Difference: HifiCalibrationWeb (68 vs. 69)

Revision 692014-07-02 - CarolynMcCoey

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META TOPICPARENT name="WebHome"

HIFI instrument and calibration web pages

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NEW NEW NEW Latest updates -- 18 March 2014 NEW NEW NEW
  • HIPE 12.0 has been released !
  • A new task for Electrical Standing Wave correction is available in HIPE 12.0 - see the "Outstanding calibration issues" section
  • Cookbooks are now available for each HIFI observing mode - see the "Documentation and Cookbooks" section
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NEW NEW NEW Latest updates -- 2 July 2014 NEW NEW NEW
  • HIPE 12.1 has been released !
  • A revision of the HIFI beam analysis and efficiencies is available - see the "HIFI performance and calibration" section
  • A new task for Electrical Standing Wave correction is available from HIPE 12.0 - see the "Outstanding calibration issues" section
 

Observing with HIFI

  • Useful Documentation
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  • HIFI calibration data
    • A significant number of the data taken by HIFI in the framework of the Performance Validation (PV) and routine phase are now publicly available. There are particular caveats that apply to those data. They are described in this disclaimer note
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Reducing HIFI data

Recommended User release

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  Mac OS X and Java 7 Issues : please consult the HIPE Known Issues page regarding important information on issues with Java for different versions of HIPE.
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Which data would most benefit from being reprocessed in HIPE 12.0?

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Which data would most benefit from being reprocessed in HIPE 12.1?

  If your data have been processed with the latest bulk reprocessing (11.1):

  • Rotated maps
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    • Rotated cubes are now produced in the Level 2.5 product by default for maps carried out with a non-zero position angle, a non-rotated cube is also produced. BEWARE however that a bug was introduced in HIPE 12.0 whereby non-rotated cubes are not properly created if option flyAngle=0 is selected. You can temporarily work this around by specifying e.g. flyAngle=1e-5 (i.e. a very small, non-zero, rotation). This will be fixed in HIPE 12.1.
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    • Rotated cubes are now produced in the Level 2.5 product by default for maps carried out with a non-zero position angle, a non-rotated cube is also produced.
 
  • Solar System Object ephemerides
    • A bug (see here) was fixed in the calculation of SSO ephemeris positions (ra_centre/dec_centre) that led to offsets of up to ~10". This bug affected users that use cubes in a co-moving frame (including the standard level 2.5 cubes), use the doOffset task, or make explicit use of ra_centre / dec_centre in their HIPE scripts. The offset is practically constant over a map and could, e.g., make the emission of a comet appear to be off-center when it really isn't. The fixed bug is in the level 0 pipeline, which users cannot run easily. The issue is fixed by the HIPE 11.1 bulk reprocessing.
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  • See the What's New page for more details of improvements in HIPE 12.0
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  • See the What's New page for more details of improvements in HIPE 12.1
 

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Documentation and Cookbooks

  • The HIFI Launch Pad is intended to help you quickly off the ground with HIFI data reduction
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  • Intensity calibration: Intensity Calibration Framework document
  • Side band ratio
    • Side band ratio technical note: This note describes the general calibration problem associated with the side-band gain imbalance existing in double-side-band heterodyne systems such as HIFI, and provides some recipes and calibration tables applicable to the particular case of the HIFI mixers.
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  • Beam calibration
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  • Beam calibration ( see also HIFI beam sub-section thereafter )
 
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  • WBS accuracy: COMB algorithm and interpolation interval
  • WBS resolution: optical alignment & thermal expansion effects within spectrometer
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HIFI beams

HIFI beam coupling efficiencies

A revision of the HIFI beam analysis has been performed, based on a multi-epoch set of measurements on Mars. As a result, a more accurate description of the HIFI beams has been obtained, leading to some change in the beam coupling efficiencies. The details of the analysis and the revised coupling efficiencies are given in this note. For the record, the first release of the HIFI beam efficiencies was described in this document (17 Nov 2010). Please note that these updates will only be featured in the HIFI calibration tree in HIPE 13.0.

HIFI beam maps and Encircled Energy Function

In addition to this, a detailed description of the HIFI beam models is provided as 2-D beam maps, 1-D azimuthal beam averages, and 1-D azimuthally averaged Encircled Energy Functions (EEF). Each are provided at one frequency per mixer band and can be extrapolated (within the LO frequencies of a given band) as function of wavelength.

  • EEF plots as ascii and PNG files (one per mixer band and polarization - 14 in total).
  • 1-D beam model profiles as FITS files (one per mixer band and polarization - 14 in total).
  • 2-D beam model maps as FITS files (200x200 pixels, one per mixer band and polarization - 14 in total).
 

Access to the calibration tree:

  • Information about what calibration is found in the HIFI ObservationContext is found in the Data Primer of the HIFI Data Reduction Guide

  • Information about how to find what calibration version was used on your data, how to get the latest calibration and reprocess observations with it is found in the Pipeline chapter of the HIFI Data reduction Guide
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  • the latest calibration tree pool can be also retrieved directly here (18 March 2014)
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  • the latest calibration tree pool can be also retrieved directly here (2 July 2014)
 
  • Updates to the HIFI calibration data are generally concurrent with the release of each major version of the HCSS-HIFI software. However, it is possible to have updates to the calibration data in between major releases of the software as the software and data are independent of each other, in the table below the HIPE or the OD from which the calibration updates apply are given. The calibration versions available since HIPE 5 are listed in the table below
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13_0 30-05-13   11.0 Update of the list of corrupted data-frames for flagging at Level 0, updates to spur table to account for band 3B purification
14_0 04-07-13   11.0 Update of the list of corrupted data-frames for flagging at Level 0
15_0 18-03-14   12.0 Update of the list of corrupted data-frames for flagging at Level 0, ingestion of the Electrical Standing Wave correction reference table
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18_0 02-07-14   12.1 Update of the list of corrupted data-frames for flagging at Level 0, Absolute Pointing Error (APE) added to allow a quality flag to be raised if the pointing outside of expected range during ODs 320-761, updates to allow IF-dependent corrections to side band ratio, update to spur tables allow entry of spurs found by the ICC or a Key Programme, addition of instrument uncertainty
 
  • The side-band ratio assumed in the pipeline as of the latest calibration tree pool are illustrated in this plot.
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-- DavidTeyssier , CarolynMcCoey and SylvieFBeaulieu - 26 March 2014
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-- DavidTeyssier , CarolynMcCoey and SylvieFBeaulieu - 2 July 2014
 
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