Last Modified on 22 August, 2007

- Sky radiometer Information -




- What is the SKYNET Project? -

SKYNET Project is a grass roots effort to make a network to measurethe atmospheric radiation and related atmospheric parameters to help the analysis. BSRN and GAW are the international networks useful for SKYNET to learn how to select and set the instruments for radiative flux measurements. NASA AERONET is another network for SKYNET to be coordinated for performing sun/sky brightness measurements. We have a support from Japan Science and Technology Corporation (JST)/APEX project ( http://duckbill.ccsr.u-tokyo.ac.jp/index.php), National Space and Development Agency of Japan (NASDA)/GLI project ( http://suzaku.eorc.jaxa.jp/GLI/), and others.

SKYNET instrumentation has been designed to be effective for comprehensive understanding the transfer process of the atmospheric radiation. Therefore, the minimal instrumentation should be sun/sky photometer (hereafter we call such instrument as skyradiometer) and uplooking shortwave radiative flux meter (hereafter pyranometer) to study downward showtwave flux in the clear sky condition. More comprehensive instrumentation should be downlooking pyranometer and up/down looking longwave radaitive flux meter (hereafter pyrgeometer, though this definition is not exactly correct), and lidar. Dual frequency microwave radiometer and Skyview camera are useful for characterizing the cloud condition. Aerosol sampling is desirable for investigating the relationship between the clear sky flux and aerosol loading and properties. A routine sonde measurement site should be close to the SKYNET site for obtaining meteorological element profiles. To clear the cost issue, SKYNET has two categories depending on the degree of instrumentation, i.e. super sites and basic sites. The super sites should be fully implemented with instruments useful for the SKYNET objectives. The basic sites should have the minimal instruments, i.e., skyradiometer and pyranometer. Each site should have a site scientist who controls the instrument condition and data logging. The data are transferred to the SKYNET data center at the Chiba University (T. Takamura, director) and are processed for retrieving high level products, such as calibrated radiative flux, aerosol optical thickness and size distribution. To protect the right of the involved scientists to maintain the sites by the grass roots effort, but to maximize the benefit of the research community from SKYNET activity, SKYNET solicits users and site scientists to accept the SKYNET data policy under which the retrieved data sets are utilized for non-profitable research activities. Anyone can join SKYNET if they accept the objectives, instrumentation method, and the data policy.

- About SKYNET Data Policy -

Participants, collaborators, and data users are encouraged to follow the data policy
for making the SKYNET system healthy and most contributory to the research community.

  1. Data users have to get permission from the data owners for data use in publication.
    Way of courtesy, i.e., co-authorship or acknowledge in the acknowledgments, is subject to the discussion between the data user and data owner.
  2. Data users should acknowledge SKYNET project in the acknowledgments.
  3. Data owners(*) can share all the data and software generated by the SKYNET project.
  4. Data owners should release the data taken at the SKYNET site they administrate to the SKYNET data center at earliest timing.
  5. Data owners have to release the data to public within one and half years.

    *; Data owner(s) : main contributor(s) for each data to be observed and pre-processed.

- About sky radiometer analysis software -

SKYRAD.pack is a software package for sky radiometer data to obtain aresol optical properties (ex. Aerosol optical thickness, Angstrom exponent, Single scattering albedo, Size distribution of Volume, and etc).

This package has been developed for analyses of observation data measured on ground and/or on ship by sky radiometers (POM-01, POM-02, POM-01MKII) made of PREDE Co., Ltd. (Tokyo, Japan).

Analysis of sky radiometer data is performed by SKYRAD.PACK developed by Prof. Teruyuki Nakajima (CCSR, The University of Tokyo, Japan), and is opened to the public through OpenCLASTR. SKYRAD.PACK has two verisions (version 3 and 4.2) currently used in the regular analysis.

If you have any questions and/or comments about this package, please contact Kazuma AOKI.


- About sky radiometer operation software -

# Operation software of sky radiometer
If you have any questions and/or comments about this software, please contact PREDE Co., Ltd. and/or Kazuma AOKI.

Download of operation software: PREDE Program Download web page

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