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| Notes on '''hmi.ME_720s_e15w1332''' ([http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.ME_720s_e15w1332 click here]) and '''hmi.ME_720s_e15w1332_HARP''' ([http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.ME_720s_e15w1332_HARP click here]) |
== Release notes for Milne Eddington Inversion of HMI Magnetic Field Data (VFISV) == '''hmi.ME_720s_e15w1332''' ([http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.ME_720s_e15w1332 click here for data]) and '''hmi.ME_720s_e15w1332_HARP''' ([http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.ME_720s_e15w1332_HARP click here for data]) |
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| These two series contain all ME inversion data processed by means of VFISV ([http://hmi.stanford.edu/doc/magnetic/section4.pdf details]) of the version that we think is best as of now. | These two data series contain ME inversion data processed using VFISV ([http://hmi.stanford.edu/doc/magnetic/section4.pdf details]) using the codes implemented through 27 November, 2011. This is the best release version as of February 27, 2012. . The prime data products are field strength, inclination, and azimuth. . No disambiguation has been performed, so azimuths are in the range 0-180, not 0-360. |
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| Our efforts on optimizing the VFISV in the HMI data pipeline are on going, and | Our efforts to optimize the VFISV for the HMI data pipeline are on going, and |
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| We will announce the release of the new data through the Solar News. | We will announce the release of the new data through Solar News. |
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| * temporal '''coverage chart''' of these two series : Charts in [http://jsoc.stanford.edu/doc/data/hmi/coverage_maps/inversion/ this directory] show the 12-minute time slots for which the ME inversion data processed with the VFISV module are available or not at these series. The coverage chart also contain the status flags of the HMI observation thus the quality and availability of input Stokes data. See [:ME720se15w1332CoverChart: details of the coverage charts]. | ==== Temporal ''coverage charts'' for these two series ==== Charts in [http://jsoc.stanford.edu/doc/data/hmi/coverage_maps/inversion/ this directory] show the 12-minute time slots for which the ME inversion data processed with the VFISV module are available. The coverage charts also contain the status flags of the HMI observation, thus the quality and availability of input [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.S_720s Stokes] data. See [:ME720se15w1332CoverChart: details] for an explanation of the coverage charts. |
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| * '''hmi.ME720s_e15w1332''' : For ''full-disk''. Synoptic data, on 2 per day basis at 7 and 19UT daily, are stored in this series. The latest version (Oct. 14, 2011) of VFISV is used to process the full-disk input Stokes data mainly since October 1st, 2011. The latest version of VFISV is being used by the current near-real-time run that is filling this series using the latest definitive Stokes data, on the 2 per day basis, usually a week after the observation. An older version (May 26, 2011) was used to process the Stokes data from May 2010 to September 2011, however, the latest version was used to process data for some of this 17-month period. Checking the version of VFISV codes is strongly recommended. | * '''hmi.ME720s_e15w1332 - ''Full Disk'' ''' . Synoptic data, on twice per day basis at 7 and 19UT daily, are stored in this series. The latest (Oct. 14, 2011 or later) version of VFISV was used to process the full-disk data since October 1st, 2011. The latest version of VFISV is being used to extend this series using the latest definitive Stokes data, on the 2 per day basis, usually about a week after the observation. An older version (May 26, 2011) was used to process most of the Stokes data from May 2010 to September 2011, however, the latest version was used to process some data this 17-month period. Data for scattered additional time periods are also available. Differences between the versions are described below. Checking the version of VFISV codes is strongly recommended. |
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| * '''hmi.ME720s_e15w1332_HARP''' : For ''active region(s)''. The latest version (Oct. 14, 2011) of VFISV is used to generate the ME data stored in this series. Many of the active regions processed are recognized automatically by [:HARPDataSeries:HARP module], while some are determined in different ways. This series covers many of the ARs that created the X-class flares in 2011, including the one occurring on 2011 February 15 (at NOAA AR11158), with the 12 minutes (720 seconds) cadence. The ME data stored at this series were used for preparing [:ReleaseNotes:the test data release] of the 3-component disambiguated vector data for the AR 11158. | * '''hmi.ME720s_e15w1332_HARP - ''HMI Active Region Patches'' ''' . The latest version (Oct. 14, 2011) of VFISV has been used to generate the ME data stored in this series. Many of the active regions were recognized automatically by the [:HARPDataSeries:HARP module], while some were defined manually. This series includes 12-minute (720s) cadence data for several of the ARs that created X-class flares in 2011, including the one occurring on 2011 February 15 (at NOAA AR11158). The ME data stored at this series were used for preparing [:ReleaseNotes:the test data release] of the 3-component disambiguated vector data for the AR 11158. |
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| * '''version of VFISV''' in the FITS files exported at JSOC database. * Stored as a string value of a keyword ''INVCODEV'', or a header card of the FITS file. * On IDL, for example, the exported data will be read with [http://hmi.stanford.edu/doc/magnetic/fitsio.pdf fitsio_read_image()] then, the version will be printed with sxpar(), {{{ |
