University of Colorado at Boulder University of Colorado CU Home Search A to Z Index Map
Laboratory for Atmospheric and Space Physics

Level 3

SEE Level 3 Solar Irradiance Data

Download multiple days from the TIMED MDC

SEE L3 Calendar Access: Useful for finding data for a specific day.

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

L3 Data Directory– download any data file

SEE L3 Merged NetCDF file (single file) of the daily SEE L3 data products

Browse SEE Level 3 Data from LISIRD (spectra or time series)


Detailed Level 3 Description

README_SEE_L3_012.TXT – information for using SEE L3 data

SEE Level 3 data files contain one daily averaged solar irradiance spectrum in 1 nm intervals extracted from the EGS Level 2 and XPS Level 2 data products. Shortward of 27 nm, a solar model is scaled to match the XPS broadband data. SEE Level 3 data files also contain 38 emission lines extracted from EGS Level 2 spectra, and the XPS Level 2 diode irradiances.

For normal operations, SEE observes the Sun for about 3 minutes every orbit (97 minutes), which usually gives 14-15 measurements per day. The SEE Level 3 data are time averaged over the entire day, after applying corrections for atmospheric absorption, degradation, flare removal, and to 1-AU.


Reading the Data with IDL

With read_netcdf.pro individual data files may be read using an IDL command such as:

read_netcdf,'see__L3_2002044_012_01.ncdf',d,att

The data will then reside in the returned structure “d”, with each tag in the structure defined in the attributes array “att”.


 

SEE Level 3 Software


SEE Level 3 Solar Irradiance Data Format

Each data file contains an array of structures with 1 elements

L3_DATA         STRUCT    = ->  Array[1]

Each L3_DATA structure has the following form:

** Structure <277ba8>, 7 tags, length=4736, data length=4728, refs=1:
   DATE            LONG           2002039
   EGS_DEGRADE_MODEL
                   INT              0
   XPS_DEGRADE_MODEL
                   INT              0
   COR_1AU         FLOAT           1.02768
   SP              STRUCT    ->  Array[1]
   LINE            STRUCT    ->  Array[1]
   XPS             STRUCT    ->  Array[1]

Nested structure SP
** Structure <277f18>, 4 tags, length=3120, data length=3120, refs=2:
 WAVE FLOAT Array[195]

 FLUX FLOAT Array[195]

 ERR_TOT FLOAT Array[195]

 ERR_MEAS FLOAT Array[195]

 Nested structure LINE 
** Structure <2eb9d8>, 6 tags, length=1368, data length=1368, refs=2:

 WAVE FLOAT Array[38]

 FLUX FLOAT Array[38]

 ERR_TOT FLOAT Array[38]

 ERR_MEAS FLOAT Array[38]

 NAME STRING Array[38]

 LOGT FLOAT Array[38]

 Nested structure XPS_SF 
** Structure <277ab8>, 3 tags, length=12, data length=12, refs=2:

 QS FLOAT 1.00000

 AR FLOAT 0.204324

 FLARE FLOAT 0.00240766

 Nested structure XPS 
** Structure <2ebe48>, 7 tags, length=228, data length=228, refs=2:

 WAVE_XPS_1 FLOAT Array[9]

 WAVE_XPS_2 FLOAT Array[9]

 FLUX FLOAT Array[9]

 ERR_TOT FLOAT Array[9]

 ERR_MEAS FLOAT Array[9]

 CURRENT FLOAT Array[9]

 XPS_SF STRUCT -> Array[1]

NetCDF file attributes for day 2002039

GLOBAL:

    Title = SEE Level 3 Final Data Product - merged daily XPS and EGS data

    Source = SEE POC at LASP / CU

    Mission = TIMED

    Data_product_type = SEE Level 3

    Data_product_version = 011

    Data_product_revision = 01

    Product_format_version = 010

    Software_version = 11.01

    Software_name = write_netCDF.pro called from see_level3_main.pro

    Calibration_version = 09.01

    Description = Calibrated SEE EGS and XPS science data averaged over a day at
      1nm intervals

    History = 10/08/02 Don Woodraska Added product_format_version.

    Filename =
      /titus/timed/testing/data/science_dp/level3/see_L3_2002039_011_01.ncdf

    Date_generated = Wed Sep 12 05:01:12 2012

DATE:

    Units = YYYY-DOY

    Description = Date of observation

EGS_DEGRADE_MODEL:

    Units = None

    Description = Long value is 1 if degradation function is linearly extrapolated,
      0 if linearly interpolated

XPS_DEGRADE_MODEL:

    Units = None

    Description = Long value is 1 if degradation function is linearly extrapolated,
      0 if linearly interpolated

COR_1AU:

    Units = 1 / (AU^2)

    Description = AU correction factor for date

SP.WAVE:

    Units = nm

    Description = 1nm bins at center of wavelength bin (half-integral)

SP.FLUX:

    Units = W / m^2 / nm

    Description = Merged Solar irradiance for XPS and EGS flux at 1nm bins with
      gaps filled using Woods-Rottman 2002 VUV model. Below 26 nm, flux is result of
      solution of linear equations involving XPS diodes and scaled to the VUV model.
      EGS data is used above 26 nm except 114.5-120.5 and 122.5-128.5 nm where the VUV
      model is scaled to the EGS Lyman-alpha line.

SP.ERR_TOT:

    Units = Fractional

    Description = Accuracy of solar irradiance

SP.ERR_MEAS:

    Units = Fractional

    Description = Measurement precision

LINE.WAVE:

    Units = nm

    Description = Reference wavelengths for spectral lines

LINE.FLUX:

    Units = W / m^2

    Description = Integrated spectral line irradiance

LINE.ERR_TOT:

    Units = Fractional

    Description = Accuracy of spectral line irradiance

LINE.ERR_MEAS:

    Units = Fractional

    Description = Measurement precision of spectral line irradiance

LINE.NAME:

    Units = None

    Description = Text indicating the largest contribution to spectral line

LINE.LOGT:

    Units = None

    Description = Logarithm of Temperature for spectral line

XPS.WAVE_XPS_1:

    Units = nm

    Description = Lower limit for XPS diode bandpass filter

XPS.WAVE_XPS_2:

    Units = nm

    Description = Upper limit for XPS diode bandpass filter

XPS.FLUX:

    Units = W / m^2

    Description = Daily median flux for the diode (Level 2)

XPS.ERR_TOT:

    Units = Fractional

    Description = Accuracy of XPS level 2 irradiance

XPS.ERR_MEAS:

    Units = Fractional

    Description = Measured uncertainty in XPS level 2 irradiance

XPS.CURRENT:

    Units = nanoAmps

    Description = Median of Total-Dark-Visible currents from level 1 with FOV
      and 1-AU corrections

XPS.XPS_SF.QS:

    Units = None

    Description = Scalefactor from XPS Level 4 model for daily Quiet Sun
      component

XPS.XPS_SF.AR:

    Units = Nanometers

    Description = Scalefactor from XPS Level 4 model for daily Active Region
      component

XPS.XPS_SF.FLARE:

    Units = Fractional

    Description = Scalefactor from XPS Level 4 model for flare component