Difference: SpireCalibrationWeb (109 vs. 110)

Revision 1102014-03-17 - IvanV

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META TOPICPARENT name="WebHome"

SPIRE instrument and calibration web pages

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SPIRE Calibration Tree Applicable HIPE Version Comment
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SPIRE_CAL_11_0 HIPE v11 Calibration tree currently used in operations
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SPIRE_CAL_12_2 HIPE v12 Calibration tree currently used in operations
SPIRE_CAL_11_0 HIPE v11 Final v11 cal tree
 
SPIRE_CAL_10_1 HIPE v10 Final v10 cal tree
SPIRE_CAL_9_1 HIPE v9 Final v9 cal tree
SPIRE_CAL_8_1 HIPE v8 Final v8 cal tree
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  More details of the changes in each version are given here.
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  • Any of the calibration trees can be retrieved in HIPE from the HSA using (e.g.) cal = spireCal(calTree="spire_cal_11_0") etc. The default (applicable to the HIPE version in use) can be obtained with cal = spireCal(calTree="spire_cal"). It can then be saved to a local pool right-clicking on the cal variable and then selecting from the context menu Send To -> Local Pool.
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  • Any of the calibration trees can be retrieved in HIPE from the HSA using (e.g.) cal = spireCal(calTree="spire_cal_12_2") etc. The default (applicable to the HIPE version in use) can be obtained with cal = spireCal(calTree="spire_cal"). It can then be saved to a local pool right-clicking on the cal variable and then selecting from the context menu Send To -> Local Pool.
 
  • Alternatively, the latest calibration tree for SPIRE can be obtained as a jar file from Latest calibration trees. Then, you have to possibilities to read and save:
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    1. The jar file can be load directly into HIPE with the command: cal = spireCal(jarFile="PATH_TO_FILE/spire_cal_11_0.jar"). To save it to a local pool, proceed as described above, right-clicking on the cal variable and then selecting from the context menu Send To -> Local Pool.
    2. The jar file can also be saved directly to a local pool without opening HIPE, running the following command in the terminal command line: cal_import PATH_TO_FILE/spire_cal_11_0.jar. Then, to load the calibration tree in HIPE, simply type: cal = spireCal(pool="spire_cal_11_0")
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    1. The jar file can be load directly into HIPE with the command: cal = spireCal(jarFile="PATH_TO_FILE/spire_cal_12_2.jar"). To save it to a local pool, proceed as described above, right-clicking on the cal variable and then selecting from the context menu Send To -> Local Pool.
    2. The jar file can also be saved directly to a local pool without opening HIPE, running the following command in the terminal command line: cal_import PATH_TO_FILE/spire_cal_12_2.jar. Then, to load the calibration tree in HIPE, simply type: cal = spireCal(pool="spire_cal_12_2")
 
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See the SPIRE Data Reduction Guide for more details.
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See the SPIRE Data Reduction Guide for more details.
 

SPIRE calibration and performance

Photometer calibration

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  • SPIRE Photometer Calibration:
    Full details of the SPIRE calibration can be found in the SPIRE Observers Manual and in dedicated publications: the calibration scheme is described in Griffin et al. (2013) and the implementation using Neptune as the primary calibration standard, is described in Bendo et al. (2013).
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  • SPIRE Photometer Calibration:
    Full details of the SPIRE calibration can be found in the SPIRE Observers Manual and in dedicated publications: the calibration scheme is described in Griffin et al. (2013) and the implementation using Neptune as the primary calibration standard, is described in Bendo et al. (2013).
 
    • Calibration uncertainties, which should be included in addition to the statistical errors of any measurement, are as follows:
      • ▒ 4% absolute from Neptune model (this uncertainty is systematic and correlated across the three bands)
      • ▒ 1.5% (random) from Neptune photometry
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  • SPIRE Photometer Beams:
    • These are available in the SPIRE calibration context, at the standard map pixel size of (6,10,14) arcsec/pixel for (250,350,500) Ám bands, and can be accessed in HIPE after a calibration context has been loaded (see above).
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<--      * Tip, idea The observed beams at much finer scale of 1 arcsec/pixel, as well as the theoretical ones, are available from here . Please read the release note for more details. -->
 
    • NEW A new more detailed analysis of the SPIRE beam profile data was undertaken in 2012, leading to revised values for beam profile solid angles and derivation of a semi empirical wavelength dependent beam profile model. The results at a scale of 1 arcsec/pixel as well as the data needed for the model are available for download. A detailed description of the analysis is given as well.
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<--      * Tip, idea The observed beams at much finer scale of 1 arcsec/pixel, as well as the theoretical ones, are available from here . Please read the release note for more details. -->
 
  • SPIRE Photometer filter transmission curves:
    • These are also available in the SPIRE calibration context (photRsrf) and can be accessed in HIPE after a calibration context has been loaded (See above).
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Spectrometer calibration

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    • Calibration uncertainties, which should be included in addition to the statistical errors of any measurement from HIPE v11 onwards, are as follows:
      • Point sources observed on the centre detectors (SSWD4 and SLWC3): the measured repeatability is 6%, with the following contributions: (i) absolute systematic uncertainty in the models from comparison of Uranus and Neptune - determined to be ▒3%; (i) the statistical repeatability determined from observations of Uranus and Neptune, with pointing corrected - estimated at ▒1% (excluding the edges of the bands); (iii) the uncertainties in the instrument and telescope model, which lead to an additive continuum offset error of 0.4 Jy for SLW and 0.3 Jy for SSW and (iv) the effect of the Herschel APE.
      • Sparse observations of significantly extended sources:
 
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