• ME720se15w1332

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])

These two series contain all ME inversion data processed by means of VFISV of the version that we think is best as of February 23, 2012.

Be adviced that the data are yet preliminary: Our efforts on optimizing the VFISV algorithm to HMI data is going on, and we will create the series to fill the data processed by the newer codes when we think they are ready. We will announce the new data release through the Solar News.

• coverage chart of these two series : The website provides (to be pointed here) the coverage chart of these two series.

• hmi.ME720s_e15w1332 : For full-disk. Typically on 2 per day basis, at 7 and 19UT evryday. The latest version (Oct. 14, 2011) of VFISV is used to process mainly the data since October 1st, 2011. The latest version of VFISV is being used by the current near-real-time runs that is filling this series with the new definitive Stokes data, on the 2 per day basis, usually a week behind. An older version (May 26, 2011) was used to process the data from May 2010 to September 2011, however, the latest version was used to process some of this period. Checking the version of VFISV codes is strongly recommended.

• hmi.ME720s_e15w1332_HARP : For active region(s). The latest version (Oct. 14, 2011) of VFISV is used to process the data stored in this series. Many of the active regions processed are recognized by [:HARPDataSeries:HARP module], while some are defined in different ways. This series covers many of the ARs that created the X-flare in 2011, including the X-class flare on 2011 February 15. The ME data stored at this series were used for preparing the test data release of the 3-component disambiguated vector data of the 2011-February X-flare region.

• version of VFISV in the FITS files exported at JSOC database.

  • Stored as a string of keyword INVCODEV.

  • On IDL, the version will be printed by, for example,

    IDL> img=fitsio_read_image('img.fits',header)
    IDL> print, sxpar(header,'INVCODEV')

  • The ME data at the two series were processed with one of three versions, labeled with either date of May 26, 2011, Oct 14, 2011 or Nov 27, 2011.

• differences between May 26 version and October 14 version

  • VFISV core part
    1. Some of initial guess values for the iterative residual minimization were changed.
    2. Derivatives of residual square-chi is calculated at the best-fitting parameters instead of those at the last iteration stage.
  • Other change in the JSOC context
    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 October 14 version and November 27 version

  • The changes were limited to the part of JSOC data interface and MPI parallelism thus did not affect the output data.