Data download information
This site is members only. Sky radiometer measurements of the direct and diffuse solar radiation provide information to calculate the aerosol optical thickness, Angstrom exponent, single scattering albedo, size distribution of volume and etc. Data have been analyzed by an inversion software called SKYRAD.pack (Nakajima et al. 1996). Available version and quality levels are SKYRAD.pack 4.2 (Level 0, 1G, and 2G). Version 4.2 can retrieve the single scattering albedo at each wavelength.

Data format
V42L0: Quasi-real time data for SKYRAD.pack Version 4.2 (until 30 degree)
V42L1G: SKYRAD.pack Version 4.2 (until 30 degree)
V42L2G: GOSAT version, Quality-assured data for SKYRAD.pack Version 4.2 (full angle)

+ Version 4.2 Level-1G (V42L1G): V42L1G can retrieve the aerosol optical thickness, Angstrom exponent and size distribution . We used until 30 degree.

ex) BRE_V42L1G_200904.txt
No Y M D H Lon Lat Day(LT) Alpha T400 T500 T675 T870 T1020
2 2009 4 1 8.85 8.850 53.104 5.3688 1.132 0.838 0.632 0.443 0.335 0.293
..............................

No,Y,M,D,H: No, Year, Month, Day, Hour (ex. 10:30; 10.50)
Lon,Lat,Day(LT): Longitude, Latitude, Day(Local time, ex. 6 Dec 10:30; 6.4375)
Alpha: Angstrom exponent (used 5 wavelength: T400,T500,T675,T870,T1020)
T400,T500,T675,T870,T1020: Aerosol optical thickness at each wavelength

+ Version 4.2 Level-2G (V42L2G): V42L2G can retrieve the aerosol optical thickness, Angstrom exponent, single scattering albedo and size distribution. We used full observation angles. This version can derive the wavelength dependent single scattering albedo.

ex) BRE_V42L2G_200904.txt
No Y M D H Lon Lat Day(LT) Alpha T400 T500 T675 T870 T1020 S400 S500 S675 S870 S1020
2 2009 4 1 8.85 8.850 53.104 5.3750 0.783 0.358 0.297 0.231 0.191 0.173 0.984 0.984 0.984 0.984 0.985
..............................

No,Y,M,D,H: No, Year, Month, Day, Hour (ex. 10:30; 10.50)
Lon,Lat,Day(LT): Longitude, Latitude, Day(Local time, ex. 6 Dec 10:30; 6.4375)
Alpha: Angstrom exponent (used 5 wavelength: T400,T500,T675,T870,T1020)
T400,T500,T675,T870,T1020: Aerosol optical thickness at each wavelength
S400,S500,S675,S870,S1020: Single scattering albedo at each wavelength

+ Version 4.2 Level-2Ga and 2Gb (V42L2Ga & 2Gb): Instrument calibration, cloud-screened and quality-assured data.

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.