Data Archive
Data is downloaded from the YESDAS to the
Sparc 1 station once every six hours using the connectivity program
xtty. After the data is downloaded, another software program
called callang converts the data to ASCII format. At the end of
the day, files from that day are combined and a Langley Analysis is attempted.
The data archive is text only. There are two directories containing
data. One has text files for every download that occurs. The other
has daily data files. In the main data archive, files are titled in
the form:
YYMMDD_HH:MM:SS.txt
where YYMMDD is the year, month and day of the data and HH:MM:SS is the
time that the data was downloaded from the radiometers. In the daily file
directory, the files are titled in the
form:
allYYMMDD.txt
where YYMMDD is the year, month and day of the file.
Please check the on-line log book for
information regarding the status of the instruments.
The raw data only begins to give insight into the atmospheric conditions
at the radiometer site. In order to make any conclusions about the
conditions of the atmosphere on any given day, or over a period of time,
the raw data must be analyzed. One simple analysis technique is to:
Graph the Data
Another useful technique for analyzing the data is to run a:
Langley Report
Looking at the data, the columns (from left to right) are:
- Date in Julian Time (number of days since January 1, 1900)
- Cosine of the Solar Zenith Angle
- Total Irradiance at all wavelengths(MFR-7) in W/m2/nm
- Total Irradiance at 415.6nm (MFR-7) in W/m2/nm
- Total Irradiance at 500.5nm (MFR-7) in W/m2/nm
- Total Irradiance at 616.6nm (MFR-7) in W/m2/nm
- Total Irradiance at 670.6nm (MFR-7) in W/m2/nm
- Total Irradiance at 868.8nm (MFR-7) in W/m2/nm
- Total Irradiance at 939.7nm (MFR-7) in W/m2/nm
- Diffuse Irradiance at all wavelengths (MFR-7) in W/m2/nm
- Diffuse Irradiance at 415.6nm (MFR-7) in W/m2/nm
- Diffuse Irradiance at 500.5nm (MFR-7) in W/m2/nm
- Diffuse Irradiance at 616.6nm (MFR-7) in W/m2/nm
- Diffuse Irradiance at 670.6nm (MFR-7) in W/m2/nm
- Diffuse Irradiance at 868.8nm (MFR-7) in W/m2/nm
- Diffuse Irradiance at 939.7nm (MFR-7) in W/m2/nm
- Direct Normal Irradiance at all wavelengths (MFR-7) in
W/m2/nm
- Direct Normal Irradiance at 415.6nm (MFR-7) in W/m2/nm
- Direct Normal Irradiance at 500.5nm (MFR-7) in W/m2/nm
- Direct Normal Irradiance at 616.6nm (MFR-7) in W/m2/nm
- Direct Normal Irradiance at 670.6nm (MFR-7) in W/m2/nm
- Direct Normal Irradiance at 868.8nm (MFR-7) in W/m2/nm
- Direct Normal Irradiance at 939.7nm (MFR-7) in W/m2/nm
- Direct Normal Irradiance at 311.8nm (SPUV) in W/m2/nm
- Direct Normal Irradiance at 326.1nm (SPUV) in W/m2/nm
- Direct Normal Irradiance at 368.4nm (SPUV) in W/m2/nm
- Direct Normal Irradiance at 416.5nm (SPUV) in W/m2/nm
- Direct Normal Irradiance at 502.3nm (SPUV) in W/m2/nm
- Direct Normal Irradiance at 616.5nm (SPUV) in W/m2/nm
- Temperature of the SPUV in Degrees Centigrade
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