The calibrated irradiance data files are in the following format:

Column 1: day of year 1997 (GMT time) (1998 is day of year + 365)
Column 2: channel 1 (412 nm)
Column 3: channel 2 (443 nm)
Column 4: channel 3 (490 nm)
Column 5: channel 4 ( 511 nm or 700 nm)
Column 6: channel 5 (555 nm)
Column 7: channel 6 (665 nm)
Column 8: channel 7 (683 nm)

The calibration files have the following format:

Rows 1-14: header lines
Rows 15-28: calibration values
Rows 29-34: header lines

An example set of calibration values from one of these files is shown below:

ED 411.7 'uW/cm^2/nm' 2 BU 1 OPTIC2
17.3 2.8992e-003 1.52

The first number, 411.7, is the center wavelength of that channel.  The appropriate units for the calibrated channel are shown in quotes (uW/cm^2/nm).  The calibrated dark value (counts) is the first number on the second line (17.3).  The next number (2.8992e-003) is the calibration factor (F) to convert units of counts to irradiance (uW/cm^2/nm).  The final number (1.52) is the immersion correction (Im).  There are seven pairs of lines in this format, one for each channel.  The appropriate equation for converting raw (count) irradiance values to irradiance values in units of uW/cm^2/nm is:

Ed(calibrated) = [Ed(counts)-dark(counts)] * F * Im.

Note that the data presented here have already been calibrated and do not need to have these corrections applied.  The calibration files are included here for completeness.

Webpage by Jasmine S. Bartlett, Oregon State University.