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Fig. SKYNET/skyradiometer site map. Sites with data available as of July 30, 2013 are shown in red.

Fig. Some photos taken during past SKYNET workshops. SKYNET workshops were held at Chiba(Japan) in July 2013, at Hefei(China) in September 2014, at Rome(Italy) in March 2016, and at New Delhi(India) in February 2019.

What is SKYNET ?

SKYNET is an observation network dedicated for aerosol-cloud-radiation interaction researches. It was initiated under the WCRP/GAME project and expanded focusing on East Asia as the ADEOS/GLI validation activity. The primary objectives of SKYNET are 1) to quantitatively evaluate long-term variations of aerosols, clouds, and atmospheric radiation and 2) to understand their effects on climate through aerosol-cloud-radiation interaction. In addition, the validation for satellite observations (e.g., GOSAT, GOSAT-2, GCOM-C, EarthCARE, and Himawari-8) as well as climate model simulations and data assimilations are also within the scope of the SKYNET activity. To accomplish these objectives, SKYNET observes optical and microphysical properties of aerosols and clouds and atmospheric radiation in worldwide under close collaboration among national agencies, institutes, and universities. All sites of SKYNET are equipped with one or more sky radiometers as the main instrument. To strengthen the ability of the SKYNET, simultaneous measurements with other instruments such as pyranometer, pyrgeometer, microwave radiometer, absorption meter, cloud camera, lidar, and MAX-DOAS are also conducted for some selected sites.

Other relevant SKYNET web sites

This is for the research product release service.

The relevant web sites are:
- ISDC (International SKYNET data center)
- Univ. of Toyoma (another research product service).
- ESR (European SKYNET Radiometer network)

The SKYNET-relevant activities at Chiba Univ. are conducted by:
- Air Quality & Sky Research (A-SKY) Laboratory (Irie laboratory)


  • Jun. 10, 2021: Ny-Alesund data are now available..
  • Oct. 20, 2020: The site "Cyprus" joined us.
  • Mar. 23, 2018: The site "Burgos (Philippines)" joined us.
  • Mar. 8, 2018: The site "Kofu (Japan)" joined us.
  • Dec. 13, 2017: The site "Rikubetsu (Japan)" joined us.
  • Sep. 1, 2017: Mirror sites for these web sites are now available at atmos2 and atmos3. The newer sites on atmos3 will only be available instead of atmos2.
  • Aug. 10, 2017: Sky radiometer observations resumed at Osaka, where a CIMEL sunphotometer is running.
  • Nov. 4, 2015: A CIMEL sunphotometer started its operation at the Chiba site.
  • Jun. 9, 2015: The site "Bangkok (Thailand)" joined us.
  • Apr. 28, 2015: Web sites for the IV International SKYNET Workshop have been launched.
  • Mar. 6, 2015: Sky radiometer observations restarted at Phimai.
  • Feb. 17, 2015: Created the link to the SKYNET special issue in JMSJ.
  • Feb. 4, 2015: The paper of Bi et al. (2014) received a JMSJ Award 2014.
  • Jan. 26, 2015: A tentative version of this web site was launched.