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Level 3: averaged data

Level 3 data correspond to level 2 data averaged to the minute. The same warning applies concerning the Lyman alpha and Herzberg channels of the nominal unit (unit2).

They consist in daily fits files, updated after each contact with the spacecraft. They contain a primary header and a secondary header (described below), followed by the binary table of data.

fits keywords for lev3 Lyra product: primary header
KEYWORD EXAMPLE OF VALUE COMMENT
SIMPLE T Written by IDL: Tue Feb 15 09:27:46 2011
BITPIX 8  
NAXIS 0  
EXTEND T File contains extensions
ORIGIN ’ROB-SIDC’  
TELESCOP ’PROBA2 ’  
INSTRUME ’LYRA ’  
OBJECT ’EUV solar irrad’  
OBS_MODE ’standard’ science data
DATE ’2011-02-15’  
DATE_OBS ’2010-05-01T00:00:00.004000’ UTC start of observation
DATE_END ’2010-05-01T21:41:22.150995’ UTC end of observation
DEL_TIME 60 one-minute averages
DATASRC ’Redu ’ receiving ground station
LEVEL ’3 ’ calibration level
ALGOR_V ’EDG=2.1 BSDG=0.5’ LYRA calibration S/W version
FILENAME ’lyra_20100501-000000_lev3_std.fits’ name of this FITS file
END    
fits keywords for lev3 Lyra product: secondary header
KEYWORD EXAMPLE OF VALUE COMMENT
XTENSION ’BINTABLE’ Written by IDL: Tue Feb 15 09:27:46 2011
BITPIX 8  
NAXIS 2 Binary table
NAXIS1 39 Number of bytes per row
NAXIS2 1302 Number of rows
PCOUNT 0 Random parameter count
GCOUNT 1 Group count
TFIELDS 6 Number of columns
EXTNAME ’IRRAD LEVEL 3’ name of binary table extension
TFORM1 ’1I ’ Integer*2 (short integer)
TTYPE1 ’TIME ’ Label for column 1
TUNIT1 ’MIN ’ Units of column 1
TFORM2 ’1D ’ Real*8 (double precision)
TTYPE2 ’CHANNEL1’ Label for column 2
TUNIT2 ’W/m**2 ’ Units of column 2
TFORM3 ’1D ’ Real*8 (double precision)
TTYPE3 ’CHANNEL2’ Label for column 3
TUNIT3 ’W/m**2 ’ Units of column 3
TFORM4 ’1D ’ Real*8 (double precision)
TTYPE4 ’CHANNEL3’ Label for column 4
TUNIT4 ’W/m**2 ’ Units of column 4
TFORM5 ’1D ’ Real*8 (double precision)
TTYPE5 ’CHANNEL4’ Label for column 5
TUNIT5 ’W/m**2 ’ Units of column 5
TFORM6 ’5A ’ Character string
TTYPE6 ’WARNING ’ Label for column 6
TUNIT6 ’ ’ Units of column 6
END    

Then follows the binary table containing the data, which consists in 6 columns: the time, the irradiance in the four channels, and an index describing the quality of the calibration and time interpolation on the data.