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Level 3 FITS file : Extension 0 (Results)
Martin Wiesmann edited this page Feb 7, 2024
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- Level 3 FITS file
- Extension 0 - Results (Fit components and parameters)
- Extension 1 - Data
- Extension 2 - Lambda
- Extension 3 - Weights
- Extension 4 - Includes
- Extension 5 - Constants
- Extension X - Residuals
An example of a level 3 FITS file can be found here
This extension contains the results of the fit, performed by CFIT_BLOCK. Each parameter for each fit component is given for each pixel, where the dimensions are as follows:
- Raster: Fit-parameters + Chi^2, X, Y
- Sit-and_stare: Fit-parameters + Chi^2, X, Y, Time (where NAXIS2 = 1)
Fit parameters include the Chi-squared parameter as the last parameter.
SOLARNET = Fully/Partially/No SOLARNET compliant (1/0.5/-1)
OBS_HDU = HDU contains (no) observational data or SOLARNET Type P data (0/1/2)
EXTNAME = Extension name
FILENAME = Filename
PGFILENA = Progenitor filename
PARENT = Parent filename
PGEXTNAM = Extension name in progenitor file
RESEXT = Extension name of results extension
DATAEXT = Extension name of data extension (this is a link to an external extension)
XDIMXT1 = Extension name of 1st dimension absorbed by analysis
WGTSEXT = Extension name of weights extension
INCLEXT = Extension name of include extension
CONSTEXT = Extension name of constant extension
NXDIM = Number of dimensions absorbed by analysis process
XDIMTY1 = CTYPE of 1st dimension absorbed by analysis
NWIN = Number of windows in level 3 file
WINNO = Window number (starting at 0) within this study in this level 3 file
LEVEL = Data processing level
VERSION = File version number
DATE-BEG = Beginning of data acquisition
INSTRUME = Instrument name
OBSRVTRY = Observatory name
CREATOR = Name of creator
ANA_NCMP = Number of fit components, Min=1, Max=99
CMPTYPnn = Type of Fit component nn ('Polynomial', 'Gaussian', 'SSW comp_bgauss', 'SSW comp_voigt')
CMPNAMnn = Name of component nn
CMPSTRnn = Function string of component nn
CMPDESnn = Description of component nn
CMPMULnn = Indicates whether component nn is multiplicative
CMPINCnn = Indicates whether component nn is included in the fit
CMP_NPnn = Number of parameters for component nn ((n+1) for polynomials of order n, 3 for Gauss, 5 for broadened gauss, 4 for Voigt gauss, 1 for Chi-squared), Min 0, Max 27 ([ ,a,b...,z]).
PNAMEnna = Name of parameter a (letter) for component nn
PUNITnna = Physical unit of parameter a (letter) for component nn
PDESCnna = Description of parameter a (letter) for component nn
PINITnna = Initial value of parameter a (letter) for component nn
PVALnna = Value of parameter a (letter) for component nn
PMAXnna = Maximum value of parameter a (letter) for component nn
PMINnna = Minimum value of parameter a (letter) for component nn
PTRNAnna = Linear transformation coefficient A of parameter a (letter) for component nn in (e.g, Lambda = PRVALnna * PRTRAnna + PRTRBnna)
PTRNBnna = Linear transformation coefficient B of parameter a (letter) for component nn in (e.g, Lambda = PRVALnna * PRTRAnna + PRTRBnna)
PCONSnna = Indicates whether parameter a (letter) for component nn is constant
WCSNAME = Name of coordinate system
LONPOLE = Native longitude of the celestial pole
SPECSYS = Spectral coord. not corrected for S/C velocity
VELOSYS = [m/s] Default for SPECSYS='TOPOCENT'
CTYPE1 = Type of 1st coordinate (fit parameter)
CNAME1 = Name of 1st coordinate
CUNIT1 = Units for 1st coordinate (for CRVAL1, CDELT1)
CRVAL1 = [] 1st coordinate of reference point
CDELT1 = [] Increment of 1st coord at ref point
CRPIX1 = [pixel] 1st pixel index of reference point
PC1_1 = Contribution of dim 1 to coord 1
CTYPE2 = Type of 2nd coordinate
CNAME2 = Name of 2nd coordinate
CUNIT2 = Units for 2nd coordinate (for CRVAL2, CDELT2)
CRVAL2 = [arcsec] 2nd coordinate of reference point
CDELT2 = [arcsec] Increment of 2nd coord at ref point
CRPIX2 = [pixel] 2nd pixel index of reference point
PC2_2 = Contribution of dim 2 to coord 2
PC2_3 = Contribution of dim 3 to coord 2
CTYPE3 = Type of 3rd coordinate
CNAME3 = Name of 3rd coordinate
CUNIT3 = Units for 3rd coordinate (for CRVAL3, CDELT3)
CRVAL3 = [arcsec] 3rd coordinate of reference point
CDELT3 = [arcsec] Increment of 3rd coord at ref point
CRPIX3 = [pixel] 3rd pixel index of reference point
PC3_2 = Contribution of dim 2 to coord 3 due to roll
PC3_3 = Contribution of dim 3 to coord 3
CTYPE4 = Type of 4th coordinate
CNAME4 = Description of 4th coordinate
CUNIT4 = Units for 4th coordinate (for CRVAL4, CDELT4)
CRVAL4 = [s] 4th coord of ref point, relative to DATEREF
CDELT4 = [s] Increment of 4th coord at ref point
CRPIX4 = [pixel] 4th pixel index of reference point
PC4_2 = Contribution of dim 2 to coord 4 due to roll ; _optional, only for rasters_
PC4_4 = Contribution of dim 4 to coord 4
BTYPE = Type of data
UCD = Unified Content Descriptors v1.23
BUNIT = Physical units of calibrated data
All processing steps up to level 2 are included in this header. Additionally, at least two more processing steps are added during the creation of the level 3 file. E.g.:
PRSTEP11 = 'PEAK-FINDING' / Processing step type, step 11
PRPROC11 = 'spice_gt_peaks' / Name of procedure performing PRSTEP11
PRPVER11 = 1 / Version of procedure PRPROC11
PRLIB11 = 'solarsoft/so/spice/idl/quicklook' / Software library containing PRPR
PRSTEP12 = 'LINE-FITTING' / Processing step type, step 12
PRPROC12 = 'spice_data::create_l3_file' / Name of procedure performing PRSTEP12
PRPVER12 = 8 / Version of procedure PRPROC12
PRLIB12 = 'solarsoft/so/spice/idl/quicklook' / Software library containing PRPR
PRPARA12 = 'LINE_LIST = 0, &'
CONTINUE 'MASKING = 1, &'
CONTINUE 'FITTING = 1, &'
CONTINUE 'POSITION = 0, &'
CONTINUE 'VELOCITY = -999, &'
CONTINUE 'POSSIBLE_MANUAL_EDITING = 0' / Parameters for PRPROC12
The history up to level 2 is included in this header. Additionally, the history of the creation of this level 3 file is added. This includes a list of functions that were called to create the level 3 file. E.g.:
HISTORY ANA: > SPICE_CREATE_L3_DRIVER > SPICE_DATA::CREATE_L3_FILE