate is relatively mild, but from winter to early spring a biting seasonal wind blows from the north-west mountains. Average number of clear days is 63 in a year. The average temperature in January is 3.2 °C and in July 24.6 °C. The average annual temperature is 14.2°C. The annual sunshine duration is 2100 hours. The closest weather station is located at Kumagaya, 27 km south-west of Ashikaga.
Map showing the immediate surroundings of the station

ASHIKAGA, JAPAN

Sampling Interval: 1 mn. (30 mn for sky scans) Recording Interval: 1 mn. (30 mn for sky scans) Illuminances: Global horizontal: EKO ML-010S Diffuse horizontal: EKO ML-010S North vertical: Takachiho-sangyo DAM East vertical: Takachiho-sangyo DAM South vertical: Takachiho-sangyo DAM West vertical: Takachiho-sangyo DAM Direct normal: EKO ML-010SD Irradiances: Global horizontal: EKO MS-801 Diffuse horizontal: EKO MS-42 Direct normal: EKO MS-52 Others: Sky luminances: EKO MS-300 Sky radiances: EKO MS-300 UV-A: EKO MS-140 UV-B: EKO MS-210W Shadow band specifications: Diffuse illuminance: radius: 25.0 cm / width: 5.0 cm Diffuse irradiance: radius: 20.0 cm / width: 7.0 cm

Station map Obstruction for the global horizontal illuminance sensor

Comments The vertical illuminance sensors are shaded from ground reflected light using black semi-circle sheet and were calibrated by the Minolta Illuminometer in March 1990. The interface and A/D convert devices, etc. for the vertical illuminance sensors are set in the air-conditioned wooden box just under the transparent dome. All other sensors wre calibrated by Eko Instrument Co. in 1990. The skyscanner was calibrated by Eko Instrument Co. in autumn 1992 and was set in Nov. 1992 with sky radiance sensor.

ASHIKAGA, JAPAN

View 1 of the station	Comments A view of the station looking east including from left to right the vertical illuminance sensors under the plastic dome, the diffuse illuminance and irradiance sensors on their solar tracking mount, and the sky scanner.
View 2 of the station	Comments View of the station looking north including from left to right the sky scanner, the diffuse illuminance and irradiance sensors on their solar tracking mount, the direct irradiance and illuminance sensors, and the vertical illuminance sensors in the plastic dome. The UV-A and UV-B sensors are set on the left a little far from the dome.

ASHIKAGA, JAPAN

Important modifications made to the acquisition system, recording interval modification, time during which the station was not operating...

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