==== Versions of VFISV in the FITS files exported at JSOC database ==== * The VFISV version is stored as a string value in the keyword ''INVCODEV''. * The ME data for the two series were processed with one of three versions, labeled with a date, "May 26, 2011", "Oct 14, 2011" or "Nov 27, 2011". * On IDL, for example, if the exported data is read with [http://hmi.stanford.edu/doc/magnetic/fitsio.pdf fitsio_read_image()] then, the version can be printed with sxpar(), {{{ |
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| * The ME data at the two series were processed with one of three versions, labeled with a date, "May 26, 2011", "Oct 14, 2011" or "Nov 27, 2011". * '''differences between 2011-May-26 version and 2011-October-14 version''' |
* '''Differences between 2011-May-26 version and 2011-October-14 version''' |
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| 1. The 32-bit quality flag for each pixel (segment name : qual_map) had been redefined. This change is adjustable without rerunning VFISV, thus, the published data at the two series have the quality flag map given with the latest definition. * '''differences between 2011-October-14 version and 2011-November-27 version''' * The changes were limited to the part of JSOC data interface and MPI parallelism thus did never affect the output data values. |
1. The 32-bit quality flag for each pixel (segment name : qual_map) was redefined. This change is adjustable without rerunning VFISV, thus, the published data at the two series have the quality flag map given with the latest definition. * '''Differences between 2011-October-14 version and 2011-November-27 version''' * The changes were limited to the JSOC data interface and MPI parallelism, and thus did not affect the output data values. |
Release notes for Milne Eddington Inversion of HMI Magnetic Field Data (VFISV)
hmi.ME_720s_e15w1332 ([http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.ME_720s_e15w1332 click here for data]) and hmi.ME_720s_e15w1332_HARP ([http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.ME_720s_e15w1332_HARP click here for data])
These two data series contain ME inversion data processed using VFISV ([http://hmi.stanford.edu/doc/magnetic/section4.pdf details]) using the codes implemented through 27 November, 2011. This is the best release version as of February 27, 2012.
- The prime data products are field strength, inclination, and azimuth.
- No disambiguation has been performed, so azimuths are in the range 0-180, not 0-360.
Our efforts to optimize the VFISV for the HMI data pipeline are on going, and we will create the series to fill the data processed by the newer codes when ready. We will announce the release of the new data through Solar News.
Temporal ''coverage charts'' for these two series
Charts in [http://jsoc.stanford.edu/doc/data/hmi/coverage_maps/inversion/ this directory] show the 12-minute time slots for which the ME inversion data processed with the VFISV module are available. The coverage charts also contain the status flags of the HMI observation, thus the quality and availability of input [http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.S_720s Stokes] data. See [:ME720se15w1332CoverChart: details] for an explanation of the coverage charts.
hmi.ME720s_e15w1332 - Full Disk
- Synoptic data, on twice per day basis at 7 and 19UT daily, are stored in this series. The latest (Oct. 14, 2011 or later) version of VFISV was used to process the full-disk data since October 1st, 2011. The latest version of VFISV is being used to extend this series using the latest definitive Stokes data, on the 2 per day basis, usually about a week after the observation. An older version (May 26, 2011) was used to process most of the Stokes data from May 2010 to September 2011, however, the latest version was used to process some data this 17-month period. Data for scattered additional time periods are also available. Differences between the versions are described below. Checking the version of VFISV codes is strongly recommended.
hmi.ME720s_e15w1332_HARP - HMI Active Region Patches
The latest version (Oct. 14, 2011) of VFISV has been used to generate the ME data stored in this series. Many of the active regions were recognized automatically by the [:HARPDataSeries:HARP module], while some were defined manually. This series includes 12-minute (720s) cadence data for several of the ARs that created X-class flares in 2011, including the one occurring on 2011 February 15 (at NOAA AR11158). The ME data stored at this series were used for preparing [:ReleaseNotes:the test data release] of the 3-component disambiguated vector data for the AR 11158.
Versions of VFISV in the FITS files exported at JSOC database
The VFISV version is stored as a string value in the keyword INVCODEV.
- The ME data for the two series were processed with one of three versions, labeled with a date, "May 26, 2011", "Oct 14, 2011" or "Nov 27, 2011".
On IDL, for example, if the exported data is read with [http://hmi.stanford.edu/doc/magnetic/fitsio.pdf fitsio_read_image()] then, the version can be printed with sxpar(),
IDL> img=fitsio_read_image('img.fits',header) IDL> print, sxpar(header,'INVCODEV')
Differences between 2011-May-26 version and 2011-October-14 version
- VFISV core part
- Some of initial guess values for the iterative residual minimization were changed.
- Derivatives of residual square-chi is calculated with the best-fitting parameters instead of those at the last iteration stage.
- Other change in the JSOC context
- The 32-bit quality flag for each pixel (segment name : qual_map) was redefined. This change is adjustable without rerunning VFISV, thus, the published data at the two series have the quality flag map given with the latest definition.
- VFISV core part
Differences between 2011-October-14 version and 2011-November-27 version
- The changes were limited to the JSOC data interface and MPI parallelism, and thus did not affect the output data values.